API stands for Application Programming Interface, and it is an layer of interface that allows programs to interact with each other. An experienced API developer can build complex interactions between applications, making them faster, more reliable, and accurate. Whether you need a second opinion on your existing application or you want to create an entirely new application for your business, an expert API Developer can do the job for you.

An API Developer's job does not stop at developing. They can also work on design and implementation testing, guide through the entire architect process from prototyping to implementation, create custom system integration solution based on the project requirements, and collaborate with other teams to develop systems that meet customer expectations.

When hiring an API Developer through Freelancer.com, rest assured that they are as competent as any hired onsite software engineer.

Here’s some projects our experts have worked on:

  • Building custom interfaces to move large amounts of data efficiently between applications
  • Working with Javascript to allow websites to access external information relating to weather conditions
  • Creating Grafana dashboards for quick and easy visualization of data points
  • Developing scripts to connect external APIs with more heavy-duty platforms like Microsoft Azure
  • Debugging mobile apps involving fishing
  • Integrating AI capabilities into online shops
  • Automating regression tests so developers can work faster and more accurately

No matter what your business needs are in terms of API development, our expert freelancers are ready to take on the challenge and provide support whenever you need it. With expertise in debugging applications and web development, you're guaranteed to find the right developer for your project! So why wait? Post your project today at Freelancers.com and reap the benefits of working with an expert API Developer now!

De 176,141 opiniones, los clientes califican nuestro API Developers 4.88 de un total de 5 estrellas.
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    43 trabajados encontrados, precios en USD

    Aplicación para técnicos de mantenimiento, funciona como agenda de trabajo, en el cual se podrá apuntar tareas de reparación pendientes y también tener un calendario con día y hora de las inspecciones del centro de trabajo. Contendrá un historial de las reparaciones finalizadas anteriormente. La aplicación será desarrollada de forma nativa en Android utilizando lenguaje Java y consumiendo una API para temas de backend. Si es posible me vendría tener el Código fuente de la aplicación y de la API, así como también diagramas de entidad relación y diagrama de clases

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    Necesito alguna persona que me cree un bot que conecte chatgpt con twitch, se creará un personaje virtual que deberá contestar las preguntas de chat y jugar a juegos, la IA aprenderá poco a poco a jugar sola a juegos sencillos. Agradecerá las subscripciones y interactuará con el chat.

    $157 (Avg Bid)
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    We are having an application where were using a feature to read emails from IMAP, email are hosted with office 365. Now Microsoft has stopped supporting IMAP and instructed to only use OAuth2. We are looking for a developer who is skilled in OAuth2 and fix the functionality to read emails.

    $84 (Avg Bid)
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    5 ofertas

    i have this api i want to integrate with my wordpress website i need you to show me how i can do it this is the documintion

    $55 (Avg Bid)
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    Mobile pos App 6 días left

    2. The system is like a point of sale but may not have all functions of a pos just a few functions of a pos . l have a video showing the presentation but unfortunately here you cant upload a file bigger than 25mb .

    $620 (Avg Bid)
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    Build me a Website -- 2 6 días left

    I'm looking to hire an Django and Mongo DB expert who can able to write SEO-friendly Blogs . I want to hire for a full-time role. Please bid with your portfolio if you're interested. I have domain and ubuntu server. Django, Mongo DB, API, Git

    $255 (Avg Bid)
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    Fix search issue in my flutter app 6 días left

    I have a search issue in my flutter application where I cannot search for services. The function used to work but it stopped working and I'm not sure what has made it so. The app has an API with a web portal. I would also like the search to be fast.

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    I am looking to automate the selling/buying of manually entered options contracts based on a complex study.

    $2445 (Avg Bid)
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    Looking to have a basic Order Entry Panel designed in Python. With trading, typically there is a built-in Order Entry panel. But due to the amount of processing going on with charts and data and indicators, the trading platforms that are currently being used are bloated and lagging. The idea behind this panel is to allow traders to use whatever platform they wish for their charting and analysis, but then they would enter the orders through this panel. This panel need to be light, thin, snappy, responsive and modern look. I have all of the CQG data API information and it will connect to AMP Futures broker. I will provide demo/test login once project is accepted. I have ideas on the layout and the logo and buttons have already been designed. But the most important part is to get this func...

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    rest api for guns.com and other 5 días left

    These websites allows sellers to manage inventory with rest api My desire is to use the RestAPI to manage my inventory and possible orders Currently I manually create the product listings and when we sell on a website I have to manually remove from other websites. I do have my data in a sql database so I can assist with the data table but you will have to do the api I have no experience in that JIm

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    So I have a running website and I am in need of API developers to write some APIS for this project. The website is built using PHP, Laravel. I do have mobile apps hosted in play store. I have made few enhancements in the website so I am looking for a API developer to write the APIS in postman. Need around like 5 APIS.

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    Hi freelancer, I have nxtbanking mobile recharge api, i need to integrate this in my existing portal, If you can integrate this, let me know.

