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.NET Backend API Development

We build backend APIs on .NET 8 designed for performance, scalability, and long-term maintainability. .NET Minimal API, Clean Architecture, PostgreSQL, and MongoDB form our proven foundation for serious business applications.

Our backends serve Flutter mobile apps, React web platforms, and third-party integrations. We design API contracts in coordination with frontend teams to prevent breaking changes and data format mismatches.

What We Build

REST and GraphQL APIs

Well-structured REST APIs and GraphQL endpoints for mobile and web clients. Versioning, Swagger/OpenAPI documentation, rate limiting, and response caching.

Multi-Tenant SaaS Backends

Tenant isolation, RBAC, subscription management, and usage metering. Architecture that keeps customer data strictly separated as you scale.

Real-Time Data Processing

SignalR WebSockets for live updates, event streams, and push notifications. RabbitMQ queues and Hangfire jobs for async processing without blocking request threads.

Integration APIs

Connectors between third-party services — payment gateways, CRMs, ERPs, and data providers. Resilient error handling, retry policies, and circuit breakers.

Microservices and Modular Monoliths

We build both. For most startups a modular monolith is faster to ship and simpler to maintain. We move to microservices when real scaling requirements justify the operational cost.

Our Stack

  • .NET 8
  • C#
  • Minimal API
  • Entity Framework Core
  • PostgreSQL
  • MongoDB
  • Redis
  • RabbitMQ
  • Hangfire
  • SignalR
  • JWT / OAuth2
  • Azure / AWS
  • Docker
  • GitHub Actions

Why Codevia

  • Ukrainian .NET Specialists

    Our backend engineers in Ukraine have deep .NET and C# expertise. You get senior-level architectural decisions at realistic rates, without inflated agency overhead.

  • Full Stack Under One Roof

    Backend, Flutter mobile, and React frontend — all coordinated by us. No handoff friction between separate agencies, no API contract mismatches, faster overall delivery.

  • Long-Term Maintainability

    Clean Architecture and proper layering is not a marketing claim — it is how we build. You will not be left with technical debt that takes months to untangle.

Frequently Asked Questions

.NET Minimal API (introduced in .NET 6) reduces ceremony, delivers measurably lower startup latency, and forces a clean separation between routing and business logic. For new projects it is our default. We still use MVC controllers when integrating with existing codebases that rely on them.
We use PostgreSQL for relational data that requires ACID guarantees, transactions, and complex joins. MongoDB is our choice for document-oriented data, audit logs, and scenarios requiring flexible schema evolution. We often use both in the same project for different data domains.
JWT with short-lived access tokens and refresh token rotation is our standard. For multi-tenant systems we implement claim-based RBAC with policy handlers. We also integrate with external identity providers (Azure AD, Auth0, Keycloak) when required.
Yes. We use Hangfire for persistent background jobs and scheduled tasks. For high-throughput message processing we use RabbitMQ or Azure Service Bus. Event sourcing patterns are available for domains requiring full audit history.
Yes. We do architecture reviews, identify problem areas, and incrementally improve the codebase. We do not require a full rewrite to start delivering value — we make targeted improvements while keeping the system running.

Need a reliable .NET backend for your product?

Tell us about your architecture or project scale and we will provide a technical assessment within one business day.

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