Skip to main content
Software Delivery

API Development & Integration

REST and GraphQL APIs, system integrations, and reliable data sync that connect your tools into one operational flow — designed, built, and documented properly.

  • REST API Design
  • GraphQL
  • Third-Party Integrations
Plan Your Integration Back to Development
API Development & Integration service
Key Features

What this service covers

Use development when this is the bottleneck slowing the work down.

REST API Design

Clean, versioned REST APIs following OpenAPI 3.1 standards with consistent error handling, pagination, and filtering patterns.

GraphQL

Flexible, type-safe GraphQL APIs that let clients request exactly the data they need. Subscriptions for real-time updates included.

Third-Party Integrations

Connect Stripe, QuickBooks, HubSpot, Twilio, and the other tools you already run — with reliable error handling and retry logic.

Webhook Systems

Event-driven webhook delivery with signature verification, retry queues, and delivery logs for reliable system-to-system communication.

API Documentation

Interactive API docs with Swagger UI or Redoc, SDKs, code samples, and Postman collections that make integration effortless.

Rate Limiting & Security

API key management, OAuth 2.0, rate limiting, request validation, and audit logging to protect your endpoints.

APIs are the backbone of modern software. Whether you’re exposing functionality to partners, connecting internal systems, or powering a mobile app, well-designed APIs determine how effectively your software ecosystem operates.

API Design & Development

REST APIs

We build RESTful APIs that follow industry best practices:

  • Resource-oriented URL design with consistent naming conventions
  • Proper HTTP method usage (GET, POST, PUT, PATCH, DELETE)
  • Standardized error responses with meaningful error codes
  • Cursor-based and offset pagination for large datasets
  • Filtering, sorting, and field selection for flexible querying
  • HATEOAS links for discoverability

GraphQL APIs

For applications requiring flexible data fetching:

  • Schema-first design with strong type definitions
  • Query complexity analysis to prevent abuse
  • DataLoader patterns for efficient N+1 query resolution
  • Real-time subscriptions over WebSocket
  • Persisted queries for production performance

Integration Services

We connect the tools you already run. The most common integrations fall into a few patterns:

  • Payments & billing — Stripe, PayPal, Square, and subscription/invoicing APIs
  • CRM & accounting — HubSpot, Salesforce, and QuickBooks, synced for consistent order, invoice, and customer data
  • Communication — Twilio for SMS and voice, Slack/Microsoft Teams bots, transactional email (SendGrid, Postmark)
  • Data synchronization — Real-time or batch sync between systems with conflict resolution and audit trails so failed syncs surface instead of silently dropping; Zapier or Make when a custom build is more than the job needs

If a tool you rely on isn’t listed here, ask — most integrations are variations on the same handful of patterns.

Cloud & Infrastructure

Cloudflare Workers is our primary platform for edge compute and hosting. We integrate with AWS, Google Cloud, or Azure services directly when that’s where your existing systems already live.

API Security

Security is built into every API we develop:

  • OAuth 2.0 / OIDC — Industry-standard authorization flows
  • API key management — Scoped keys with rotation policies
  • Input validation — Schema-based request validation with Zod or Joi
  • Rate limiting — Sliding window algorithms with per-key and per-IP limits
  • Audit logging — Detailed request logging for compliance and debugging
  • CORS policies — Properly configured cross-origin resource sharing

Why Choose R5 Industries

  • Developer experience — We build APIs that external developers can integrate in minutes, not days
  • Battle-tested patterns — Retry logic, circuit breakers, and idempotency keys for production reliability
  • Full documentation — Auto-generated OpenAPI specs, interactive docs, and client SDKs
  • Monitoring included — Request tracing, latency dashboards, and error alerting from day one

Need systems that connect cleanly? Book a planning session and we will scope the API work.

Need help with api development & integration?

Start with one conversation. If the work also touches another hub, we will coordinate it from the same plan.

Plan Your Integration Explore more Development services