Server-side systems and APIs in C# and ASP.NET Core — the part users never see but the whole product depends on. Clean REST APIs, real authentication, background jobs, integrations and a database designed to stay fast as the data grows. Built for correctness under real load, not just a demo. Remote, worldwide.
A backend is judged on the day it's under load, not the day it's demoed. Here's the kind of server-side work I build, with the reliability baked in.
Clean, versioned Web APIs on ASP.NET Core — the same foundation running under my live multi-GDS travel platform, front to back.
JWT and OAuth, role- and claim-based access, refresh tokens and multi-tenant isolation — security designed in, not bolted on later.
Queues, retries and scheduled work with Hangfire — for emails, refunds, syncs and anything that must survive a failed attempt.
Payment gateways, supplier and GDS feeds, and REST / SOAP / gRPC services made to talk to each other reliably. See GDS integration →
SQL Server schemas, EF Core and Dapper, tuned queries and clean migrations — the layer everything else sits on. See database work →
Structured logging with Serilog, health checks and audit trails — so when something goes wrong at 2am, the answer is in the logs.
The parts that make a backend trustworthy are the ones you can't see in a demo. Every build ships with them from the start.
The person designing your API also designs the database under it and the frontend that consumes it — so nothing gets lost in handoffs between specialists.
What the system must do, who calls it, and how it fails safely. We agree what's in — and what isn't — so the quote is honest.
The API contract, the data model and the auth model — agreed before code, because this is where rework hides.
Endpoints, jobs and integrations built in clean layers, with previews as we go so you're never surprised.
Validation, edge cases, retries and load — the failure paths tested, not just the happy path.
Ship it, wire up logging and monitoring, and stay on to add features as you grow. See support options →
Write-ups and related services that show how I approach backend work — the architecture, the integrations, and the data layer underneath.
Auth, the search-price-book flow, and the server-side plumbing — markup, wallets and multi-tenancy — a real API integration end to end.
The SQL Server layer your API sits on — schema design, indexing and query tuning so the backend stays fast under real traffic.
Already have a .NET backend that's fragile or stalled? I take over, stabilise and modernise existing systems too.
Tell me what the system needs to do and what it has to talk to — a rough idea is enough. You'll get an honest scope and a clear quote, with no pressure.