API Development & Integration
API development and integration connects your software to the other systems it depends on. We design REST and GraphQL APIs and integrate third-party services such as Stripe, CRMs and internal tools, with authentication, webhooks and error handling built to survive real production traffic.
Integrations are easy to demo and hard to make reliable. The request that succeeds in testing is not the problem; the problem is the timeout at 3am, the duplicate webhook, the silently changed field, and the retry that charges a customer twice.
We build integrations defensively — idempotency keys, signature verification, exponential backoff, dead-letter queues and logging you can actually search — so that when a third party misbehaves, your system degrades quietly instead of losing data.
What's Included
Included in every API Integration engagement.
REST or GraphQL API design
Well-structured, versioned and documented APIs with consistent error handling and sensible pagination.
Third-party integrations
Payment providers, CRMs, shipping, accounting and marketing platforms connected to your product reliably.
Reliable webhooks
Signature verification, idempotent handling and replay protection so duplicate events cannot corrupt your data.
Authentication & security
OAuth, API keys and JWT handled correctly, with rate limiting and secrets kept out of your codebase.
Data synchronisation
Two-way sync between systems with conflict resolution, so records do not silently diverge over time.
Monitoring & alerting
Health checks, failure alerts and searchable logs, so a broken integration is noticed immediately.
How It Works
- 1
Map the systems
We document what needs to talk to what, which system owns each field, and how often data must move.
- 2
Design contracts
Schemas, authentication and error semantics agreed up front, so both sides know exactly what to expect.
- 3
Build & harden
Implementation with retries, idempotency and rate limiting, tested against the failure cases rather than only the happy path.
- 4
Deploy & monitor
Production rollout with alerting and dashboards so integration health is visible rather than assumed.
Technologies We Use
- Node.js
- REST
- GraphQL
- Stripe
- OAuth 2.0
- PostgreSQL
- Redis
- Docker
Frequently Asked Questions
Can you integrate a system with poor or missing documentation?
Usually yes. Where documentation is incomplete we work from observed behaviour, inspecting real traffic and testing against a sandbox to establish how the API actually responds. Legacy SOAP and undocumented internal services are common cases.
How do you handle failed API calls and downtime?
With retries using exponential backoff, idempotency keys so a repeat request cannot double-charge or duplicate a record, queues that hold work while a provider is down, and alerts when failures exceed a threshold. The aim is that a third-party outage delays your data rather than losing it.
Do you build the API or only connect to existing ones?
Both. We design and build APIs for your own product, and integrate external services into it. Frequently a project involves both — exposing a clean internal API while consuming several third-party ones behind it.
Can you fix an integration that keeps breaking?
Yes. That starts with an audit of the failure pattern, since recurring breakage usually traces back to missing idempotency, unverified webhooks or absent retry logic. You get a written diagnosis and a fix plan before work begins.
Ready to start your project?
Tell us what you're building and you'll get a clear scope, timeline and fixed quote — at no cost.