    $80 (Avg Bid)
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    IOS - VTD Manager app 4 días left

    I require a IOS developer to create a fairly simple app which interacts with multiple APIs Extra info in the attached files which should be read before quoting. More detailed explanation file added 19th March - IOS app more detailed

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    Greetings everyone. We are looking for a freelancer with more than 5 years experience on the fields of Blockchain, smart contracts and Web 3. Requirements - Desing and Logo of platform - Smart Contract of Token (Tokenomics needed to be in logic of smart contract and the smart contract to have the staking logic too) - Integration of Metamask , Coinbase and Trust wallet - Connecting price from 20 different exchangers API (Selling Price - Asking Price - Average Price) - Users to be able to buy subscriptions to use the services. Subscription must be able to get paid through our token and through another 10 tokens we will share with you - Creating Admin Panel from where we can do the following : backend we must connect trading view chart and from admin us to be able to draw technical...

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    Data Lake 4 días left

    I would like to build an API Data Lake platform with transformation and data integration services.

    $543 (Avg Bid)
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    build fintech news site with api 4 días left

    I'm looking to hire a Freelancer to build a new fintech news website with an existing API. I have my domain and hosting already set up and the API available for integration. Additionally, I'm looking for the website to be able to host content from multiple sources if possible. Basically, I'm looking for a freelancer who can put together a great website for me, integrating an existing API and allowing for content from multiple sources. If this sounds like a project you'd be interested in, please contact me!

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    Hello, i´m looking for a programmer who can write an upload / download tool for usenet. (binary newsgroup poster). usability, stability and security should come first. please keep in mind that changes may still be made during testing! My Requirements are: -Combine the settings of the programs mentioned (ngPost, Nyuu, NewsUP, SabNZBd) -download functions like the program "sabNZBd" -for Windows (With a proper installation routine and as an .exe file!!) -C# -NNTP (Network News Transfer Protocol) -modern GUI and a nice logo :) -source code, commenting on the source code properly ! -expandable ! -API usage -work with rss feeds -Periodic check if files still complete -option for hidden autostart -The program is supposed to download a certain sort of links like url use with an b...

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    Please be careful before you knowledge the In-games ID Platform. More precisely, you can add the necessary info manually, but it is not possible for it to be generated automatically with some API integration using an in-game ID. Not without custom coding, I'm afraid. Since custom coding isn't included in theme support service, you would need to either find a freelancer to custom code this functionality for you or do it yourself, if you have the sufficient coding experience required. in-game ID when they sign up example and they can detectable in-game id cross-platform integration so I can be building tournaments and etc PSN ID: MrPrinceAce Xbox ID: MrPrinceAce Admin backend I can set up the field In-game IDs: Steam ID, uPlay, Xbox Live, Nintendo ID, PSN ID, etc Applica...

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    shipping website like stamps.com 3 días left

    clients must create their accounts on the website by filling the online form and upload their IDs we have to verified on our end and activate their accounts. they can get the shipping labels ( United State Post Office, DHL, ups … ) from the website which is connected via APIs to the couriers. Examples: ….. features: saved shipping presets history report

    $629 (Avg Bid)
    Acuerdo de Confidencialidad
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    Need an engineer who is well versed using OpenAI And hugging face API to build fine tuned models with proprietary data.

    $24 / hr (Avg Bid)
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    I am looking to get a project developed end to end which fulfils everything required from - pre-sales - RFQ submission - including finding hotels, ground transportation, events, food and activities via direct contracting or via DMC routes. - quotes - closures - post sales - during the movement We would like to keep it interactive like a social media interactive platform, informative and covering other important aspects to keep a group of people from 100 to 2000 in close link. Sample website (although nowhere close to what we want as they look like build by basics and some 10 years ago) are - ;

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    It is a desktop application which could be described as a 'marriage between a graphics calculator and a spreadsheet' to assist students of data science projects. They load data into the internal SQLite database manually with DB Browser for SQLite or by writing custom Java code connectors that download data from the network. Then they use the data inside the internal SQLite database to create new results by writing custom Java code batch formulas. Afterwards they visualize all the data with 3D plots. You just have to provide a sustainable data-agnostic framework for years to come and do not need to know about all the details of data science. ( You will be contacted to apply for the job and will be given more detailed information you are expected to render into a brief overview ...

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    Hi, I'm looking for a Web developer for a one year long term project or longer, that includes CMS development for Joomla and WordPress. From creating components, modules, plugin, templates to other ongoing tasks. Price will be on monthly level

    $773 (Avg Bid)
    Acuerdo de Confidencialidad
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    Requirement: Custom API Creation Implemented at : PHP-based Custom Warehouse Platform for which API needed : Amazon, Bol, Exact, Open cart and many more. What data we need fetch : We need to get orders and order details in real-time. As client has WAREHOUSE so he wanted his end client's store ORDER get auto synch with the help of API Who can Apply : Those who have similar experience and having expertise in creating connection API Do we need 1 Company/Person do all API : If yes, its GOOD, if not even any 1 API can be created that also good to go. SUMMARY : We are seeking an expert Connector API Developer who specializes in creating bridging APIs between a custom warehouse and eCommerce stores. The ideal candidate should have a deep understanding of RESTful API design principles ...

