Senior React & Node.js Developer with AWS Expertise for Fixes in Multi-Language Marketplace MVP

We are looking for an experienced Full-Stack Developer with strong React, Node.js, and AWS expertise to fix, improve, and stabilize our existing multi-language marketplace MVP. The application is already developed, but we need a senior developer who can understand the existing codebase, identify issues, fix bugs, improve performance, and help secure and optimize the AWS backend infrastructure. Key Responsibilities Review and understand the existing React/Node.js codebase Fix existing frontend and backend bugs Improve marketplace functionality and user experience Work on multi-language and localization-related issues Fix API and database-related issues Improve backend performance, reliability, and scalability Review and improve AWS infrastructure and deployment Identify and resolve security and configuration issues Optimize server, database, and API performance Test fixes thoroughly and ensure existing features continue to work Help prepare the MVP for a stable production launch Required Technical Skills React.js Node.js JavaScript/TypeScript REST APIs PostgreSQL AWS AWS deployment, server configuration, and troubleshooting Git/GitHub Strong debugging and problem-solving skills Ideal Candidate We are looking for a senior developer, not someone who only fixes individual bugs. You should be comfortable taking ownership of an existing application, understanding its architecture, finding the root cause of issues, and recommending technical improvements. Experience with marketplaces, SaaS products, multi-language applications, and AWS infrastructure will be a strong advantage. Please include examples of similar React/Node.js projects you have worked on, especially projects involving AWS and marketplace platforms. Full-Stack Development Web Development Front-End Development