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Fiverr Pro
English
$
USD
I will build and extend your dotnet backend and rest apis
Dmitriy
About this gig
Need a new API endpoint, a third-party integration or a whole backend feature built properly? Send it over. No task is too small.
I'm a senior .NET backend developer with commercial experience in high-load, distributed systems: payments, authentication, third-party integrations. Your small task gets the same standards as a large production project.
What I do:
- Build and extend ASP.NET Core Web APIs and microservices
- Integrate third-party APIs (payments, webhooks, JWT/OAuth)
- EF Core / SQL: migrations and optimization
- Upgrade apps to the latest .NET
- Docker and CI/CD setup
- Background jobs, queues and caching
How I work:
- Fast replies, usually within a few hours
- Free short chat before you order: I'll say honestly if I can do it, how long it takes and which package fits
- Clean, readable code you can maintain
- Regular updates
- Free small tweaks after delivery
Not sure which package to pick? Message me a short description of your task.
Get to know Dmitriy
Dmitriy
Senior NET Engineer
- FromBelarus
- Member sinceOct 2026
Languages
English
I am a result-oriented Fullstack .NET & React Developer with over 6 years of experience in building high-load, fault-tolerant microservices. I specialize in Event-Driven Architecture, DDD, and CQRS, with a proven track record of optimizing database performance and leading monolithic-to-microservices migrations.
Other Software Development Services I Offer
FAQ
What do I need to send before you start?
A short description of the issue or feature, your .NET version, and access to the code (repo or the relevant files). API docs and DB schema help if integrations are involved.
Do you take very small tasks?
Yes. One bug, one endpoint or one small integration is exactly what the Basic package is for. Message me a short description and I’ll confirm scope and price.
Do you build websites or frontend?
Yes. I take frontend too: websites, landing pages, dashboards and admin panels (Razor, Blazor, React, Angular, jQuery), standalone or on top of your API. Send me what you need and I'll confirm scope and price.
Will I get the source code?
Yes, full source code is included in every package, plus a short summary of what changed.
What if I need changes after delivery?
Revisions are included in every package. Small follow-up tweaks are free. Larger new work is a new order.
Do you do API integrations (payments, webhooks, JWT/OAuth)?
Yes: payment providers, webhooks, third-party REST APIs, JWT/OAuth authentication. Send me the provider name or docs and I’ll confirm it’s doable.
Can you speed up a slow API or database queries?
Yes. I find the bottleneck (slow queries, N+1, caching, memory) and fix it. For a deeper review, add the “API performance audit” extra.
