Java is a versatile, object-oriented programming language that is widely used for software development across various industries. Java Developers can help clients create anything from complex web applications to automated trading bots and mobile apps. With their advanced skills and knowledge, they can turn your vision into reality, providing you with tailored solutions that align with your business goals. Here are some recent projects that our expert Java Developers made real:

  • Developing custom GUIs for existing codebases
  • Creating encrypted, secure crypto apps
  • Designing cross-platform audio merging tools for mobile devices
  • Building sophisticated trading bots for the cryptocurrency market
  • Implementing open-source virtual machines in C
  • Collaborating as senior developers on large-scale Android projects
  • Solving server request errors for mobile applications
  • Running and optimizing code from Git repositories
  • Designing and implementing web services for seamless integration

Hiring Java Developers on Freelancer.com gives you access to a global pool of talented professionals who can deliver high-quality solutions tailored to your needs. Our platform makes it easy and convenient to find, hire, and collaborate with skilled Java experts from around the world. So why wait? Bring your ideas to life by posting your own project and hiring a Java Developer on Freelancer.com today!

De 247,763 opiniones, los clientes califican nuestro Java Developers 4.9 de un total de 5 estrellas.
Contratar a Java Developers

Java is a versatile, object-oriented programming language that is widely used for software development across various industries. Java Developers can help clients create anything from complex web applications to automated trading bots and mobile apps. With their advanced skills and knowledge, they can turn your vision into reality, providing you with tailored solutions that align with your business goals. Here are some recent projects that our expert Java Developers made real:

  • Developing custom GUIs for existing codebases
  • Creating encrypted, secure crypto apps
  • Designing cross-platform audio merging tools for mobile devices
  • Building sophisticated trading bots for the cryptocurrency market
  • Implementing open-source virtual machines in C
  • Collaborating as senior developers on large-scale Android projects
  • Solving server request errors for mobile applications
  • Running and optimizing code from Git repositories
  • Designing and implementing web services for seamless integration

Hiring Java Developers on Freelancer.com gives you access to a global pool of talented professionals who can deliver high-quality solutions tailored to your needs. Our platform makes it easy and convenient to find, hire, and collaborate with skilled Java experts from around the world. So why wait? Bring your ideas to life by posting your own project and hiring a Java Developer on Freelancer.com today!

De 247,763 opiniones, los clientes califican nuestro Java Developers 4.9 de un total de 5 estrellas.
Contratar a Java Developers

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    167 trabajos encontrados

    Quiero lanzar una aplicación móvil de tipo red social exclusivamente para Android. Busco a alguien que pueda encargarse del desarrollo completo: desde la configuración inicial del proyecto en Android Studio hasta la creación y conexión de bases de datos, interfaces intuitivas y pruebas en dispositivos reales. Alcance que tengo en mente: • Pantallas de registro/inicio de sesión (correo o Google). • Feed principal con publicaciones de texto, imagen y “me gusta”. • Perfil de usuario editable con foto. • Notificaciones push básicas. • Panel sencillo de administración (puede ser web o Firebase Console) para moderar contenido. Entrego wireframes iniciales y referencia de estilo; espero recibir ...

    $662 Average bid
    $662 Oferta promedio
    66 ofertas

    Descripción del rol Buscamos un Arquitecto Tech Lead Senior Java + Spring Boot con fuerte experiencia en la definición de arquitectura de software. Responsabilidades: 1 Redefinir y liderar la arquitectura híbrida: Hexagonal + DDD + Microservicios. 2 decisiones técnicas críticas. 3 Liderar el desarrollo backend en Java Spring Boot. 4 Debe programar las bases (el esqueleto) del proyecto. NO DEBE TOMAR MUCHO TIEMPO. Requisitos técnicos Obligatorios 1 +10 años de experiencia en desarrollo back-end con Java. 2 Experiencia sólida como Tech Lead o Senior Architect. 3 Dominio de Java 17+ y Spring Boot. 4 Experiencia comprobable en: Microservicios 5 Arquitectura Hexagonal+ DDD 6 Manejo avanzado de PostgreSQL. 7 Uso de Redis (cache, cola...

    $175 Average bid
    $175 Oferta promedio
    30 ofertas
    Software de salón Windows
    1 día left
    Verificado

    Dirijo un salón de belleza y necesito una aplicación de escritorio para Windows que simplifique la gestión diaria. Al teclear el número de teléfono debe mostrarse automáticamente el nombre del cliente (o permitir crearlo si es nuevo), desplegar su historial de servicios y calcular al momento el importe a cobrar según la lista de tratamientos que yo defina. Las funciones clave que requiero son: • Registro de clientes con número de teléfono • Historial detallado de los servicios utilizados en cada visita • Facturación automática con total y desglose de tratamientos La aplicación debe ejecutarse sin conexión, ser ligera, en español y compatible con Windows 10 en adelante. A...

