With my wealth of experience in software development, spanning over 7 years, and my proficiency in JavaScript and Python, I believe I am uniquely positioned to create the integration you need between your Retool platform and MercadoLibre. It is worth noting that Restful and SOAP APIs, which are central to this project, are part of my daily work; their seamless integration should pose no trouble at all.
Additionally, I hold deep knowledge of databases such as PostgreSQL as well as a myriad of others, including MySQL and MongoDB which could come in handy for ETL processes. Importantly, I can assure you that as a tech enthusiast, your satisfaction ranks top-most in my priorities.
In conclusion, choosing me guarantees you a professional who is versed in web development across multiple languages like Node.js (whose efficiency will be vital for this project), React.js (for creating an interactive user interface) and C#(in-case we need any desktop-based solution). You can rest assured the integration with MercadoLibre will go smoothly. So why wait? Let's integrate!