API Development
APIs that power your ecosystem.
Zarsco builds scalable, secure, and well-documented APIs that connect your products, partners, and internal systems. From RESTful services to GraphQL and WebSocket APIs, our backend engineers build APIs designed for reliability and developer experience.
Developer-First Design
Clear, consistent APIs with comprehensive OpenAPI documentation and SDKs.
Enterprise Security
OAuth 2.0, API keys, rate limiting, and IP allowlisting for secure access.
High Performance
APIs handling thousands of requests per second with sub-100ms response times.
Versioning & Stability
Semantic versioning and backward-compatible changes for API consumers.
What we do for you
Third-Party Integrations
APIs connecting your platform with Salesforce, HubSpot, Shopify, and hundreds more.
Mobile App Backend
RESTful or GraphQL APIs powering iOS and Android applications.
Microservices Architecture
Internal APIs enabling microservices to communicate reliably at scale.
Partner API Program
Public APIs for third-party developers to build on your platform.
Data APIs
APIs for real-time and batch data access with streaming support.
Webhook System
Event-driven APIs that push real-time updates to external systems.
Everything included in our API Development service
We handle every aspect from strategy to launch so you can focus on outcomes, not execution.
- RESTful API design with OpenAPI 3.0 spec
- GraphQL API with query optimization
- WebSocket for real-time features
- OAuth 2.0 and API key authentication
- Rate limiting and throttling
- API versioning strategy
- Comprehensive Postman/Swagger documentation
- SDK generation for JavaScript, Python, and more
Frequently Asked Questions
REST vs GraphQL — which should I choose?
REST is simpler, better-cached, and widely understood — great for most use cases. GraphQL excels when clients need flexible queries or when you're supporting many different client types. We'll recommend the right choice for your specific architecture.
How do you handle API security?
We implement OAuth 2.0 or API key auth, HTTPS only, input validation, SQL injection prevention, rate limiting, CORS policies, and audit logging for all API requests.
Do you write API documentation?
Yes. We provide OpenAPI 3.0 (Swagger) specifications, Postman collections, integration guides, and code examples. Good documentation is non-negotiable for any API we build.
Can you build APIs that integrate with third-party services?
Yes. We have experience integrating with hundreds of third-party APIs — Stripe, Twilio, SendGrid, Salesforce, HubSpot, AWS services, Google APIs, and many more.
Ready to get started with API Development?
Book a free consultation call. Our experts will assess your needs and outline a clear plan.