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I will audit fix and debug your mobile app or mvp with german precision
Jean App Dev
Top Rated
5,0
5,0
Les clients continuent de revenir ! reach_heroes possède de nombreux clients réguliers.
À propos de ce service
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)
Découvrez Jean App Dev
Jean App Dev
German Mobile App Development, Website Expert
Top Rated
- DeAllemagne
- Membre depuisjuin 2020
- Temps de réponse moy.1 heure
- Dernière commandeenviron 12 heures
Langues
Anglais, Allemand
Hello, I’m Jean — a German mobile app developer with 7+ years of experience in mobile app development, website development, Flutter apps, Supabase backnds, and SaaS platforms. I help startups and agencies turn ideas into secure, scalable MVPs and store-ready digital products. My work covers app architecture, UI/UX planning, API integrations, authentication, subscriptions, admin dashboards, automation, and AI-driven features. As a CTO-level freelancer, I focus on clean code, reliable performance, and European quality standards from concept to launch and post-launch support.
Mon 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.
Avis
5 avis concernant ce service
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Détails de la notation
- Niveau de communication avec le freelance
- Qualité de la livraison
- Valeur de la livraison
Trier par
Les plus pertinents
Y 
yourcamsound
Client récurrent
Allemagne
Wie immer klasse und super Zusammenarbeit! Professionell und zuverlässig.
4 000 $US et au-dessus de
Prix
7 semaines
Durée
Utile?G 
goerkem00
Client récurrent
Allemagne
Top, hat egal wie oft ich nach Revisionen gefragt habe alles erfüllt
200 $US-400 $US
Prix
3 semaines
Durée
Utile?L lennart_buenker
Client récurrent
Allemagne
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 $US-600 $US
Prix
3 jours
Durée
Utile?S senolsenocak525
Client récurrent
Allemagne
Super, jederzeit wieder.
1 000 $US-1 500 $US
Prix
13 jours
Durée
Utile?S schportling
Client récurrent
Allemagne
Eine tolle Arbeitsebene und noch immer eine fantastische Zusammenarbeit. Danke!
800 $US-1 000 $US
Prix
1 jour
Durée
Utile?
Avis
5 avis concernant ce service
| (5) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Détails de la notation
- Niveau de communication avec le freelance
- Qualité de la livraison
- Valeur de la livraison
Trier par
Les plus pertinents
Y yourcamsound
Client récurrent
Allemagne
Wie immer klasse und super Zusammenarbeit! Professionell und zuverlässig.
4 000 $US et au-dessus de
Prix
7 semaines
Durée
Utile?G goerkem00
Client récurrent
Allemagne
Top, hat egal wie oft ich nach Revisionen gefragt habe alles erfüllt
200 $US-400 $US
Prix
3 semaines
Durée
Utile?L lennart_buenker
Client récurrent
Allemagne
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 $US-600 $US
Prix
3 jours
Durée
Utile?S senolsenocak525
Client récurrent
Allemagne
Super, jederzeit wieder.
1 000 $US-1 500 $US
Prix
13 jours
Durée
Utile?S schportling
Client récurrent
Allemagne
Eine tolle Arbeitsebene und noch immer eine fantastische Zusammenarbeit. Danke!
800 $US-1 000 $US
Prix
1 jour
Durée
Utile?
