API Development Services

Think of a waiter in a restaurant. You (the client) don't walk into the kitchen — you read the menu, give your order to the waiter, and the waiter brings back the food. An API is the waiter: it presents a menu of endpoints, accepts your request, talks to the kitchen (the database or backend), and returns a structured response — usually JSON. Access is controlled by authentication — an API key, an OAuth token, or a signed JWT — so only authorised callers can place an order.

GET /api/v1/orders/12345 HTTP/1.1
Host: api.example.co.uk
Authorization: Bearer eyJhbGciOi...
Accept: application/json

{
  "id": "12345",
  "customer": "ACME Ltd",
  "total_gbp": 248.50,
  "status": "shipped",
  "tracking": "RM123456789GB"
}

Most UK businesses already pay for several SaaS platforms that don't talk to each other. A custom API closes that gap — cutting admin hours, eliminating rekeying errors and unlocking data you already own.

1. 01

   Discovery

   Map your systems, data flows and business goals. Identify the integrations that pay back fastest.

2. 02

   Design

   Define endpoints, resource models, authentication method, rate limits and versioning strategy — written down before any code.

3. 03

   Build

   Type-safe implementation in Node.js / TypeScript (TanStack Start, Hono or Express), or your preferred stack. Clean code, end-to-end tested.

4. 04

   Test

   Unit, integration and contract tests. OWASP API Security Top 10 review. Load testing for high-volume endpoints.

5. 05

   Document

   Live OpenAPI (Swagger) docs generated from the code, plus Postman collections and a branded developer portal for partner APIs.

6. 06

   Deploy

   AWS London, Azure UK South, Cloudflare Workers or on-premise — with CI/CD pipelines, environment promotion and zero-downtime releases.

7. 07

   Monitor & support

   Structured logging, error tracking, uptime alerting, version deprecation and SLA-backed support if needed.

Every API we ship follows the OWASP API Security Top 10. We assume the endpoint will be attacked from day one — and design accordingly.

• UK-based team in Bournemouth — same time zone, plain English, no offshore hand-offs.
• Every API ships with live OpenAPI documentation — your in-house team can pick it up tomorrow.
• Built to scale — designed for traffic spikes, not just the demo day.
• Ongoing maintenance, versioning and SLA support available on retainer.
• Hands-on experience with Shopify, WooCommerce, Xero, Sage, Stripe, HMRC, Salesforce, Trustpilot and more.
• Fixed-fee quotes in writing, with no scope creep surprises.

Six questions to answer before the first line of code. Bring the answers to your discovery call and we can scope a fixed-fee quote on the spot.

1. 1What systems need to talk to each other, and which is the source of truth?
2. 2Is the data real-time, near-real-time, or batched (e.g., overnight)?
3. 3Who will consume the API — internal apps, partners, public developers, or AI agents?
4. 4What security level is required (public, authenticated, GDPR-sensitive, regulated)?
5. 5What's the expected traffic — requests per second at peak, and growth over 12 months?
6. 6Do you need public documentation, SDKs or a developer portal for external users?

Verdict: a custom API is the right choice for unique workflows, high transaction volumes, or anywhere data sensitivity, GDPR or UK residency rules out a US-hosted middleware tool.