API & Backend Development

API Development and Backend Development Services

Well-designed REST APIs and backend services that web apps, mobile apps, partners and AI features can depend on — documented, secured, tested and observable.

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ASP.NET Core Web API
Minimal APIs
Node.js
REST
OpenAPI
Webhooks
Stripe
SQL Server

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What we build

REST APIs
Resource-oriented APIs with versioning, pagination, validation and consistent error responses.
Mobile & web backends
APIs designed for Flutter, React and Next.js clients, including authentication and file handling.
Third-party integrations
Stripe, CRMs, ERPs, email and SMS providers and other REST APIs.
Webhooks & events
Reliable inbound and outbound webhooks, queues and background processing.
Public & partner APIs
API keys, OAuth, rate limiting and documentation for external developers.
AI-enabled APIs
Backend endpoints that wrap LLM calls with permissions, logging and cost control.

API quality checklist

OpenAPI specification for every endpoint
Authentication and authorization on every route
Input validation and consistent error format
Idempotency for payments and other critical operations
Automated integration tests against a real database
Structured logging, tracing and health checks
Rate limiting and sensible timeouts

Frameworks

ASP.NET Core Web API
Minimal APIs
Node.js
TypeScript

Data

Entity Framework Core
Dapper
SQL Server
PostgreSQL
MongoDB

Integration

REST
Webhooks
Stripe
Third-party APIs
OAuth 2.0

Runtime

Docker
Azure
AWS
CI/CD

From the blog

Guides on API & Backend Development

Computer screen displaying source code in a code editor

.NET4 min read

ASP.NET Core Web API Best Practices for Production Systems

A checklist of the practices we apply to every ASP.NET Core API we build — from error handling and security to performance and observability.

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Smartphone with a home screen of app icons on a wooden table

Mobile4 min read

Flutter App Development Cost: What Really Drives the Price

Why two 'simple' apps can differ in cost by a factor of five — and how to scope, estimate and control the budget for a Flutter app.

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3D rendered letters AI on a dark digital background

AI4 min read

How to Integrate the OpenAI API in ASP.NET Core Applications

A practical architecture and code walkthrough for adding LLM features to an ASP.NET Core application — securely and at predictable cost.

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Frequently asked questions

Which technologies do you use for APIs?

Primarily ASP.NET Core (Web API and Minimal APIs) in C#, and Node.js with TypeScript where it suits the project or your existing stack.

Can you integrate with third-party APIs?

Yes. We integrate payment providers such as Stripe, CRMs, ERPs, messaging services, mapping and other REST APIs, with retry, idempotency and error handling.

How do you document APIs?

Every API we build is described with OpenAPI, so clients can generate SDKs and your team can explore endpoints interactively.

Can you improve an existing slow or unreliable API?

Yes. We profile the API, fix database and query issues, add caching and background processing where appropriate, and add monitoring so problems are visible early.