Full Stack Developer Needed to Fix Bugs in Web Application

We’re looking for an experienced Full Stack Developer to identify and fix several bugs in our existing web application. The app is live, and we need someone who can quickly understand the codebase, debug issues, and deliver clean, tested fixes. Current issues include: Frontend UI elements not rendering correctly on some screens and devices API calls failing or returning incorrect data in certain cases Login/authentication session issues (users getting logged out randomly) Form validation and data submission errors Slow page load and performance issues on a few pages What you’ll do: Review the codebase and reproduce the reported bugs Find the root cause, not just patch the symptom Fix the issues on both frontend and backend Test each fix so nothing else breaks Share a short summary of what was fixed and why Tech stack: Frontend: React.js / Next.js Backend: Node.js / Express Database: MongoDB / MySQL Hosting: AWS / Vercel Version control: GitHub Requirements: 3+ years of full-stack development experience Strong debugging and problem-solving skills Experience working with existing codebases written by other developers Clear communication and regular progress updates Available to start immediately To apply: Start your proposal with the word “DEBUG” so we know you read the full post. Briefly share a similar bug-fixing project you’ve done, and how you would approach fixing an authentication session issue.