REST API Design
Clean, versioned REST APIs following OpenAPI 3.1 standards with consistent error handling, pagination, and filtering patterns.
API Development & Integration
Key Features
What We Offer
Comprehensive software development services designed to bring your ideas to life with clean code and modern architecture.
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 to Stripe, Salesforce, HubSpot, Twilio, and hundreds of other services 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
- Federation for microservice architectures
Integration Services
Payment & Commerce
- Stripe Connect for marketplace payments
- PayPal, Square, and Adyen integration
- Subscription billing and invoicing APIs
- Tax calculation with Avalara or TaxJar
CRM & Marketing
- Salesforce, HubSpot, and Pipedrive sync
- Mailchimp, SendGrid, and Postmark for transactional email
- Segment for customer data platform routing
- Custom webhook handlers for marketing automation
Communication
- Twilio for SMS, voice, and video
- Slack and Microsoft Teams bot integration
- Intercom and Zendesk for customer support
- Push notification services (FCM, APNs)
Cloud & Infrastructure
- AWS services (S3, SQS, Lambda, DynamoDB)
- Google Cloud (BigQuery, Pub/Sub, Cloud Functions)
- Azure (Blob Storage, Service Bus, Functions)
- Cloudflare Workers for edge compute
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 — Comprehensive 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
- Comprehensive documentation — Auto-generated OpenAPI specs, interactive docs, and client SDKs
- Monitoring included — Request tracing, latency dashboards, and error alerting from day one
Connect your systems and unlock new capabilities. Contact us to discuss your API project.
Pricing
Service Pricing
Transparent, competitive rates with no hidden fees—choose the plan that fits your needs
Pricing table for api-integration
API Development
$ 125
Per Service
REST or GraphQL API design, development, documentation, and testing. Billed hourly.
System Integration
$ 5,000
One Time
Connect existing systems via APIs with data mapping, transformation, and sync.
API Maintenance
$ 400
Monthly
Monitoring, versioning, documentation updates, and performance optimization.
FAQ
Frequently Asked Questions
Get answers to common questions about this service.
What types of API integrations do you support?
Integration types
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We work with REST, GraphQL, gRPC, SOAP, and webhook-based APIs across virtually every industry vertical. Whether you need to connect payment gateways, CRMs, ERPs, or third-party data services, we build reliable, well-documented integrations.
Can you build custom APIs for our platform?
Custom APIs
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Yes, we design and develop custom RESTful and GraphQL APIs with comprehensive documentation, versioning, and authentication. Our APIs are built for performance and include rate limiting, caching, and monitoring out of the box.
How do you ensure API reliability and uptime?
Reliability
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We implement retry logic, circuit breakers, and health checks to handle transient failures gracefully. Comprehensive logging and alerting through tools like Sentry and Datadog mean issues are detected and resolved before they impact your users.
Do you help with legacy system integration?
Legacy systems
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We frequently bridge modern applications with legacy systems through middleware, API wrappers, and data transformation layers. This approach lets you modernize incrementally without risky big-bang migrations or disruptions to existing workflows.
How do you handle API security and authentication?
API security
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Every integration includes proper authentication via OAuth 2.0, API keys, or JWT tokens depending on the use case. We also implement input validation, rate limiting, and encryption to protect data in transit and prevent unauthorized access.