    $165 Average bid
    $165 Oferta promedio
    66 ofertas

    More details: ¿Qué funcionalidad específica necesitas en el keylogger para Android? Monitorizar aplicaciones utilizadas ¿Cómo te gustaría recibir los datos monitoreados? Correo electrónico ¿Te gustaría que el keylogger estuviera oculto o visible en el dispositivo? Oculto

    $483 Average bid
    $483 Oferta promedio
    29 ofertas
    serviexpress
    1 día left

    Quiero lanzar una app empresarial que funcione de forma nativa tanto en iOS como en Android. La funcionalidad central será la contratación de servicios varios dentro de la propia aplicación: el usuario debe poder buscar, seleccionar y cerrar la contratación de un servicio desde su móvil de manera segura y sencilla. Me interesa un flujo limpio de alta de usuario, catálogo filtrable, pasarela de pago integrada y un pequeño panel de análisis que me permita ver las contrataciones en tiempo real. De momento esa es la prioridad, aunque más adelante podríamos valorar incorporar módulos de gestión de proyectos, comunicación interna o seguimiento de ventas. Espero recibir: • APK y archivo IPA listos pa...

    $355 Average bid
    $355 Oferta promedio
    11 ofertas

    The goal is to turn my paper-prototype trading card game—think Magic: The Gathering—into a full, browser-based experience powered by the MERN stack. I already have card concepts and basic rules; what I need now is the code that makes it all come alive. Core scope • React will drive a responsive UI that lets players browse their collection and assemble decks through an intuitive drag-and-drop builder. • A Node + Express backend, backed by MongoDB, will store user accounts, card data, decks, and match history. • Real-time player-vs-player matches should run over WebSockets ( or similar), handling turn flow, card effects, and game-state sync with minimal latency. • Players gain new cards exclusively by trading with one another, so a secure, peer-to-pee...

    $25 / hr Average bid
    $25 / hr Oferta promedio
    85 ofertas

    I'm seeking a talented Minecraft mod developer to create a unique mod that allows players' spears to evolve into better materials as they eliminate opponents. (ex: kill 3 players with iron = copper kill 6 more players to get diamond) Key Requirements: - Spear evolution based on player kills (e.g., stone -> iron -> copper -> diamond -> netherite) - Integration with existing game mechanics - Balance to ensure fair gameplay Ideal Skills: - Experience with Minecraft modding - Proficiency in Java - Strong understanding of Minecraft mechanics and balance Please provide examples of previous work and a brief outline of your approach.

    $21 Average bid
    $21 Oferta promedio
    28 ofertas

    My kids’ book-reading app is already live on Google Play, but its current backend has hit its limits. I now need a complete Spring Boot rebuild that is secure, scalable and easy to maintain. Core requirements • Robust user authentication and role-based authorisation • A flexible content management flow that lets me upload, edit and order stories, poems and chapters without touching code • Built-in analytics and reporting so I can track active readers, session length and popular titles • Full chapter management for every book, including draft → publish states What I expect as final deliverables 1. RESTful Spring Boot API with clean, versioned endpoints 2. A responsive admin panel (your choice of React, Angular, or Thymeleaf) tightly coupled t...

    $91 Average bid
    $91 Oferta promedio
    11 ofertas

    JavaScript API & Automation Specialist (Agencies Only) NOTE: * AGENCIES ONLY * This is a deliberately small, low-risk project. The agency that proves speed, precision, and reliability here will be shortlisted first for larger-scale, ongoing automation projects already queued. I am looking for a professional IT Agency to run a very small and simple batch-automation project. This project involves creating and setting up 400 email accounts across 400 different domains. I already have the JavaScript code created for you; your job is to run the scripts, manage the APIs, and ensure quality control. Project Action Items (Sequence) You will run JavaScript batches to complete the following tasks: 1. Batch Email Creation (MXroute API): Run the script to create 400 email accounts and dom...

