I will fix bugs and add features to your android mobile app

D
devk_jason
D
devk_jason
Quoc Khanh
fix bugs and add features to your android mobile app
Full Screen
fix bugs and add features to your android mobile app
Full Screen
Full Screen
fix bugs and add features to your android mobile appfix bugs and add features to your android mobile appfix bugs and add features to your android mobile app

About this gig

Is your Android app crashing, freezing, or misbehaving? I'll find the bug and fix it fast and clean.


I'm a Senior Mobile Developer with 8+ years of experience building native Android apps in Java and Kotlin, including banking apps trusted by 100K to 2M+ users. I work directly with your codebase: no middlemen, no delays.


What I can do for you:

- Fix crashes (NullPointerException, ANRs), UI glitches, and unexpected behavior

- Resolve issues with APIs, Firebase, Room, Retrofit, and third-party SDKs

- Add new features or small modules to your existing app

- Clean up messy code so future updates are painless


How it works (chat only):

1. You describe the bug or feature and share access to the code (GitHub/GitLab/zip).

2. I reproduce the issue, then confirm the scope and timeline with you.

3. I fix it, test it, and send it back with a short summary of what changed.


You always know what's happening I reply fast and explain clearly, no jargon.


Note: I work by chat only (no video/audio calls). Screen recordings and code snippets work great for showing me the problem.


Let's get your app running smoothly again send me a message!


  • App type

    • Native

  • Purpose

    • Custom

  • Expertise

    • Performance
    • Data storage
    • Firebase
    • API integration

  • Programming language

    • Java
    • Kotlin

  • Frameworks

    • Jetpack Compose
    • Android

  • Tools

    • Android Studio

Get to know Quoc Khanh

Quoc Khanh

Senior Mobile App Developer, Flutter and React Native

  • FromVietnam
  • Member sinceAug 2021

  • Languages

    English, Vietnamese
Senior Full-Stack Developer with 8+ years of experience building cross-platform mobile apps with Flutter and React Native, plus backend and frontend web development with Node.js, React/Next.js, and Firebase. I have shipped production apps used by 100K to 2M+ users, including banking apps at iBank Cambodia and MSB Vietnam, across domains such as e-commerce, sales, ordering, warehouse management, reporting, utilities, and blockchain. I'm a responsible team player who communicates clearly in English and delivers clean, well-tested code on schedule. Let's work together!

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