You will get Flutter App Bug Fixing, Code Review & Performance Optimization
Top Rated
Project details
Is your Flutter app crashing, throwing errors, or behaving unexpectedly? I specialize in diagnosing and fixing all types of Flutter bugs — from UI glitches and state management issues to API failures, build errors, and performance problems.
With 5+ years of Flutter development experience, I've fixed hundreds of issues across apps on the App Store and Google Play. I work with all Flutter versions and popular packages including Provider, Riverpod, GetX, Bloc, Firebase, Dio, and more.
What you get:
✅ Root cause analysis for every bug — not just a quick patch
✅ Clean, well-commented fixes following Flutter best practices
✅ Testing on Android and iOS before delivery
✅ Full source code + detailed change summary
✅ Fast turnaround — most fixes delivered within the agreed timeline
Whether it's 1 bug or 20, I'll get your app running smoothly. Share your project and let's fix it.
With 5+ years of Flutter development experience, I've fixed hundreds of issues across apps on the App Store and Google Play. I work with all Flutter versions and popular packages including Provider, Riverpod, GetX, Bloc, Firebase, Dio, and more.
What you get:
✅ Root cause analysis for every bug — not just a quick patch
✅ Clean, well-commented fixes following Flutter best practices
✅ Testing on Android and iOS before delivery
✅ Full source code + detailed change summary
✅ Fast turnaround — most fixes delivered within the agreed timeline
Whether it's 1 bug or 20, I'll get your app running smoothly. Share your project and let's fix it.
Platform
AndroidApp Type
Native AppDevelopment Technology
FlutterApp Purpose
Finance, Health & Fitness, Medical, Productivity, Social NetworkingExpertise
Cross Browser & Device Compatibility, Performance OptimizationWhat's included
| Service Tiers |
Starter
$199
|
Standard
$349
|
Advanced
$549
|
|---|---|---|---|
| Delivery Time | 3 days | 5 days | 7 days |
Number of Revisions | 0 | 0 | 0 |
Bug Investigation | |||
Fix Documentation |
Frequently asked questions
6 reviews
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FN
Freddy N.
Oct 18, 2025
Migrate an app from Flutter 2.12.0 to Flutter 3.16.3
EO
Eduardo O.
Nov 8, 2024
Flutter Developer for Huawei App Gallery
Requested work successfully completed. Good communication and attentive to detail.
SA
Scott A.
Feb 24, 2023
Audit my mobile app flutter code and help me create app bundles for the App Store & Play Store
I hired Alexis to audit a mobile app that I had hired someone else to develop originally. I also had Alexis help me get the app published on the app stores. He was fantastic to work with throughout the entire process! In addition to completing the requests I had, he also pointed out additional items that needed fixed in the app. He is very knowledgeable about the app publishing procedures, and guided me through the process. The app uses flutter and firebase, and he was clearly knowledgeable with both. I highly recommend working with Alexis!
TH
Thomas H.
Apr 29, 2022
Flutter developer
NM
Nancy M.
Apr 13, 2021
Flutter/Dart Developer
We have a great experience with Alexis. He is a great professional, and tech savvy.
About Alexis
Flutter Developer | iOS & Android | Firebase | Dart | BLoC | 10+ Years
100%
Job Success
Quito, Ecuador - 10:33 pm local time
Your app deserves more than working code. It deserves a developer who has shipped 80+ real products to the App Store and Google Play — with 1.4M+ combined downloads and users who keep coming back.
That's what I bring to every project.
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🚀 WHAT I BUILD
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• Cross-platform Flutter apps (iOS & Android) from zero to published
• Firebase-powered backends — Auth, Firestore, Cloud Functions, FCM
• Social & dating apps, marketplaces, medical platforms, fintech, e-commerce
• Flutter migrations (2.x → 3.x), performance optimization, code audits
• App Store & Google Play publishing, including Huawei AppGallery
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🛠 TECH STACK
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Flutter · Dart · Firebase · iOS · Android · REST APIs · BLoC / Provider / Riverpod · Figma · Git · AWS · Google Maps SDK · AdMob · FCM
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📌 WHY CLIENTS COME BACK
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✔ I own the project, not just the task
✔ Clear communication — you'll always know where things stand
✔ Building mobile apps since before Flutter existed
✔ 100% Job Success Score across 19 contracts on Upwork
"Requested work successfully completed. Good communication and attentive to detail."
"He is a great professional, and tech savvy."
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🤝 LET'S BUILD SOMETHING
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If you need a Flutter developer who delivers — not just promises — send me a message. I respond within 4 hours and I'm available now.
Steps for completing your project
After purchasing the project, send requirements so Alexis can start the project.
Delivery time starts when Alexis receives requirements from you.
Alexis works on your project following the steps below.
Revisions may occur after the delivery date.
Bug Analysis & Reproduction
I review your source code, reproduce every reported bug locally, and document the exact root cause of each issue before writing a single line of fix.
Fix Implementation
I apply clean, well-commented fixes following Flutter and Dart best practices. Each fix is isolated so it doesn't break other parts of your app.