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I will fix bugs API errors and deployment issues in your web app
Fujun Tan
About this gig
Is your web app failing at login, returning API errors, or refusing to build or deploy? I can investigate a reproducible issue and implement a focused fix.
I work across JavaScript and Node.js applications, backend services, databases, and Linux deployments. AI-generated projects are welcome if you can provide an editable codebase and reproduction steps.
This service can cover a broken API request, a login or session bug, a data handling error, or a build or deployment configuration problem.
You receive the agreed code or configuration changes, a short explanation of the cause, and steps to verify the fix. Work is done in a development or staging environment by default.
Please message me before ordering with the issue, stack, error output, and expected behavior so we can confirm scope. Each package covers the agreed issue in one codebase. Full app development, major migrations, security audits, paid hosting, and third-party service fees require separate scope.
Please redact secrets and personal data from screenshots and logs. Use temporary, limited-access credentials only if access is needed.
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Get to know Fujun Tan
Fujun Tan
Full Stack and Android Developer
- FromChina
- Member sinceOct 2026
Languages
Chinese, English
I am a full-stack developer and technical lead with over 10 years of software engineering experience. My background includes Android engineering at Baidu and Meizu, backend microservices, APIs, and production deployments. I work with Java, Kotlin, Go, Python, JavaScript, Node.js, MySQL, Linux, and Kubernetes. I investigate reproducible bugs, implement focused fixes, and explain how to verify them. I value clear requirements, practical solutions, and maintainable code. Please message me with your issue before ordering.
FAQ
Can you fix an AI-generated app?
Yes, if you can provide an editable codebase, reproduction steps, and any necessary test access. Please send the stack and issue before ordering so I can confirm whether it fits this service.
What does a revision cover?
A revision covers corrections to the agreed fix if it does not meet the acceptance criteria. New features, unrelated issues, and changes in scope require a separate quote.
Will you deploy directly to production?
Development or staging is the default. Production changes need a separate agreement covering access, approval, backups, and rollback.