    $423 Average bid
    $423 Oferta promedio
    85 ofertas

    Saya ingin membangun sebuah aplikasi media sosial khusus untuk Android. Fokusnya adalah versi pertama yang stabil agar bisa segera diujicoba pengguna awal. Ruang lingkup kerja: • Desain arsitektur aplikasi (frontend + backend ringan). • Fitur inti: daftar akun, login, pembuatan dan penelusuran postingan berupa teks + gambar, komentar, serta notifikasi push. • Antarmuka modern dan bersih mengikuti panduan Material Design. • Bahasa pemrograman bebas—Kotlin atau Java yang umum di Android Studio sama-sama dapat diterima. • Kode sumber terstruktur dengan README singkat berisi cara build dan deploy APK. Saya terbuka pada saran framework back-end (Firebase, Supabase, atau solusi ringan lain) selama time-to-market cepat. Setelah aplikasi dasar berfungsi, ke...

    $561 Average bid
    $561 Oferta promedio
    8 ofertas

    Saya ingin sebuah aplikasi Android berbasis AI yang bertugas sebagai asisten pribadi dengan fokus utama pada fitur “Pengaturan alarm”. Aplikasi harus berjalan mulus di versi Android terbaru, memanfaatkan teknologi machine-learning on-device (misalnya TensorFlow Lite) agar proses berlangsung cepat tanpa bergantung penuh pada server eksternal. Target saya jelas: pengguna cukup membuka aplikasi, mengatur atau mengelola alarm, lalu sistem secara cerdas menyesuaikan pengingat sesuai kebiasaan pengguna (contoh: menyarankan jadwal bangun lebih pagi saat kalender mendeteksi pertemuan penting). Teknis singkat: • Pembangunan dengan Android Studio, memakai Kotlin (Java opsional). • Desain UI sederhana, ringan, dan intuitif sesuai standar Material Design. • Model...

    $25 Average bid
    $25 Oferta promedio
    7 ofertas

    I already have a detailed blueprint that spells out every formula and screen of my personal work app; what I need now is the actual Android build. The sole purpose of the app is to run those calculations locally—no databases, cloud calls, or extra features—then present the results in the layout I have drawn. I’d like the code written in Python so I can extend it later. If you normally package Python for Android with Kivy, Chaquopy, BeeWare, or a similar toolchain, that fits perfectly. Clear, well-commented code and a straightforward build process are important because I’ll be maintaining the project myself after delivery. Deliverables • Install-ready APK that runs on recent Android phones and tablets • Complete, editable source code plus any build sc...

    $271 Average bid
    $271 Oferta promedio
    29 ofertas

    I’m building a straightforward mobile experience where users earn points every time they tap the screen. The job is Android-only, and the focus is on a clean, lightweight build that tracks taps, stores the running balance safely in the cloud, and syncs it back to the device instantly after each session. Here’s what I need you to hand over: • Registration/login (email or Google) • Main tap interface that increments and displays the balance in real time • Secure, lightweight backend—Firebase is fine, but I’m open to another service if you prefer—to keep balances tamper-proof • Simple admin setting (panel or JSON) so I can adjust the tap-to-point ratio without releasing a new build • Minimal Material-style UI with an ad placehol...

    $65 Average bid
    $65 Oferta promedio
    14 ofertas

    My project centres on an advanced client-side modification for Minecraft 1.21 that introduces brand-new items and blocks, bespoke GUI screens, and deeper gameplay mechanics—plus a few surprise features still on the roadmap. Code must be written in Kotlin and Java, follow clear architectural patterns, and stay lean enough to keep frame times smooth even during heavy packet traffic. Because the client will also interact with Velocity, BungeeCord, or Waterfall proxies, I need someone who is comfortable tracing packets end-to-end, optimising network calls, and squeezing every last millisecond out of performance-critical paths. A rock-solid grasp of Minecraft’s rendering and input pipelines is equally important, as several custom interfaces push well beyond vanilla constraints. He...

    $12 Average bid
    $12 Oferta promedio
    1 ofertas

    I need a New Junior Level Developer from Pakistan. I need at low budget work I need work for long term

    $5 / hr Average bid
    $5 / hr Oferta promedio
    9 ofertas
    Novu Integration Support Needed
    6 días left
    Verificado

    I’m in the middle of rolling out Novu and have run into an integration problem that my developer and I can’t pin down. I need someone who has hands-on experience wiring Novu into production systems to jump in, review our implementation, and guide us to a clean fix. You’ll get access to our repo, current configuration files, and any logs you need. From there, I’d like you to isolate the root cause, implement or outline the corrective steps, and walk us through the changes so we understand exactly what was done. Clear, annotated code or configuration snippets are essential, and a brief hand-off note explaining the solution will wrap things up. If you’ve previously integrated Novu—especially the notification workflows, API hooks, and environment setup&md...

