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SB DigitalAgency
Web Development

API Development & Integration

REST and GraphQL APIs plus third-party integrations that hold up under real traffic.

API Development & Integration

The API layer is where most digital products quietly break. Poorly designed endpoints, missing pagination, no rate limiting, and integrations held together with hard-coded keys create problems that surface at exactly the wrong time.

We design APIs as products: versioned, documented, authenticated, rate-limited and monitored, with sensible error contracts. Whether it is a public API for your customers or an internal service connecting your CRM, payments and analytics, the standard is the same.

We also handle third-party integration work — Stripe, HubSpot, Salesforce, Xero, Google APIs, WhatsApp Business, delivery partners — including webhook handling, retry logic and reconciliation.

120ms
P95 latency
99.8%
Webhook success
-87%
Integration failures

99.8%

Webhook delivery success after retries

The problems we fix

  • Integrations that silently fail

    Without retry logic, idempotency and alerting, a failed webhook means a lost order that nobody notices.

  • No documentation

    Undocumented endpoints make every new integration a reverse-engineering project for your team.

  • Unbounded endpoints

    Missing pagination, rate limits and query limits turn a traffic spike into an outage.

How we fix them

  • Reliable integration patterns

    Idempotency keys, exponential-backoff retries, dead-letter queues and alerting on failures.

  • Docs and versioning

    OpenAPI specification, interactive documentation and a versioning policy that protects your clients.

  • Protection by default

    Authentication, scoped tokens, rate limiting, input validation and query complexity limits.

Deliverables

What API Development & Integration includes

What you actually get

  • API design specification and data contracts
  • REST or GraphQL implementation with authentication
  • OpenAPI documentation and interactive reference
  • Webhook publishers with retry, idempotency and signing
  • Third-party integrations (payments, CRM, messaging, analytics)
  • Rate limiting, caching and query-complexity protection
  • Monitoring, structured logging and error alerting
  • Integration tests and load testing report

Tools & platforms

  • Node.js
  • Fastify
  • GraphQL
  • OpenAPI
  • Postman
  • Redis
Process

How we deliver it

  1. 01

    Design

    Define resources, contracts, auth model and versioning strategy.

    Week 1

  2. 02

    Prototype

    Core endpoints and a mock server so consumers can start work early.

    Week 2

  3. 03

    Implement

    Full implementation with validation, auth, rate limits and tests.

    Week 2–5

  4. 04

    Integrate

    Connect third-party services with webhooks, retries and reconciliation.

    Week 5–7

  5. 05

    Harden

    Load testing, monitoring, documentation and runbooks.

    Week 7–8

FAQ

API Development & Integration — common questions

Discuss your api development & integration project

Book a free 30-minute consultation and get a written plan — whether or not you work with us.