01 .NET Backend & Architecture
Freelance .NET backend engineer & software architect
I design, build and modernise .NET backends: ASP.NET Core APIs, background services and integrations that stay fast and maintainable in production. Typical engagements are getting a stuck backend moving again, untangling a legacy system step by step, or setting up a new service landscape properly from day one.
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Typical problems I get called in for
- 01
The legacy system cannot scale
An older .NET Framework or monolithic application blocks new features. I modernise it incrementally, without a risky big-bang rewrite.
- 02
Integrations keep breaking
Third-party APIs, internal services and data flows fail in ways nobody fully understands. I trace the root cause and make the contracts explicit.
- 03
A new product needs a solid backend fast
You need APIs, auth and data access that hold up under real users, not a prototype that has to be rewritten in six months.
- 04
Performance problems in production
Slow endpoints, database bottlenecks or memory pressure. I measure first, then fix what actually matters.
What you get
Tools and technologies
- C#
- .NET
- ASP.NET Core
- Entity Framework Core
- REST APIs
- Real-time endpoints
- Background workers
- Messaging
- Auth flows
- Unit & integration tests
- 01 Architecture review with a prioritised, written roadmap
- 02 ASP.NET Core APIs, workers and real-time endpoints
- 03 Data layer with Entity Framework Core and clean domain models
- 04 Authentication and authorisation flows across services
- 05 Automated tests and performance checks for safer releases
- 06 Documentation and hand-over so your team owns the result
.NET Backend & Architecture
Frequently asked questions
Can you modernise an existing .NET Framework application?
Yes. I migrate step by step to modern .NET: first stabilising and covering critical paths with tests, then moving modules behind clear interfaces. The system keeps running in production during the whole migration.
Do you join existing teams or work independently?
Both. I can take full ownership of a backend, or join your team, adapt to your conventions and review process, and leave behind code your developers are comfortable maintaining.
What does a freelance .NET engineer cost?
It depends on scope and duration. Ongoing support is billed on a daily or hourly rate; clearly scoped work can be a fixed price. After a free intro call you get a written estimate before any work starts.