    $23 Average bid
    $23 Oferta promedio
    35 ofertas

    I’m ready to turn my store concept into a dedicated Android application and need a developer who can guide the build from first commit to Google Play release. This project is strictly for Android, not cross-platform, so deep knowledge of Android Studio, Kotlin/Java, and current Material Design guidelines is essential. The app’s core mission is straightforward: allow users to browse products, add them to a cart, and check out securely. I already have a basic product list and brand assets; you’ll help translate those into a smooth shopping experience with clean navigation, responsive layouts, and a payment flow that meets PCI standards. Key delivery points: • Functional Android app (APK + Play Console-ready bundle) • Source code with clear, maintainable struct...

    $18 / hr Average bid
    $18 / hr Oferta promedio
    66 ofertas

    I’m looking for an Android developer who can turn my rough concept for a land-survey app into a working MVP within 30 days. The app must: • Use the device’s GPS to log points accurately. • Provide real-time distance and area measurement tools. • Sync every reading straight to Firebase—the project will stay online-only, so no offline caching is needed. • Let users export their collected data (CSV or a similarly easy format) directly from the app for further analysis. I already have a Firebase instance waiting; you’ll wire the authentication, real-time database / Firestore, and basic storage needed for the exports. Clean, readable Kotlin code, a straightforward UI, and full project files in Git are part of the expected hand-off, along with ...

    $693 Average bid
    $693 Oferta promedio
    30 ofertas

    I need two experienced full-stack web engineers to start right away and work with me long-term at roughly $40 per hour. Daily voice calls are a core part of our routine, so C1+ level spoken English is essential; you’ll be talking through architecture, pair-debugging and raising questions every day. Your toolbox on the frontend must already include React and Angular. If you also enjoy the occasional Vue.js task, that’s a pleasant bonus. On the server side we run services written mainly in Python and Java, so you should feel at home designing RESTful APIs, writing unit tests and deploying through common CI/CD pipelines for at least one of those languages. Data lives in MySQL, PostgreSQL and MongoDB, and you’ll be expected to model schemas, tune queries and handle migra...

    $33 / hr Average bid
    $33 / hr Oferta promedio
    233 ofertas

    I’m working on a Linux workstation and I need the latest release of ThingsBoard cloned from GitHub, opened in IntelliJ IDEA, and built without errors. The goal is simple: I want to hit “Run” in the IDE and see the platform start up locally, proving that the full compile-and-package cycle works on my machine. I’ve already installed IntelliJ IDEA and JDK 17; everything else can be adjusted as you see fit (Maven wrapper, Gradle, or direct Maven install—whatever is cleanest for the project). No extra database, third-party API, or special integration is required right now; the focus is purely on getting a reproducible build inside the IDE. Deliverables • Step-by-step instructions (or a shell script) that clone the repo, import it into IntelliJ, resolve all d...

    $11 Average bid
    $11 Oferta promedio
    6 ofertas

    My Android app still consumes far more RAM than it should, even after a thorough refactor of the most intensive code paths. The goal of this job is to pinpoint the remaining causes of excessive memory allocation and ship an updated APK that runs lean on typical mid-range devices. Scope of work • Profile the current build in Android Studio (Memory Profiler, LeakCanary, or your preferred tools) to surface leaks, object churn, or oversized bitmaps. • Implement concrete fixes—whether that means eliminating holding references, down-sampling assets, reworking caching logic, or other optimisations you identify. • Verify improvements with before-and-after metrics (heap size, GC frequency, and overall footprint during normal app usage). • Supply the patched source...

    $472 Average bid
    $472 Oferta promedio
    95 ofertas

    I’m eager to dive into more Chinese dramas and want a well-organized watchlist that makes it simple to start watching right away. Your task is to research and compile a selection of engaging series that can be streamed legally online. Scope of work • Build a list of at least 20 Chinese dramas released within the last 10 years. • For each title, include: – Official English title (and original Mandarin title, if different) – Year of release and episode count – Primary genre(s) and a one-sentence hook or synopsis – Verified streaming platform link(s) that are accessible in my region or globally (e.g., iQIYI, WeTV, Netflix, Viki). • Highlight any series that offer English subtitles; note if only Mandarin audio is available. &b...

