API development and integration
Most business software problems are integration problems. The data exists — it is in four systems, in four shapes, and nobody trusts any of them.
What this involves
We build APIs that are pleasant to consume: predictable naming, real error messages, pagination that works, versioning that does not break clients, and documentation generated from the code so it cannot drift out of date.
On the integration side, the difficulty is never the happy path. It is rate limits, partial failures, duplicate webhooks, records that exist on one side and not the other, and the silent schema change a vendor shipped on a Friday.
- REST and GraphQL APIs with generated documentation
- Authentication, scoped keys and rate limiting
- Webhook delivery with retries and idempotency
- Two-way sync with conflict resolution rules
- Third-party integrations: CRM, billing, storage, comms
- Monitoring and alerting on the integrations that matter
Designed for the failure cases
Every integration we build assumes the other side will be slow, will go down, and will occasionally send the same event twice. Idempotency keys, dead letter queues and replay tooling are standard, not extras — they are what stops a two-minute vendor outage becoming a day of manual data repair.
Making AI features consumable
When AI capability sits behind an API, it needs streaming support, request tracing, cost attribution per caller and sensible limits. We build these interfaces so your other teams can use the capability without needing to understand the model behind it.
Documentation as a deliverable
An API without current documentation is an API only its author can use. Specs are generated from the code, with examples that actually run.
Frequently asked questions
REST or GraphQL?
REST for most things — simpler to cache, debug and secure. GraphQL when you have many clients with genuinely different data needs. Choosing GraphQL for a single front end usually adds complexity without a return.
Can you integrate with a system that has no API?
Often yes, via database access, scheduled exports, or as a last resort browser automation. Each has trade-offs in reliability and we will be straight with you about them.
Do you handle migrations from an old API?
Yes, usually by running both in parallel behind a versioned interface, moving clients across gradually, then retiring the old one once traffic reaches zero.
How do you secure the API?
Scoped authentication, rate limiting per key, input validation at the boundary, least-privilege database access, and logging that captures enough to investigate without storing secrets.
Tell us what you are building.
Send a short description of the problem and we will reply within one business day with an honest view of scope, cost and whether we are the right person for it.
Or email directly: contact@hire-ai-dev.com