Senior Full-Stack JavaScript Developer (React/Next.js + Node.js) – Bug Fixing

We are looking for an experienced Full-Stack JavaScript Developer to help us resolve several issues and implement minor improvements on an existing AI-powered customer support platform. The platform is already built and actively used. We need a developer who can quickly understand the existing codebase, identify root causes of issues, and deliver reliable fixes. This is initially a one-time project focused on bug fixing and stabilization. If the collaboration goes well, additional development tasks may follow. Responsibilities: - Investigate and fix existing frontend and backend bugs - Debug React / Next.js application issues - Resolve Node.js API and backend problems - Fix database-related issues where necessary - Improve application stability and performance - Deliver clean, production-ready code Required Qualifications: - 4+ years of commercial Full-Stack JavaScript development experience - Strong proficiency in React.js and/or Next.js - Strong experience with Node.js and TypeScript - Experience debugging complex web applications - Experience with REST APIs - Solid understanding of PostgreSQL - Experience with Git-based workflows - Strong problem-solving skills - Ability to work independently Preferred Qualifications: - Experience with OpenAI or other LLM integrations - Docker experience - AWS experience - Experience with SaaS platforms Tech Stack: - Next.js - React.js - Node.js - TypeScript - PostgreSQL - OpenAI API - Docker - AWS Project Scope: The platform is already developed and deployed. We need assistance fixing several identified issues and making minor improvements to existing functionality. When applying, please include: - Relevant experience - Similar projects - Availability - Hourly rate