I will audit fix and debug your mobile app or mvp with german precision


Top Rated
1 order in queue
About this gig
I will analyze, debug, and fix issues in your mobile app to ensure it runs smoothly, reliably, and as expected.
If your app is crashing, behaving incorrectly, or stuck due to bugs, I help you identify the root cause and fix the problem properly without introducing new issues or temporary workarounds.
I work in a structured and transparent way, focusing on stability, maintainability, and long-term quality rather than quick hacks.
What I can help you with:
- App crashes and runtime errors
- Broken features or unexpected behavior
- Build and deployment issues
- Performance and stability problems
- API or backend integration bugs
- UI or logic issues
- Code cleanup and bug isolation
Platforms & technologies:
- Flutter
- Android (Java / Kotlin)
- iOS (Swift)
This service is ideal for:
- Apps that crash or behave incorrectly
- MVPs that need stabilization
- Apps rejected by App Store or Play Store due to bugs
- Founders or teams who need a reliable fix
️ Important notes:
- This gig is for bug fixing and debugging only
- New features are not included
- Scope depends on issue complexity
- Source code access is required
Please contact me before ordering and briefly describe:
- The issue
- Platform (Flutter / Android / iOS)
Get to know Jean App Dev
German Mobile App Development, Web App Expert
Top Rated
- FromGermany
- Member sinceJun 2020
- Avg. response time5 hours
- Last delivery2 days
Languages
English, German
My Portfolio
FAQ
What kind of mobile apps do you work with?
I work with Flutter apps as well as native Android (Java/Kotlin) and iOS (Swift) applications.
Do you fix apps that you didn’t build yourself?
Yes. I regularly debug and fix apps developed by other developers or teams.
What types of issues can you fix?
I can fix crashes, runtime errors, broken features, performance issues, API or backend integration bugs, UI/logic problems, and build or deployment errors.
Do you add new features or functionality?
No. This gig focuses strictly on bug fixing and debugging. New features can be discussed as a separate project.
Do you need access to my source code?
Yes. Access to the source code (GitHub, GitLab, Bitbucket, or ZIP file) is required to properly analyze and fix the issue.
How do you ensure the quality of the app?
I follow best practices in Flutter App Development, including thorough testing, optimization for performance, and a focus on a user-friendly design to ensure your app meets the highest quality standards.
4 reviews for this Gig
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
L lennart_buenker
Repeat Client

Germany
Jean's work is - as always - jsut great. He answers fast. He understands my needs. I started to work with Jean about 1 year ago. Since then he not only created exactly the APP I wanted, he also extended the APP whenever I needed it done. Apart from that he has supported me several times with some additional stuff like databases. 100% reccomondation here
$400-$600
Price
3 days
Duration
Helpful?G 
goerkem00
Repeat Client

Germany
Top, hat egal wie oft ich nach Revisionen gefragt habe alles erfüllt
$200-$400
Price
3 weeks
Duration
Helpful?S senolsenocak525
Repeat Client

Germany
Super, jederzeit wieder.
$1,000-$1,500
Price
13 days
Duration
Helpful?S schportling
Repeat Client

Germany
Eine tolle Arbeitsebene und noch immer eine fantastische Zusammenarbeit. Danke!
$800-$1,000
Price
1 day
Duration
Helpful?
4 reviews for this Gig
| (4) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
L lennart_buenker
Repeat Client

Germany
Jean's work is - as always - jsut great. He answers fast. He understands my needs. I started to work with Jean about 1 year ago. Since then he not only created exactly the APP I wanted, he also extended the APP whenever I needed it done. Apart from that he has supported me several times with some additional stuff like databases. 100% reccomondation here
$400-$600
Price
3 days
Duration
Helpful?G 
goerkem00
Repeat Client

Germany
Top, hat egal wie oft ich nach Revisionen gefragt habe alles erfüllt
$200-$400
Price
3 weeks
Duration
Helpful?S senolsenocak525
Repeat Client

Germany
Super, jederzeit wieder.
$1,000-$1,500
Price
13 days
Duration
Helpful?S schportling
Repeat Client

Germany
Eine tolle Arbeitsebene und noch immer eine fantastische Zusammenarbeit. Danke!
$800-$1,000
Price
1 day
Duration
Helpful?