    $71 Average bid
    $71 Oferta promedio
    5 ofertas

    I already have a fully working Android app project; I now need it packaged as an Android App Bundle (.aab) and released on Google Play. The source code compiles correctly, but I have only produced app in Google aistudio, so I’m looking for someone who can: • Open the existing Android Studio project, resolve any build-variant issues if they appear, and generate a signed .aab that meets Play Console requirements. • Walk me through (or handle for me) setting up a brand-new Google Play Developer account, including payment profile and two-factor security, so the app can be uploaded without delays. • Prepare the Play Store listing assets—high-resolution icon, feature graphic, phone/tablet screenshots, and a concise, keyword-friendly description. I have no graphics...

    $23 Average bid
    $23 Oferta promedio
    13 ofertas

    I Need an Advanced Automation Developer – Redirect-Based Booking Bot (Goethe, Wicket Apache, COE Session Handling) For Goethe Booking like Chennai and Bangalore I am looking for a high-level automation/bot developer who has experience with: Wicket/Apache-based web applications Multi-step redirect chains COE session initialization & dynamic token handling ColdFusion (CFID/CFTOKEN) & JSESSIONID flows Cookie extraction & accurate replay of Set-Cookie across redirects Chrome CDP automation / Playwright / Puppeteer High-speed DOM watching (DOMWatcher / MutationObserver) Proxy rotation & session isolation --- Project Goal Build a bot that can open the “Select Modules / Book” page reliably during Goethe exam seat drops, even when: normal browser at...

    $268 Average bid
    $268 Oferta promedio
    26 ofertas

    I am looking for a consultant to assist with a research project involving runtime data analysis. We are using specialized hardware to monitor application states and need assistance identifying stable data structures and address paths within a complex, proprietary environment. The goal is to develop a Python-based framework for real-time monitoring of system events.

    $52 Average bid
    $52 Oferta promedio
    25 ofertas

    Technical Specification: Serverless AI-Enhanced ESG Platform 1. Project Overview A multi-tenant, serverless SaaS platform for ESG (Environmental, Social, and Governance) reporting and verification. The platform allows companies to upload sustainability guides and data, which an AI then analyzes to provide verified commentary for bankers and regulators. 2. Core Pillars (Non-Negotiable) Pillar 1: AI RAG Engine (Verification Logic) Dynamic Context Switching: The AI must switch context based on the selected Guide (e.g., NoS-F, GRI 11). Logic must use metadata filtering (e.g., guide_id) to prevent "sticky" context. Evidence Vault (Citations): Every AI-generated claim must include a source citation (Document Name + Page Number). LLM: AWS Bedrock (Claude 3.5 Sonnet). Pillar 2: C...

    $4195 Average bid
    $4195 Oferta promedio
    110 ofertas

    I’m building a revenue-focused Android app and need a developer who can take it from concept to a polished release on Google Play. The core requirement is a seamless, secure payment option—think in-app purchases or a checkout flow tied to a trusted gateway. Other bells and whistles such as push notifications or social media hooks are not on the roadmap right now, so your energy can stay squarely on clean architecture, smooth UX, and bullet-proof payment handling. You’ll guide the end-to-end process: set up the project in Android Studio, wire up the payment SDK or API of choice, and make sure transactions are processed, verified, and logged reliably. I’ll supply branding assets and any copy; you deliver an installable APK (or AAB), full source code, and a quick READ...

    $10 / hr Average bid
    $10 / hr Oferta promedio
    46 ofertas

    I am looking for some one to build API integrations for: **** **** REQUIREMENTS: Expose all available data points and actions provided by each platform’s official API. This should be done by thoroughly reviewing and implementing everything documented in their API documentation, without omitting endpoints or features. CORE FUNCTIONALITY (Required) The API integration must support, but is not limited to, the following: - Trading & Order Management * Place buy orders * Place sell orders * Batch order placement * Modify existing orders (if supported) * Cancel individual orders * Cancel all open orders - Portfolio & Account Data * Real-time and snapshot views of portfolio holdings * Wallet balances and margin information * Open positions and exposure * PnL (realized and unr...

    $516 Average bid
    $516 Oferta promedio
    68 ofertas
    Android PDF Scanner & Manager
    5 días left
    Verificado

    I’m building a full-featured document utility for Android that lets users move effortlessly from a paper bill or a gallery image to a well-organised, shareable PDF collection. The core requirements are already mapped out, but I need an experienced Android developer who can turn the checklist below into a smooth, modern interface that feels at home on recent devices. Key functionality to implement: • Capture bills or receipts with the camera, then auto-crop and auto-rotate the result • Pull multiple images from the gallery, rearrange their order, and export them as one PDF • Generate PDFs from typed or pasted text • Display PDFs natively inside the app and surface the most recently created files for quick access • Open, share, delete, rename, and auto...

