REST API Design
Clean, versioned REST APIs following OpenAPI 3.1 standards with consistent error handling, pagination, and filtering patterns.
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
Key Features
What this service covers
Use development when this is the bottleneck slowing the work down.
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 web and mobile app, well-designed APIs determine how reliably and securely your software ecosystem operates.
API Protocols & Architecture
We engineer APIs with strict contracts, high test coverage, and clear boundaries between internal domain logic and external clients:
OpenAPI 3.1
RESTful APIs
Resource-oriented architectures engineered for predictability, universal client compatibility, and efficient HTTP edge caching.
- Resource-oriented URL design with consistent plural naming
- Strict HTTP method semantics (GET, POST, PUT, PATCH, DELETE)
- Standardized RFC error responses with actionable error codes
- Cursor-based and offset pagination for massive datasets
- OpenAPI 3.1 specifications and interactive Swagger / Redoc portals
Type-Safe & Reactive
GraphQL APIs
Schema-first APIs that let web and mobile clients query precisely the fields they need with zero round-trip waste or over-fetching.
- Schema-first design with strict TypeScript & GraphQL type definitions
- DataLoader batching to eliminate N+1 database queries
- Real-time WebSocket subscriptions for reactive live updates
- Query complexity analysis and depth limiting to prevent abuse
- Persisted queries for edge CDN caching and query whitelist security
Integration Services
We connect the business tools you already run into a unified operational flow, eliminating double-entry and fragmented records:
Financial Systems
Payments & Billing
Stripe • PayPal • Square • Invoicing APIs
Webhook-driven payment collection, automated subscription lifecycle management, and reliable multi-party payment reconciliation.
- Idempotent webhook ingestion with cryptographic signature validation
- Automated proration, recurring billing, and dunning workflows
- Multi-currency support and automated payout disbursement
Operations & ERP
CRM & Accounting
HubSpot • Salesforce • QuickBooks • Xero
Bi-directional synchronization for customer accounts, sales opportunities, inventory records, and financial ledgers.
- Bi-directional sync of contacts, accounts, and deal pipelines
- Invoice generation and journal entry synchronization
- Automated deduplication and conflict resolution rules
Messaging
Communication & Alerts
Twilio • SendGrid • Postmark • Slack • Teams
High-deliverability transactional messaging, automated SMS alerts, and internal operations chat bots that keep teams informed.
- DKIM/SPF-signed transactional email with delivery tracking
- Automated two-way SMS reminders and status notifications
- Interactive Slack & Microsoft Teams bots for internal approvals
Real-Time Sync
Data Pipelines & Webhooks
Cloudflare Queues • Event Streams • Zapier / Make
Event-driven pipelines with dead-letter retry queues, audit trails, and data reconciliation so dropped syncs are impossible.
- Event-driven webhook dispatch with signature verification
- Exponential backoff retries and dead-letter queues
- Full audit logs with payload inspection and replay capabilities
Cloud & Edge Infrastructure
Cloudflare Workers is our primary runtime for ultra-low latency edge compute, globally distributed key-value storage, and serverless queues. We integrate natively with AWS, Google Cloud, and Azure environments when your existing services reside there.
API Security & Governance
Security is engineered into every endpoint from day one. We enforce zero-trust principles across authentication, rate limiting, and request validation:
OAuth 2.0 & OIDC
Industry-standard authorization flows, PKCE for mobile/SPA clients, short-lived tokens, and cryptographic JWT signature validation.
Scoped API Keys
Granular permission scoping, automated rotation policies, secret hashing at rest, and strict redaction in logging pipelines.
Runtime Schema Validation
Type-safe runtime request and response validation powered by Zod, rejecting malformed or unexpected payloads before execution.
Rate Limiting & Throttling
Sliding-window algorithms with per-token and per-IP quotas to prevent DDoS attacks, scraping, and downstream service saturation.
Structured Audit Logging
Tamper-evident, sanitized request logging with correlation IDs for compliance requirements, audit readiness, and incident debugging.
CORS & Network Policies
Hardened cross-origin resource sharing headers, strict TLS 1.3 enforcement, and origin whitelist verification on all public gateways.
Why Choose R5 Industries
Developer Experience
We build APIs that internal and external developers can integrate in minutes with turnkey SDKs, clear schemas, and copy-paste examples.
Production Reliability
Battle-tested retry logic, circuit breakers, idempotency keys, and dead-letter queues engineered for 99.99% uptime.
Living Documentation
Auto-generated OpenAPI 3.1 specs, interactive Swagger/Redoc explorers, and Postman collections kept in sync with code.
Day-One Observability
Distributed request tracing, latency percentiles, and automated alerting so you catch anomalies before your users do.
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.