The API Guys
API Specialists

API Development for UK Businesses

Expert API development and integration services. We design, build, and maintain APIs that power your business. Based in Leeds, serving companies across the United Kingdom.

API Development Services

From custom API development to complex integrations, we deliver solutions that connect your systems and power your applications.

RESTful API Development

Well-designed REST APIs following industry standards. Clean endpoints, proper HTTP methods, and comprehensive documentation.

GraphQL APIs

Flexible GraphQL APIs that let clients request exactly the data they need. Efficient queries and real-time subscriptions.

API Integration

Connect your systems with payment gateways, CRMs, ERPs, and third-party platforms. We handle the complexity of integrations.

Built for Production

Our APIs are built with security, performance, and maintainability in mind. Every API we deliver is production-ready.

Authentication & Security

OAuth 2.0, JWT tokens, API keys, and rate limiting. We build APIs that are secure by design.

High Performance

Optimised for speed with caching, efficient queries, and scalable architecture that handles high traffic.

Comprehensive Documentation

OpenAPI/Swagger documentation, Postman collections, and developer guides that make integration easy.

Versioning & Compatibility

API versioning strategies that let you evolve your API without breaking existing integrations.

Error Handling

Consistent error responses, meaningful status codes, and detailed error messages for easier debugging.

Monitoring & Logging

Built-in logging, performance monitoring, and alerting so you know how your API is performing.

Clean API Design

We follow REST best practices and design APIs that are intuitive for developers to use. Consistent patterns, clear naming, and predictable behaviour.

  • RESTful design principles
  • Consistent JSON response formats
  • Proper HTTP status codes
  • Pagination, filtering, and sorting
GET /api/v1/orders
{
  "success": true,
  "data": [
    {
      "id": "ord_abc123",
      "status": "completed",
      "total": 99.99,
      "currency": "GBP",
      "created_at": "2026-02-03T10:30:00Z"
    }
  ],
  "meta": {
    "current_page": 1,
    "total_pages": 10,
    "total_count": 97
  }
}

Integration Experience

We've integrated with hundreds of third-party APIs. Whatever platform you need to connect to, we can help.

Stripe
PayPal
Xero
QuickBooks
Salesforce
HubSpot
Mailchimp
Twilio
AWS Services
Google APIs
Microsoft 365
Slack

Ready to Build Your API?

Whether you need a new API, help with integrations, or want to improve an existing API, our Leeds-based team is ready to help.