    $106 Average bid
    $106 Oferta promedio
    29 ofertas

    We need an experienced Solr developer to migrate our existing SOLR 4.4.0 instance to version 9.10 on a new DigitalOcean droplet. Your Responsibilities: Convert to managed-schema format for SOLR 9.10 compatibility Update and validate for version 9.x Review field definitions, analyzers, and tokenizers for breaking changes Test query syntax, API calls, and search results post-migration Collaborate with DevOps during data migration and cutover Verify application integration and search functionality Project Details: One-time migration project SSH root access provided to both droplets Work alongside our DevOps team

    $143 Average bid
    $143 Oferta promedio
    23 ofertas
    Android Mini-App Collaboration
    5 días left
    Verificado

    I’m juggling a handful of bite-sized app ideas for Android and I’d love to co-build them with someone who thrives in a “vibe-coding” environment—think Lovable or Antigravity sessions spun up on Replit with a little Claude-powered brainstorming on the side. The goal is rapid MVPs: we sketch, prototype, and push a working build without the heavyweight ceremonies that usually drain small budgets and creative energy. You’ll be free to shape features, suggest tech stacks, and pair-program in the tools you’re most comfortable with, as long as we can iterate quickly and keep the codebase readable and lightweight. If you enjoy late-night commits, screen-sharing, and collectively polishing micro-projects into publishable Play Store releases, we should clic...

    $21 Average bid
    $21 Oferta promedio
    16 ofertas
    $48 Oferta promedio
    24 ofertas

    Hi, I have a skilled development team specializing in building scalable web, mobile, and business solutions for startups and growing businesses. Our Expertise Includes: Backend: Node.js, TypeScript (ts-node), Python, PHP, Laravel Frontend: React.js Mobile Apps: Android (Kotlin) CMS & E-commerce: WordPress, Shopify Custom Solutions: APIs, automation, SaaS products, and internal business software We are currently looking for freelancers or business development partners who can bring us genuine projects on a commission basis. Commission Details: 10% – 25% commission per successfully closed project Commission paid after client’s first payment No earning cap, long-term collaboration possible Your role will be to connect us with clients and help close the deal. No tec...

    $250 Average bid
    $250 Oferta promedio
    17 ofertas

    I need a New Junior Level Developer from Pakistan. I need at low budget work I need work for long term

    $7 / hr Average bid
    $7 / hr Oferta promedio
    18 ofertas

    I want to turn my existing e-commerce site, , into a full-featured Android application. The web store is already live, so the app must pull all data (accounts, products, images, stock levels, orders) directly from the same database to keep everything in sync. Core features I need implemented: • Secure user registration and login using the credentials that shoppers already use on the site. • A smooth product catalogue with search, filtering and detailed product pages, followed by an in-app cart and checkout flow that mirrors the website. • Built-in customer-support chat so users can message us in real time while browsing or after a purchase. I will provide API endpoints, database access and brand assets. The code should be written in native Android (Kotlin or Java in ...

    $15940 Average bid
    $15940 Oferta promedio
    151 ofertas

    I need a polished, fully native Android application that lets customers browse a catalogue of physical goods, add items to a cart, and complete a secure checkout. The entire flow—from product discovery to order confirmation—should feel fast and intuitive on modern Android devices. My priorities are: • Smooth product browsing with clear categories, search, and filters • A dependable cart and checkout process tied to a popular payment gateway • Secure user authentication and profile management • Basic admin interface (web or in-app) where I can add, edit, or retire products, photos, prices, and stock levels • Clean, maintainable Kotlin/Java code and well-commented project files Deliverables 1. Production-ready APK plus signed release build ...

    $165 Average bid
    $165 Oferta promedio
    38 ofertas

    Develop a payment gateway module that integrates with multiple Payment Service Providers (PSPs) via a standardized interface (PSP Adapter), enabling payment processing across arbitrary platforms. The module should support multiple payment methods, configurable through an external configuration file. Payments are processed on behalf of tenants, with tenant-specific PSP configurations stored in the database and linked to tenant IDs. For this scope, PSP Adapters will be implemented for Stripe, PayPal, and a dummy “No-Op Provider,” with the module designed to allow easy addition of new PSPs in the future. It must support recurring payments and ensure that all transactions are fully traceable and auditable. Full payment gateway specification (TO BE FOLLOWED - READ CAREFULLY): De...

