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I will develop secure rest API integrations and backend in dotnet
Daan
About this gig
Need a reliable backend developer to build REST APIs, integrate external services, or improve your existing application?
I am a professional C#/.NET software developer with 5+ years of development experience, specializing in modern backend systems, API integrations, databases, and distributed applications.
Core tools: C#, ASP.NET Core, REST APIs, PostgreSQL, Stripe and payment gateway integrations.
What I can help you with:
- Custom REST API development using C# and ASP.NET Core
- Third-party API integrations
- New endpoints and backend functionality
- Entity Framework Core and database integration
- PostgreSQL, SQL Server, and MongoDB
- Authentication and authorization
- Webhooks and background processing
- Bug fixing, debugging, and optimization
- API documentation using Swagger / OpenAPI
- Docker and cloud-ready backend services
Technologies I work with:
C#, .NET, ASP.NET Core, Entity Framework Core, PostgreSQL, MongoDB, Redis, RabbitMQ, Kafka, Docker, and Microsoft Azure.
Why choose me?
I have hands-on professional experience building backend applications and integrations. I focus on clean, maintainable code, reliable error handling, and solutions that fit your existing architecture.
Get to know Daan
Daan
Dotnet Developer, Automation, Docker and Intune
- FromNetherlands
- Member sinceMay 2022
- Last delivery2 years
Languages
English, Dutch
Backend developer with 6 years of experience in IT and software development. I build custom C#/.NET REST APIs and integrations, automate business workflows with n8n, Make, Zapier and AI, containerize and deploy applications with Docker, and package Windows apps for Microsoft Intune. I focus on clean, maintainable, well-documented solutions you can rely on - and I'm happy to scope your project before you order. Message me to talk through what you need.
Other Software Development Services I Offer
FAQ
Which languages and frameworks do you use?
Mainly C#, .NET, ASP.NET Core and Entity Framework Core. I also work with PostgreSQL, SQL Server, MongoDB, Redis and Docker.
Can you work on my existing .NET application?
Yes. I can extend existing projects, add endpoints, integrate external systems, fix bugs and improve backend functionality.
Can you integrate third-party APIs?
Yes. I work with REST and GraphQL APIs, authentication, webhooks, request processing and data synchronization.
Do I receive the source code?
Yes. Every package includes the source code for the agreed development work.
Can you connect the API to a database?
Yes. I work with PostgreSQL, SQL Server, MongoDB and EF Core. Database work depends on the selected package.
Can you deploy my API?
Deployment assistance is available as an extra or through a custom offer.
Do you provide testing?
Yes. Functional testing is included within scope. Automated tests can be added depending on the project.
What if my project is larger than the packages?
Message me with your requirements and I'll send a custom offer for larger or more complex projects.
How do you handle data privacy and security?
I follow secure coding practices: input validation, authentication, parameterized queries, and secrets kept out of source control. I'm happy to sign an NDA on request and never share your code or data with anyone.
