Fix & Ship Mobile App Updates (ASP.NET Core, Flutter, PostgreSQL, Firebase)
Budget: $25 – $50 USD
We need a senior developer (freelancer or agency) to fix critical issues and deliver production-ready updates for a mobile-first app.
Tech stack
- Backend: ASP.NET Core Web API (C#)
- Database: PostgreSQL
- Realtime/chat: Firebase Firestore
- Mobile: Flutter
- Web/admin: React (nice-to-have)
Must deliver (priority scope)
- Password reset emails not delivered: diagnose provider/config/deliverability and make it reliable.
- CV/PDF download shows “success” but file does not download/open: fix file storage + delivery flow (streaming or signed URL) and correct response headers.
- Payment flow redirects/loops and the app cannot return after payment: fix return URL/deep link/callback handling and make the flow consistent.
- Performance: Improve response times using pagination, indexes, query optimization, payload reduction, caching if needed.
- Localization (Czech + English): no English visible in Czech mode anywhere (strings, dropdowns, chips, statuses, notifications). Use stable IDs for reference data (countries, languages, zodiac, roles). Fix formatting for dates and salary/currency. Localize notifications including relative time.
Release
- After fixes, ship updated builds: Google Play + Apple App Store submission-ready. If store account owner actions are required, provide a step-by-step checklist and support us through submission.
How we start (mandatory)
Paid audit-first (2–4 hours):
- confirm backend + Flutter app run locally
- list missing access items needed (env vars, DB, Firebase, email, payments, signing)
- root cause findings + fix plan for each priority item
- execution timeline and milestones
* You must be comfortable working across backend + Flutter and delivering store-ready builds.
In your proposal, include:
- evidence of ASP.NET Core + PostgreSQL performance tuning
- experience with Flutter releases (Play Store + App Store)
- examples of payment deep link/return fixes and file download fixes (PDF)
- timezone and availability for next 7–14 days
- whether you are solo or agency and who covers backend vs Flutter
Tech stack
- Backend: ASP.NET Core Web API (C#)
- Database: PostgreSQL
- Realtime/chat: Firebase Firestore
- Mobile: Flutter
- Web/admin: React (nice-to-have)
Must deliver (priority scope)
- Password reset emails not delivered: diagnose provider/config/deliverability and make it reliable.
- CV/PDF download shows “success” but file does not download/open: fix file storage + delivery flow (streaming or signed URL) and correct response headers.
- Payment flow redirects/loops and the app cannot return after payment: fix return URL/deep link/callback handling and make the flow consistent.
- Performance: Improve response times using pagination, indexes, query optimization, payload reduction, caching if needed.
- Localization (Czech + English): no English visible in Czech mode anywhere (strings, dropdowns, chips, statuses, notifications). Use stable IDs for reference data (countries, languages, zodiac, roles). Fix formatting for dates and salary/currency. Localize notifications including relative time.
Release
- After fixes, ship updated builds: Google Play + Apple App Store submission-ready. If store account owner actions are required, provide a step-by-step checklist and support us through submission.
How we start (mandatory)
Paid audit-first (2–4 hours):
- confirm backend + Flutter app run locally
- list missing access items needed (env vars, DB, Firebase, email, payments, signing)
- root cause findings + fix plan for each priority item
- execution timeline and milestones
* You must be comfortable working across backend + Flutter and delivering store-ready builds.
In your proposal, include:
- evidence of ASP.NET Core + PostgreSQL performance tuning
- experience with Flutter releases (Play Store + App Store)
- examples of payment deep link/return fixes and file download fixes (PDF)
- timezone and availability for next 7–14 days
- whether you are solo or agency and who covers backend vs Flutter