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

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Jean App Dev

Top Rated

1 order in queue

5.0
5.0

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

Jean App Dev

German Mobile App Development, Web App Expert

5.0(277)

Top Rated

  • FromGermany
  • Member sinceJun 2020
  • Avg. response time5 hours
  • Last delivery2 days
  • Languages

    English, German
Hello, I’m Jean — a German mobile app developer with 7+ years of experience in mobile app development and web-based SaaS platforms. I build Flutter apps, Supabase backends, and AI-driven solutions that meet European quality standards. As a CTO-level freelancer, I help startups and agencies launch MVPs, automate workflows, and scale securely. Based in Germany, I deliver modern, high-performance apps from concept to store-ready release.

My Portfolio

Reviews

4 reviews for this Gig
5.0

(4)
(0)
(0)
(0)
(0)
Rating Breakdown
  • Seller communication level
    5
  • Quality of delivery
    5
  • Value of delivery
    5
Sort By
Most relevant
  • L

    lennart_buenker

    Repeat Client

    DE

    Germany

    5

    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?
    Yes
    No
  • G
    image-docs

    goerkem00

    Repeat Client

    DE

    Germany

    5

    Top, hat egal wie oft ich nach Revisionen gefragt habe alles erfüllt

    $200-$400

    Price

    3 weeks

    Duration

    Helpful?
    Yes
    No
  • S
    image-docs

    senolsenocak525

    Repeat Client

    DE

    Germany

    5

    Super, jederzeit wieder.

    $1,000-$1,500

    Price

    13 days

    Duration

    Helpful?
    Yes
    No
  • S

    schportling

    Repeat Client

    DE

    Germany

    5

    Eine tolle Arbeitsebene und noch immer eine fantastische Zusammenarbeit. Danke!

    $800-$1,000

    Price

    1 day

    Duration

    Helpful?
    Yes
    No
Reviews

4 reviews for this Gig
5.0

(4)
(0)
(0)
(0)
(0)
Rating Breakdown
  • Seller communication level
    5
  • Quality of delivery
    5
  • Value of delivery
    5
Sort By
Most relevant
  • L

    lennart_buenker

    Repeat Client

    DE

    Germany

    5

    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?
    Yes
    No
  • G
    image-docs

    goerkem00

    Repeat Client

    DE

    Germany

    5

    Top, hat egal wie oft ich nach Revisionen gefragt habe alles erfüllt

    $200-$400

    Price

    3 weeks

    Duration

    Helpful?
    Yes
    No
  • S
    image-docs

    senolsenocak525

    Repeat Client

    DE

    Germany

    5

    Super, jederzeit wieder.

    $1,000-$1,500

    Price

    13 days

    Duration

    Helpful?
    Yes
    No
  • S

    schportling

    Repeat Client

    DE

    Germany

    5

    Eine tolle Arbeitsebene und noch immer eine fantastische Zusammenarbeit. Danke!

    $800-$1,000

    Price

    1 day

    Duration

    Helpful?
    Yes
    No