    $601 Average bid
    $601 Oferta promedio
    137 ofertas

    I’m looking to streamline my customer chats on WhatsApp by using 6–10 well-crafted canned responses. I already know the typical questions my audience asks; what I need is a practical way to load these replies into WhatsApp Business and trigger them quickly—either through quick-reply shortcuts or a lightweight automation that recognises simple keywords. Here’s what I expect from you: • Draft 6–10 clear, professional canned responses in Indonesian, ready for direct copy-paste or CSV import. • Provide step-by-step instructions (with screenshots if possible) on how to add them to WhatsApp Business on Android. • If you prefer an automation route, outline the tool or API you’ll use, set it up, and show me how to maintain or edit the replies...

    $60 / hr Average bid
    $60 / hr Oferta promedio
    15 ofertas

    I’m starting with a blank slate and need a skilled developer who can turn my concept into a brand-new Android application. The project covers everything from planning the core functionality and crafting an intuitive UI, to coding, testing, and delivering a production-ready APK that meets current Google Play guidelines. I have the initial idea and key features in mind; what I need now is your expertise in selecting the right tech stack (Kotlin, Java, or a suitable cross-platform framework that still outputs native performance), structuring the app architecture, and guiding any API or backend decisions. Clear, maintainable code and iterative test builds are essential so I can review progress and give feedback early. Deliverables • Fully functional Android app (latest Android SDK...

    $46 Average bid
    $46 Oferta promedio
    27 ofertas

    I already have a stable Android code-base written in mixed Java / Kotlin that targets an offline-first workflow (SQLite locally, SQL Server remotely) and exchanges data through FTP-triggered PHP/HTTP scripts. The project sits on a legacy Gradle 4 stack, and I use a separate C# utility to pre-seed the local database before each release. What I need now is a senior-level pair of hands to take full ownership of the end-to-end APK generation cycle. All SDKs, NDKs, keystores, and signing configs are present on my machine; the environment is ready—you simply step in, run the build, and hand back repeatable output. Scope of work • Pull the existing repository, resolve any Gradle-4 quirks, and confirm the build variants compile cleanly. • Produce a signed, installable release...

    $166 Average bid
    $166 Oferta promedio
    16 ofertas
    Sea Sports SOS MVP
    5 días left
    Verificado

    I am validating a safety-first concept for people who practice sailing, paddle boarding, kite surfing and similar sea sports. For this first low-budget MVP, I need a mobile app which is a reliable SOS signal that a user can trigger in one tap, even with spotty connectivity. I will hand over concise functional documentation, wireframes, copy, and a clear user flow. Your job is to turn that input into a lightweight, production-ready APK that a small pilot group can install and test in real conditions. Key elements I expect to see: • One-tap SOS that immediately raises an alert on our backend (or a lightweight third-party service you recommend) • Real-time location sharing while the SOS is active, visible on an in-app map view • Automatic notifications to predefined con...

    $593 Average bid
    $593 Oferta promedio
    197 ofertas

    I need an Onshape software programmer to help with scripting and automation using Python. The automation tasks include: - Parametric designs - Batch processing - Data extraction and reporting - Automatically finding weld lengths Ideal skills and experience: - Proficiency in Onshape and Python ,Java ,feature script - Experience with scripting for CAD automation - Strong problem-solving skills - Familiarity with parametric design and data handling in CAD environments Looking for someone who can streamline these processes and improve efficiency.

    $239 Average bid
    $239 Oferta promedio
    18 ofertas

    I have several mid-level interviews focused on Algorithms and Data Structures, all in Java, scheduled over the next few weeks. I need an experienced mentor who can sharpen my problem-solving speed, boost my confidence with tricky edge cases, and polish the way I communicate my approach out loud. Ideally, each session will feel like a real interview: you present a fresh problem, watch me think aloud, challenge my design choices, and then walk me through cleaner or more optimal solutions in Java. Detailed feedback on runtime, memory trade-offs, and code readability is crucial. Deliverables I’d like to see after each session: • A short written summary of where I did well and where I hesitated • Annotated sample code in Java showing the final, accepted solution • Act...

    $28 / hr Average bid
    $28 / hr Oferta promedio
    12 ofertas
    Android Low-Latency Audio Modem
    5 días left
    Verificado

    I am building a proof-of-concept Android application that behaves like an “audio modem,” pushing and pulling live audio through a WebSocket connection with the absolute minimum possible latency. The primary scene is real-time audio streaming, so every design decision should favour tight buffering, fast reconnection and clean, uninterrupted playback. Here is what I need from you: • A lightweight Android app (Java or Kotlin) that opens a configurable WebSocket endpoint, captures audio We need an Android app that runs on a **Redmi 4A (Android 7)** device the app will capture audio from the headset mic via loopback cable and send it to our backend over **WebSocket**, using **Opus encoding**. Incoming audio from WebSocket must be decoded and played back into the headset o...

