I will do bugfix appliction development

L
ludwigkral
L
ludwigkral
Ludwig Karl
do bugfix appliction development
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do bugfix appliction development

About this gig

Need help with a software bug that is blocking your project?



I will investigate and fix one reproducible bug in your application, website, API, script, or automation workflow. I work with C, Python, Java, TypeScript/JavaScript, React, Next.js, Vue, Node.js, FastAPI, NestJS, Spring, Flutter, and related tools.



What you can expect:


- Root-cause analysis


- A focused code fix


- Verification of the affected workflow


- A clear summary of what changed


- Documentation or detailed comments when included in the package



Please message me before ordering with the error message, expected behavior, reproduction steps, relevant code or repository access, environment details, and deadline. I do not accept malware, credential theft, unauthorized access, or academic cheating requests.

  • Programming language

    • JavaScript

  • Expertise

    • Algorithms & Data structures
    • Debugging
    • Localization
    • Performance
    • Security

  • Frontend framework

    • Flutter
    • Next.js
    • React.js
    • Tailwind CSS
    • Vue.js

  • Backend framework

    • FastAPI
    • NestJS
    • Next.js
    • Node.js
    • Spring

Get to know Ludwig Karl

Ludwig Karl

FullStack Engineer

  • FromChina
  • Member sinceMar 2026
  • Avg. response time1 hour

  • Languages

    English, Chinese, German
I build end-to-end solutions across the full stack, from AI applications to embedded firmware. I am fluent in Java, Python, C, and C++. I offer binary analysis and reverse engineering for security research and malware analysis. I deliver clean, production-ready results.

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