Skip to content
OakVertics

Engineering

API Development

APIs designed as products in their own right: predictable contracts, honest errors, real documentation and versioning that does not break the integrations already depending on you.
p95 latency target on core endpoints
<120msp95 latency target on core endpoints
Breaking changes without a migration path
ZeroBreaking changes without a migration path
Typical partner time-to-first-call
1 dayTypical partner time-to-first-call

Capabilities

What this actually involves

The specific work, not a list of technologies.

API design

REST, GraphQL or gRPC selected on the consumption pattern, with contracts specified in OpenAPI or schema before implementation begins.

Third-party integration

Payments, logistics, identity, messaging and industry platforms integrated with retry, idempotency and reconciliation so failures do not corrupt state.

Developer experience

Generated documentation, sandbox environments, client SDKs and useful error messages — the difference between an API adopted and an API abandoned.

Reliability

Rate limiting, circuit breaking, webhook delivery with retries, and per-consumer observability so you can see who is affected when something degrades.

Deliverables

What you receive

Everything below transfers to you on completion — code, infrastructure and documentation included.
  • OpenAPI or GraphQL schema as the source of truth
  • Production API with authentication and rate limiting
  • Interactive documentation portal and sandbox
  • Client SDKs for your consumers' languages
  • Webhook infrastructure with delivery guarantees
  • Contract tests and load test results

Typical stack

Node.jsTypeScriptGraphQLgRPCOpenAPIKongRedisPostgreSQL

Ideal for

  • Platforms opening up to partners or customers
  • Businesses monetising data or capability access
  • Teams untangling point-to-point integrations

Common questions

What clients ask first

If your question isn't here, ask it directly — you'll get a straight answer.

REST or GraphQL?

REST for stable, cacheable, machine-to-machine contracts; GraphQL when varied clients need different shapes of the same data. Many platforms justify both, and we will say which fits your consumers.

How do you version without breaking consumers?

Additive changes by default, explicit versioning for breaking ones, deprecation windows with usage telemetry showing exactly who still needs to migrate.

Can you document an existing API?

Yes. We reverse-engineer the contract from the implementation and traffic, produce an accurate specification, then close the gaps between documented and actual behaviour.

Related

Often delivered alongside

Custom Software Development

Systems built for your operating model, not a template's.

Cloud Engineering

Infrastructure that scales predictably and costs what you expect.

Enterprise Software

Systems that satisfy procurement, security and the people using them.

Start the conversation

Need api development?
Let's talk specifics.

Six questions gets you a recommended package, an indicative timeline and a technology plan. No sales call needed to get a useful answer.

  • Reply within 4 business hours
  • No cost, no obligation
  • NDA on request before you share anything

Two ways to begin

Scope your projectInteractive · about 60 secondsBook a consultation30 minutes with an engineer
newbusiness@oakvertics.com