    $159 Average bid
    $159 Oferta promedio
    54 ofertas
    Android Habit Tracker With AdMob
    5 días left
    Verificado

    I want a clean, professional-looking Android habit tracker that helps users build routines and see real progress at a glance. The core flow is simple: a user adds a habit, gets a daily notification, checks it off, and watches the resulting data turn into easy-to-read statistics and graphs. Key requirements • Daily reminders delivered via Android notifications • Interactive progress screens with charts/graphs (line or bar—whatever best visualises streaks and success rates) • In-app statistics section summarising totals, streaks and completion percentages • Seamless AdMob banner and interstitial integration that respects Google policy and does not disrupt the user journey • A polished, professional UI that feels consistent with modern Material guide...

    $299 Average bid
    $299 Oferta promedio
    39 ofertas

    1. Each table is assigned with tables 2. customer can order from tablet on thier table they can input guest number 3. customer can add edit order with modifiers 4. Menu item set by admin with modifiers add 5. Waiter can take order with their handy 6. users are assigned with roles waiter, cashier, manager and admin 7. customers order send to tablet or kds in kitchen and also print orde receipt with barcode 8. cashier can scan barcode and make payment settlement 9. Admin can add payment methods etc,

    $264 Average bid
    $264 Oferta promedio
    56 ofertas
    Sk sumit brande
    5 días left

    I want to bring a new social-networking idea to Android and need a developer who can take the concept from wireframe to a smooth, production-ready release on Google Play. The project is mobile-first, so every decision—from UI layout to database structure—should be made with Android’s current design guidelines and performance constraints in mind. Core scope • Build a native Android application (Kotlin or modern Java) that lets users create profiles, connect with others, post content, and receive real-time updates. • Implement a clean, scalable back-end (Firebase, Supabase, or another cloud option we agree on) to handle authentication, media storage, and push notifications. • Deliver both the full source code and a signed APK ready for store submission...

    $2 / hr Average bid
    $2 / hr Oferta promedio
    6 ofertas

    I need an Android-based POS application packaged as an APK that runs smoothly on a local server so the restaurant can continue operating even when the internet drops. The core workflow covers dining-room table management, item and modifier setup, role-based user accounts, and quick order processing right at the device. Display orders in kds and print receipts order and payment. Every staff member must log in with a role that limits access to only what they need—cashiers handle sales, waiters work with tables and orders, managers see the full back-office view. Within that back-office I have to be able to create or deactivate users, add new menu items or modifiers on the fly, and rearrange tables without touching the code. Because the server lives on-premise, data sync and backup ...

    $1299 Average bid
    $1299 Oferta promedio
    66 ofertas

    Saya ingin meluncurkan sebuah aplikasi Android tetapi masih bingung harus mulai dari mana. Target saya jelas: dalam satu bulan sudah ada versi fungsional yang dapat di-install (APK) beserta kode sumber lengkapnya. Ruang lingkup yang saya butuhkan meliputi: • Pemilihan arsitektur dan stack terbaik (Java atau Kotlin, kompatibel Android 8+). • Desain antarmuka sederhana, bersih, dan mudah dipahami. • Implementasi fitur inti—kita diskusikan detailnya bersama; saya terbuka pada saran Anda. • Pembuatan paket rilis dan, bila memungkinkan, pendampingan unggah ke Google Play Console. Kriteria penerimaan: • APK berjalan stabil tanpa crash di perangkat Android terkini. • Kode tersusun rapi, terdokumentasi, dan bisa saya bangun ulang di Android Stu...

    $18 / hr Average bid
    $18 / hr Oferta promedio
    7 ofertas

    I need an AI-driven image recognition system tailored for healthcare use. The core requirements are object detection and image classification so that medical photos—X-rays, scans, pathology slides, or similar inputs—can be analysed automatically and returned with reliable, structured results. I am open to whichever framework you prefer (TensorFlow, PyTorch, Keras, or a comparable stack) provided the final model can be trained further with my proprietary data and accessed through a straightforward REST or gRPC API. A lightweight demo interface that lets me drag-and-drop images and view predictions in real time would be ideal for internal testing. For delivery I will need: • The reproducible training pipeline (code, environment files, and clear instructions) •...

    $47 / hr Average bid
    $47 / hr Oferta promedio
    11 ofertas

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