I will fix aspnet core dotnet API backend and sql issues

D
dungphungdev
D
dungphungdev
DungPhung
fix aspnet core dotnet API backend and sql issues
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fix aspnet core dotnet API backend and sql issues
Full Screen
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fix aspnet core dotnet API backend and sql issuesfix aspnet core dotnet API backend and sql issuesfix aspnet core dotnet API backend and sql issues

About this gig

I will help you diagnose and fix ASP.NET Core, .NET API, backend, and SQL Server issues.

I have 14+ years of experience working with enterprise backend systems, APIs, databases, integrations, performance troubleshooting, and production support.

I can help with:

  • ASP.NET Core and .NET backend bugs
  • REST API errors and unexpected responses
  • SQL Server query and database issues
  • Performance and timeout problems
  • Dependency, configuration, and integration issues
  • Debugging application and database errors
  • Root cause analysis for production issues

My approach is practical: first understand the problem, identify the root cause, then apply the smallest reliable fix without unnecessary rewrites.

Please contact me before ordering if:

  • the issue affects multiple services
  • the project requires architecture changes
  • there are several unrelated bugs
  • you are unsure which package fits your issue

For the Basic package, I recommend one small and clearly defined issue. Standard and Premium are better for deeper investigation or multiple related backend problems.

Please provide the relevant source code, error details, logs, screenshots, reproduction steps, and environment information when possible.

  • Programming language

    • C#

  • Expertise

    • Debugging
    • Performance
    • Security
    • Databases
    • Testing procedures

  • Backend framework

    • Other

Get to know DungPhung

DungPhung

Senior Backend and Integration Engineer

  • FromVietnam
  • Member sinceSep 2026
  • Avg. response time1 hour

  • Languages

    Vietnamese, English
Senior Backend & Integration Engineer with 14+ years of experience in .NET, Python, APIs, databases, Docker, cloud, and enterprise systems. I help clients fix backend issues, integrate REST APIs and third-party services, improve performance, automate workflows, and modernize existing systems. My experience includes ASP.NET Core, C#, Python, FastAPI, SQL Server, PostgreSQL, Docker, AWS/Azure, microservices, Kafka, OpenAI API integration, and legacy .NET modernization. I focus on practical, reliable solutions and clear communication.

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