You will get Mobile app development bug fixing | flutter developer iOS Android
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Project details
I specialize in Mobile app development bug fixing, resolving crashes, performance issues and broken features across iOS and Android. As an experienced flutter developer, I diagnose and fix bugs fast — whether it's Flutter, Swift, Kotlin or React Native.
My bug fixing starts with an audit: I reproduce the issue, trace root causes, and deliver clean tested fixes. No band-aids — I fix the actual problem so it doesn't come back.
Common Mobile app development bug fixing I handle: app crashes, API failures, UI glitches, slow performance, Firebase issues, push notifications, authentication bugs, state management errors, and App Store or Google Play rejection fixes.
As a full stack developer, my bug fixing goes beyond the mobile layer. I trace issues through backend APIs, databases, and cloud functions to find where things break. This Mobile app development approach means faster resolution and fewer recurring bugs.
I handle legacy code stabilization and migration fixes across stacks. My experience in Mental health app development and Productivity app development means I understand complex architectures where bugs hide in edge cases.
Fast turnaround. Clean fixes. Production-tested.
My bug fixing starts with an audit: I reproduce the issue, trace root causes, and deliver clean tested fixes. No band-aids — I fix the actual problem so it doesn't come back.
Common Mobile app development bug fixing I handle: app crashes, API failures, UI glitches, slow performance, Firebase issues, push notifications, authentication bugs, state management errors, and App Store or Google Play rejection fixes.
As a full stack developer, my bug fixing goes beyond the mobile layer. I trace issues through backend APIs, databases, and cloud functions to find where things break. This Mobile app development approach means faster resolution and fewer recurring bugs.
I handle legacy code stabilization and migration fixes across stacks. My experience in Mental health app development and Productivity app development means I understand complex architectures where bugs hide in edge cases.
Fast turnaround. Clean fixes. Production-tested.
Platform
iOSApp Type
Native AppDevelopment Technology
Flutter, Kotlin, SwiftApp Purpose
AR, Chat, Dating, Delivery, Entertainment, Education, Health & Fitness, Medical, Productivity, Social NetworkingExpertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included $500
These options are included with the project scope.
$500
- Delivery Time 10 days
- Number of Revisions 3
47 reviews
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OY
Olena Y.
Apr 6, 2026
Mobile App Development for AI Fitness Coach (Flutter / iOS / Android MVP)
Oleg is amazing to work with. I am so happy I found a mobile developer who really cares about the product.He helped me refine the product idea so it is competitive in the market now. We talked a lot and even fixed the Figma design because Oleg during our first meetings noticed details that other designers and consultants missed. I started with a small scope first, and everything was fast, on time, and followed our plan.
I will definitely continue my mobile app development with Oleg and Olearis later. It is rare to find someone so professional who understands flutter app development so deeply. I am very glad such attentive developers exist.
I will definitely continue my mobile app development with Oleg and Olearis later. It is rare to find someone so professional who understands flutter app development so deeply. I am very glad such attentive developers exist.
DV
Digita V.
Mar 26, 2026
iOS App Verification and App Store Submission Help
Oleg is a lifesaver! I had a legacy Ionic app that faced serious compatibility issues with the current App Store requirements. While most would have given up, Oleg didn't. He found a way to adapt the old codebase, navigated all the technical hurdles, and successfully got the app published. He is incredibly persistent, diligent, and a true expert. If you have a complex technical challenge, Oleg is the person you want in your corner.
CC
Christoph C.
Mar 16, 2026
DartsHub MVP
Highly recommend Oleg and Olearis to anyone who is looking for an experienced team that doesnt just execute as briefed but proactively drives your project using best practice and long term scalability
SS
Sasha S.
Feb 23, 2026
Design a Kids Trivia App
Good response time and service
DC
Daniel C.
Jan 8, 2026
Android/iOS app development.
The project progressed, but billing transparency and verifiable proof of work for the hours logged were insufficient for my expectations.
About Oleg
Flutter Developer | Mobile Developer | Flutter Development iOS Android
100%
Job Success
Lviv, Ukraine - 12:23 pm local time
I'm a founder and mobile product engineer, not just a coder for hire. I've launched my own apps, so I understand the founder side - budget pressure, unclear scope, investor expectations, App Store deadlines, and the nervous moment real users first touch the product. I'll tell you when something is a bad idea before it burns your budget.
Where I create the most value:
▪️ Flutter, done right - clean architecture, smooth 60 FPS UI, native
integrations, payments, push, analytics, and full App Store / Google Play
launch support. Cross-platform means you don't pay to build the same app twice.
▪️ AI agents that earn their place - AI assistants, smart onboarding,
personalization, recommendations, and context-aware journeys. In modern apps,
a good agent is often the reason users come back, not just a trendy add-on.
▪️Full-stack support - Node.js, Python, FastAPI, Firebase, REST APIs, cloud
functions, admin dashboards. Fewer handoffs, faster decisions. When a product
needs native depth, I also work in Swift (iOS) and Kotlin (Android).
Industries where I go deep:
Mental health apps, where trust, privacy, and calm UX matter as much as code. And productivity apps - habit loops, reminders, streaks, and smart automations that help users take the next useful action without friction.
A few products I've shipped:
✔️ UpLife - mental health app with AI assistant & therapy recommendations.
1M+ users, 4.8⭐️
✔️ Parlor - social audio platform scaled to 10M+ users.
✔️ GoFrendly - social network for women. 450K+ users, $2.88M raised.
✔️ Notate - secure productivity app trusted by Bank of America, Citibank,
and 80+ companies.
✔️ Fillrr - AI-powered document app, 4.9⭐️
Whether it's a two-week MVP or a long-term build, I care about shipping the right thing, not just more things. I respond in under 10 minutes during working hours.
If you need Flutter, React Native, or AI features from someone who has shipped real products at scale - send me the details and I'll tell you honestly what it'll take.
Steps for completing your project
After purchasing the project, send requirements so Oleg can start the project.
Delivery time starts when Oleg receives requirements from you.
Oleg works on your project following the steps below.
Revisions may occur after the delivery date.
write me first