You will get Entity Framework Core and SQL issues fixed in your .NET app
Rising Talent
Project details
Are you experiencing Entity Framework Core, SQL Server, PostgreSQL, or database-related problems in your .NET application?
I can help investigate the issue, identify the root cause, and implement a reliable fix while keeping changes focused and maintainable.
I have 5 years of professional experience developing .NET backend systems using Entity Framework Core, SQL Server, PostgreSQL, LINQ, Dapper, REST APIs, and enterprise database-driven applications.
I can help with:
• Entity Framework Core errors
• Entity tracking issues
• Entity relationships
• LINQ queries
• Slow database queries
• SQL errors
• SQL Server
• PostgreSQL
• Insert/update/delete issues
• Duplicate key and constraint problems
• Database migrations
• Data consistency issues
• Repository and DbContext problems
• Query optimization
My approach is to reproduce the issue first, inspect both application and database behavior, determine the actual root cause, and then implement the smallest reliable solution.
Please contact me before ordering if the issue involves significant database redesign, large data migrations, or an unclear scope.
I can help investigate the issue, identify the root cause, and implement a reliable fix while keeping changes focused and maintainable.
I have 5 years of professional experience developing .NET backend systems using Entity Framework Core, SQL Server, PostgreSQL, LINQ, Dapper, REST APIs, and enterprise database-driven applications.
I can help with:
• Entity Framework Core errors
• Entity tracking issues
• Entity relationships
• LINQ queries
• Slow database queries
• SQL errors
• SQL Server
• PostgreSQL
• Insert/update/delete issues
• Duplicate key and constraint problems
• Database migrations
• Data consistency issues
• Repository and DbContext problems
• Query optimization
My approach is to reproduce the issue first, inspect both application and database behavior, determine the actual root cause, and then implement the smallest reliable solution.
Please contact me before ordering if the issue involves significant database redesign, large data migrations, or an unclear scope.
Programming Languages
JavaScript, ASP.NET, C#Coding Expertise
Performance OptimizationWhat's included
| Service Tiers |
Starter
$20
|
Standard
$60
|
Advanced
$120
|
|---|---|---|---|
| Delivery Time | 1 day | 2 days | 3 days |
Number of Revisions | 1 | 2 | 2 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Additional Revision
+$10Frequently asked questions
About Phu
C# / ASP.NET Core Backend Developer | REST API | EF Core | Bug Fixing
Hanoi, Vietnam - 6:50 pm local time
I help clients build, maintain, troubleshoot, and improve .NET applications, especially when they need someone who can quickly understand an existing codebase and solve problems without introducing unnecessary complexity.
What I can help you with:
- Build REST APIs using ASP.NET Core
- Debug and fix existing C#/.NET applications
- Fix Entity Framework Core and database issues
- Design and optimize SQL Server/PostgreSQL queries
- Implement authentication and authorization with JWT
- Develop business logic and backend services
- Maintain and extend existing .NET codebases
- Refactor legacy or complex backend code
- Design database models and relationships
- Integrate third-party APIs and services
- Implement background jobs and scheduled processing
- Work with Microservices and distributed systems
- Dockerize and deploy .NET applications
Technologies I work with:
Backend
C#, .NET Core, .NET 8, .NET 9, ASP.NET Core, REST API, ABP Framework, Entity Framework Core, Dapper
Architecture
Clean Architecture, DDD, SOLID, Microservices, Repository Pattern, Dependency Injection
Database
SQL Server, PostgreSQL, Redis
Integration & Messaging
RabbitMQ, REST API, gRPC, Firebase Cloud Messaging
Background Processing & Workflow
Hangfire, Elsa Workflow, Camunda
Development Tools
Git, GitHub, GitLab, Swagger, Postman, Serilog
DevOps
Docker, Docker Compose, Linux, GitLab CI/CD, GitHub Actions, Jenkins, AWS EC2, AWS S3
I have worked on enterprise systems including investment portfolio management, business planning and approval systems, HR applications, e-invoice systems, reporting systems, and data-processing applications.
I’m comfortable joining an existing project, understanding its architecture, investigating issues independently, identifying root causes, and implementing focused solutions.
I’m currently building my reputation on Upwork, but I bring 5 years of professional .NET development experience. My goal is to build long-term trust here through reliable communication, clean implementation, and high-quality work.
If you have a C#/.NET backend issue, an API that needs fixing, or an existing application that needs maintenance or new functionality, feel free to contact me.
Steps for completing your project
After purchasing the project, send requirements so Phu can start the project.
Delivery time starts when Phu receives requirements from you.
Phu works on your project following the steps below.
Revisions may occur after the delivery date.
Review the database issue
I will review the code, Entity Framework configuration, SQL queries, database structure, logs, and reported behavior.
Reproduce and diagnose
I will reproduce the problem and investigate EF Core tracking, relationships, LINQ queries, generated SQL, constraints, and database behavior.