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    OKX API , C# Project 2 días left

    There are project with open source Tasks : 1-Install it and run project with any action like check balance ets .. 2-Page to Add multi api for several Master account and every Master(S) has a Sub-accounts(S) . after that i have detiles how we will used this api

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    Data Engineer/Python API Developer 2 días left

    Develop python APIs, create lambda functions and Glue jobs on AWS, CICD using jenkins, Airflow 10-15hr/week

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    We would need to be able to read/write data from a database in Business Central On-Premise using their APIs. We have the location of your server where the business center is located as well as your server instance and the environment that would be the test environment. I understand that we would need more data such as the APIVersion, APIVersion, APIGroup and EntityCaption or EntitySetCaption in order to have the complete url from which to obtain the data. On the other hand, in terms of authentication, they have provided us with a username and password, but I think we need a web service key to be able to authenticate ourselves.

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    AI expert needed 2 días left

    A project where we use external APIs(including openAI) to curate content across the internet and build a freemium product. Needing someone who can work on equity basis and have skin in the game. You will be focusing on embeddings and other APIs. We have in-house developers to take care of everything other than AI/ML part of the project

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    Automated Video Creation. The following process describes creating an automated photo slideshow video with images generated by a Discord image generator, based on custom input texts, and posting the resulting videos to YouTube and Instagram:

    $518 (Avg Bid)
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    The following process describes creating an automated photo slideshow video with images generated by a Discord image generator, based on custom input texts, and posting the resulting videos to YouTube and Instagram:

    $173 (Avg Bid)
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    1: Integrate the ChatGPT API into our existing Microsoft Teams environment via the Chat feature. (not Channels) 2: Enable users to initiate a chat conversation with ChatGPT within Teams. 3: Leverage existing apps or plugins wherever possible. 4: Provide an overview of findings, including any additional subscription costs that will apply to the solution, before going ahead. Please apply if you have tons of experience in ChatGPT API integration.

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    Please apply if you have tons of experience in ChatGPT API integration.

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    I need 9 square products to be implemented as subscriptions. The subscription needs to trigger to be in the fulfilment queue much like a one time product purchase for shipment. Looking for someone with Square experience as subscriptions are not a readily made option on the product profiles on Square. This is in the Square platform (, not Squarespace.

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    I have a set of ebooks and a chatbot has to be created to give read the ebook files and generate output for queries. reference - The output has to be like API and it will be hosted in an API platform. Later I will use the API in my website.

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    I need a solution where I can have newsletter subscribers added to my Selzy email lists without Double Optin. The API Info I have been provided by Selzy support is for the subscribe method at My website uses Wordpress with the Form builder Forminator. The solution would need to be; 1. provided for me to self-install on my website. 2. universal to enable me to use it for any other subscription form I may set up on Selzy, or have the instructions on how I can do that myself.

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    NodeJS with MySQL 17 horas left

    We need ~15-20 APIs to be created. The database is already present for few and needs to be made for others. More information is to be shared after selecting the freelancer. The work needs to be started right now itself. It is a time-bound urgent task to be done as soon as possible.

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    The project requires experience of SDN, Mininet, RYU python application development. This is the first of multiple tasks we need to get done (expect more work if you perform well). Details about the project will be provided to interested candidates. This project is required to be delivered in 2-3 weeks.

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    looking for a Flutter Developer with experience in developing mobile applications using Dart, Flutter framework, building UI/UX, react native integrating REST APIs and payment gateways you will work closely with our design and product teams to build mobile applications for iOS and Android platforms.

    $6 / hr (Avg Bid)
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    project-mI 4 horas left

    e-commerce app generate sales with the help of you and me marketing devoloping appliction

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    I need a Wix developer for a small project on our current Wix website. That address is: On our page: we have a gauge for river levels. I need this page upgraded to be cleaner and have more streamline info that is updated real time. An example of what we like can be found at: Any help?

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    Wordpress API -- 2 Finalizado left

    Salve, sto cercando uno sviluppatore per implementare nel mio sito wordpress un’automazione tramite API. Voglio che i link che vengono caricati su due siti: e vengano automaticamente copiati in un’altra cartella e se quei link vanno offline la copia farà un’altra copia e sostituirà l’originale cambiandola nel database di wordpress. In poche parole dei link tramite excel vengono caricati nelle pagine con il plugin tablepress e tramite un codice viene mostrata la tabella per poi comparire nella pagina in questione, essendo che ogni tanto i link scadono o vengono rimossi per dmca, voglio un sistema che in automatico mi sostituisca il link su tablepress senza che lo faccia io. Esempio di link: Esempio di cosa và cambiato su streamtape: Esempio ...

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    looking for a an expert in Clouflare Finalizado left

    what you need to know : able to understand whats a secure communication between Cloudflare and aws Server with a TLS certificate using Cloudflare’s SSL mode Full-Strict configure Cloudflare Argo Tunnels write an API call that outputs DNS records of my domain. know how to Lock down access for a particular path thx

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    Explicit Filtering Phase -- 2 Finalizado left

    Explicit Filtering Phase project as discussed in chat for phrase detection and resultant redirect.

    $470 (Avg Bid)
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