I will fix bugs in your csharp asp net application or rest API

J
joaoguerreiro_
J
joaoguerreiro_
Joao Guerreiro
fix bugs in your csharp asp net application or rest API
Full Screen
fix bugs in your csharp asp net application or rest API
Full Screen
fix bugs in your csharp asp net application or rest APIfix bugs in your csharp asp net application or rest API

About this gig

Need a bug fixed in your C# or ASP.NET application?

I help developers and small businesses quickly resolve issues in backend code and REST APIs.

What I can fix:

  • C# and ASP.NET bugs
  • REST API errors and unexpected behavior
  • SQL / database related issues
  • Small logic problems
  • Basic performance or error handling issues

Before you order, please send me a short description of the problem so I can confirm it fits the package.

I focus on clear communication, clean code and realistic delivery times.

  • Programming language

    • ASP.NET

  • Expertise

    • Algorithms & Data structures
    • Debugging
    • Performance
    • Databases
    • Source control

  • Frontend framework

    • Bootstrap
    • Flutter
    • React.js

  • Backend framework

    • FastAPI
    • Firebase
    • Spring Boot

Get to know Joao Guerreiro

Joao Guerreiro

Junior Backend Developer CSharp, Java Spring Boot, Docker

  • FromPortugal
  • Member sinceAug 2026
  • Avg. response time1 hour

  • Languages

    English, Portuguese
I'm a Computer Engineering graduate from Portugal with hands-on experience in software development and CI/CD. My experience includes C#, ASP.NET, REST APIs, SQL databases, Java, Spring Boot, and Docker. I worked on web applications, backend APIs, containerized applications, and pipeline automation. I enjoy solving technical problems, debugging code, building backend features, and helping applications run reliably. I communicate in Portuguese and English, and I focus on clean, maintainable code, clear communication, and realistic deadlines.

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