API development UK
Armdia Systems provides API development UK from the United Kingdom. Typical engagements run from GBP 12,000 to GBP 80,000 and last three weeks to four months. Work is delivered by named senior engineers with written scope, documented handover and security review built into the delivery process.
REST through OpenAPI 3.1, GraphQL through Apollo or Yoga, webhooks for event delivery and gRPC where strict typing and performance matter.
API keys, OAuth 2.1, OpenID Connect, mutual TLS and token bucket rate limiting through Cloudflare are selected by threat model and consumer needs.
Every interface ships with generated documentation, examples, authentication notes, error models, quick starts and test coverage for contract behaviour.
Salesforce to internal databases, Shopify to ERP, government services to legacy middleware and data warehouse synchronisation are common integration patterns.
Use this table to choose the right starting point before a discovery call.
| Model | Typical use | Commercial shape |
|---|---|---|
| Audit | Assess an existing product, risk or architecture | Fixed price written report |
| Build phase | Design and ship a scoped product or feature set | Fixed price after discovery |
| Retainer | Keep a product healthy after launch | Monthly reserved capacity |
| Option | Best fit | Risk to check |
|---|---|---|
| Armdia Systems | Bespoke systems with clear ownership and United Kingdom first delivery. | Requires a proper discovery phase before fixed pricing. |
| Off the shelf SaaS | Standard workflows with little custom process risk. | Licence, integration and process mismatch costs can grow. |
| Freelance contractor | Small isolated tasks with limited governance needs. | Continuity, documentation and support coverage need scrutiny. |
REST with OpenAPI is preferred for simple resource based interfaces with broad consumer compatibility. GraphQL is preferred when clients need flexible queries, typed schemas and reduced over fetching across multiple data sources.
Documentation is generated from the specification. Interactive playgrounds, authentication guides, error reference, quick start examples per language and contract test suites are delivered alongside the interface.
URL path versioning or header versioning is selected based on consumer needs. Breaking changes are communicated with migration guides and a deprecation timeline agreed before removal.
Yes. Middleware layers, data transformation, protocol bridging and scheduled synchronisation are common patterns for connecting modern interfaces to legacy platforms.
Authentication through API keys, OAuth 2.1 or mutual TLS is selected by threat model. Rate limiting, input validation, logging and abuse detection are configured before production use.
Contract tests validate request and response shapes. Integration tests confirm end to end behaviour. Load tests confirm capacity. All tests run automatically on every deployment.