Browse categories
Explore
Fiverr Pro
English
$
USD
I will fix dot net bugs, optimize sql queries, and troubleshoot c sharp backend
Manuel Lopez
About this gig
Are you facing production bottlenecks, breaking bugs, or performance issues in your .NET application? I am here to help you solve them fast.
As a Senior Software Engineer with over 7 years of hands-on experience in the .NET ecosystem, I specialize in diving deep into existing codebases, finding the root cause of complex errors, and implementing clean, scalable fixes.
What I can do for you:
- Bug Fixing: Resolve C# runtime errors, API crashes, and dependency injection issues.
- SQL Optimization: Speed up slow database queries, fix deadlocks, and optimize SQL Server database structures.
- Backend & API Troubleshooting: Fix broken REST APIs, integration issues, and authentication/authorization errors.
- Bonus / Specialized Tech: Debugging Python scripts and Embedded Systems / IoT code (Raspberry Pi/Linux environments).
Why choose me?
- Seniority & Clean Code: Professional approach to technical debt.
- Fast Turnaround: I understand production emergencies.
- AI-Augmented Efficiency: I leverage cutting-edge tools to diagnose and refactor rapidly.
Please message me before placing an order so we can review your technical requirements together.
Get to know Manuel Lopez
Manuel Lopez
Computer Engineer
- FromCosta Rica
- Member sinceMay 2026
Languages
Spanish, English
Computer Engineer and Systems Architect with 7+ years of experience designing, modernizing, and delivering production-grade software and real-world technical systems. Specialized in the .NET ecosystem, legacy modernization, and full-stack engineering, with a strong track record migrating large-scale applications from VB6, ASP Classic, and Clarion into modern C#/.NET platforms.
Strong expertise in C#, .NET Framework/.NET, SQL Server, ASP.NET, Angular, CI/CD pipelines, and automated testing.
FAQ
What do you need from me to start working on the fix?
I will need a clear description of the bug, any error logs or screenshots available, and access to the relevant source code (or the specific file/query) through GitHub, GitLab, or a secure zip file.
Can you work on live production environments securely?
Yes. As a Senior Engineer, I understand the sensitivity of production systems. We can arrange a secure environment handover, work on a staging/development branch first, or do a live debugging session if required.
What technologies do you specialize in for bug fixing?
My core expertise is the .NET ecosystem (C#, .NET Core, ASP.NET Core, Web APIs) and relational databases (Microsoft SQL Server). I also have hands-on experience troubleshooting Python scripts and embedded systems (Raspberry Pi).
