API Development & Integration Services USA
We design and build REST, GraphQL, and gRPC APIs plus integrate your systems with Stripe, Salesforce, HubSpot, Twilio, and 50+ other platforms — reliably, securely, and at scale.
Our API Development Services
RESTful API Development
Standards-compliant REST APIs with OpenAPI/Swagger documentation, versioning, pagination, filtering, and authentication.
GraphQL API Development
Flexible GraphQL schemas with subscriptions, DataLoader batching, and field-level authorization for frontend-friendly APIs.
gRPC & Protocol Buffers
High-performance gRPC services for microservices communication, streaming, and bi-directional data flows.
Third-Party Integrations
Proven integrations with Stripe, Salesforce, HubSpot, Twilio, SendGrid, QuickBooks, Xero, Shopify, and 50+ other platforms.
API Gateway & Security
API gateway setup (AWS API Gateway, Kong, Apigee) with rate limiting, authentication, caching, and request routing.
Webhooks & Event Streaming
Webhook delivery systems, event-driven integrations with Kafka/SQS, and reliable message processing with retry logic.
Technologies We Use
Our API Development Process
API Design
RESTful resource modeling, GraphQL schema design, gRPC service definition, and OpenAPI specification before coding.
Development & Testing
API implementation with comprehensive unit and integration tests, contract testing, and Postman collection creation.
Documentation
Auto-generated Swagger UI, developer guides, SDK examples, and Postman collections for easy consumption.
Security Hardening
OAuth 2.0/JWT auth, input validation, rate limiting, CORS configuration, and OWASP API Security Top 10 review.
Deployment & Monitoring
API gateway deployment, performance monitoring, error tracking, latency alerts, and usage analytics.
API Use Cases We Handle
Public API Products
Developer-facing APIs with documentation portals, API keys, usage tiers, and billing metering.
Mobile Backend APIs
Optimized APIs for iOS and Android apps with offline-first patterns and efficient data payloads.
ERP/CRM Integrations
Bi-directional data sync between Salesforce, HubSpot, SAP, and your custom systems.
Payment Integrations
Stripe, Braintree, PayPal, and ACH integration with webhooks, subscription management, and reconciliation.
Communication Integrations
Twilio SMS/voice, SendGrid email, Slack/Teams notifications, and push notifications.
Data Pipeline APIs
High-throughput ingestion APIs for IoT, analytics, and event streaming with Kafka or Kinesis.
Frequently Asked Questions
REST vs GraphQL — which should I use?
REST is simpler, more cacheable, and widely understood — ideal for public APIs and simple CRUD operations. GraphQL is better for complex frontends with varying data requirements, mobile apps that need to minimize data transfer, and APIs serving multiple frontend clients with different needs. We help you choose based on your specific use case.
How do you document APIs?
We generate OpenAPI (Swagger) specifications from code annotations, create interactive Swagger UI documentation, write developer guides with request/response examples, create Postman collections, and can build dedicated developer portals with authentication, usage metrics, and API key management.
Can you integrate with Salesforce or HubSpot?
Yes. We have deep experience with Salesforce REST API, Bulk API, Metadata API, and Apex triggers. For HubSpot, we build custom integrations using their CRM API, Marketing API, and webhooks. We also handle bi-directional sync with conflict resolution, field mapping, and error recovery.
How do you ensure API security?
We implement OAuth 2.0 with JWT tokens, API key management, rate limiting (per-key and per-IP), input validation and sanitization, TLS enforcement, CORS configuration, WAF rules, and regular penetration testing. All APIs follow the OWASP API Security Top 10 guidelines.
Build Your APIs Today
Free API architecture consultation. REST, GraphQL, or gRPC — we pick the right approach for your use case.