I will fix bugs, debug and upgrade your existing software or web app

B
bartoszwitek29
B
bartoszwitek29
Bartosz W
fix bugs, debug and upgrade your existing software or web app
Full Screen
fix bugs, debug and upgrade your existing software or web app

About this gig

Got software that's broken, buggy, or left behind by a developer who's no longer around? I'll get it working again.


What I can help with: finding and fixing bugs, crashes and errors; picking up unfinished or abandoned projects; upgrading outdated code, libraries and frameworks; adding new features to existing apps; and database issues (SQL, MySQL, Oracle, MongoDB).


Languages and tools: C#/.NET, Java, Python, PHP, JavaScript/TypeScript, Node.js, Express, Angular, HTML/CSS.


How it works: message me with a description of the problem and access to the code. I review it and confirm I can fix it and which package fits. Then I fix it, test it, and explain what I changed.


I'm currently completing a BSc (Hons) in Computing with Software Development at MTU Kerry, and I've done work for organisations including Meals on Wheels as well as individual clients.


Please message me before ordering so I can check your project first.

  • Programming language

    • C#

  • Expertise

    • Debugging
    • Performance
    • Databases
    • Source control
    • Testing procedures

  • Frontend framework

    • Angular

  • Backend framework

    • Express.js
    • Node.js

Get to know Bartosz W

Bartosz W

Software Developer, Bug Fixing and Legacy Code Upgrades

  • FromPoland
  • Member sinceOct 2026
  • Avg. response time1 hour

  • Languages

    English
Software developer with 15+ years of hands-on computing experience, currently completing a BSc (Hons) in Computing with Software Development at MTU Kerry. I build, fix and upgrade software, especially projects where the original developer has moved on. I've done work for organisations including Meals on Wheels and many individual clients. Stacks: C#/.NET, Java, Python, PHP, JavaScript/TypeScript (Node, Express, Angular), SQL (Oracle, MySQL/MariaDB, MongoDB). Clear communication, tidy code, and fixes you'll understand.

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