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
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MR
Mauricio R.
Jul 28, 2026
Flutter Mobile App & Website Development from Figma Design
Working with Alexis was a great experience. He not only did the work as requested but also made suggestions to improve the app based on his previous experience. We will definitely work with him again in future projects.
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
About Alexis
Flutter Developer | iOS, Android & Firebase | 11+ Years
100%
Job Success
Quito, Ecuador - 10:59 pm local time
I work directly with founders and businesses to build, fix, launch, and maintain production-ready digital products. Mobile development is my specialty, with supporting experience in web platforms, backend systems, and integrations.
Selected proof:
• 101 apps of my own and 30+ client projects
• 130+ mobile projects overall
• 1.4M+ combined downloads
• TOP RATED with 100% Job Success
• $100K+ earned, 20 Upwork jobs, and 4,298 hours
• 11+ years developing software since 2015
I can help with:
• Flutter, iOS, and Android development
• Existing-app audits, rescue, bug fixing, and migrations
• Firebase, REST APIs, backend integrations, and web admin panels
• In-app purchases, subscriptions, payments, and AdMob
• App Store and Google Play submission or rejection fixes
• Maintenance, API updates, performance, and real-device testing
How I work:
1. You share the app, codebase, requirements, or idea.
2. I review the scope, risks, and priorities.
3. You receive a clear estimate, milestones, and delivery plan.
4. I deliver working builds with direct communication throughout the project.
You work directly with the developer responsible for the result. No account manager and no outsourced handoffs.
Send me a message with the current stage of your product and what you need to accomplish. I will help you identify the clearest next step.
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.