Custom API Development
Robust REST and GraphQL APIs, third-party integrations, webhooks and data pipelines engineered for scale, security and uptime.
Introduction
WebStudioKKR builds custom REST and GraphQL APIs that your product is actually built on. Versioned, documented, secure and scalable — engineered for real production load, not weekend-project quality.
Detailed overview
An API is a product, not a feature. If your mobile app, partner integration or internal dashboard depends on an API, that API needs versioning, authentication, rate limiting, observability and clean documentation from day one. We build APIs the way SaaS companies build them — to be consumed at scale by people you may never meet.
Every API we ship starts with an OpenAPI or GraphQL schema agreed before code. JWT or OAuth 2.0 authentication, scoped permissions, rate limiting and idempotency keys are baked in, not added later. Webhooks come signed with HMAC, retried on failure and observable in a dashboard.
We integrate with payment gateways (Razorpay, Stripe, UPI), shipping providers (Shiprocket, Delhivery, Bluedart), CRMs (HubSpot, Zoho, Salesforce), ERPs (Tally, Zoho Books), and any third-party API you need. Output: production-ready APIs with OpenAPI spec, Postman collection, interactive docs, SDK starter code and a deployment pipeline.
Why choose this service
REST and GraphQL with full versioning strategy from v1
JWT, OAuth 2.0 and API key authentication implemented correctly
Rate limiting, idempotency and webhook signing built in
OpenAPI spec, Postman collection and developer docs included
Observability with structured logs, metrics and alerting
Full source code ownership and infrastructure handover
Our process
- 01
Discovery
Use cases, consumers, scale targets and SLA expectations defined.
- 02
Design
OpenAPI spec, resource model and auth flow reviewed before a line of code.
- 03
Build
Endpoints, input validation, auth, rate limiting and automated tests.
- 04
Integrate
Third-party APIs, queues, payments and webhooks wired up cleanly.
- 05
Document
Interactive docs, Postman collection and SDK starter code.
- 06
Deploy
CI/CD pipeline, monitoring, alerting and on-call runbook handover.
Key features
REST & GraphQL
Idiomatic REST or schema-first GraphQL — picked based on your consumers.
Webhooks & queues
Signed webhooks with retries, durable job queues for async work.
Auth & rate limiting
JWT, OAuth 2.0, scopes, rate limits and abuse protection out of the box.
Third-party integrations
Payment gateways, shipping, CRM, ERP — production-grade adapters.
Observability
Structured logs, metrics, distributed traces and uptime alerting.
Documentation
OpenAPI / GraphQL schema, Postman collection and starter SDKs.
Benefits
- Battle-tested production architecture
- Clear documentation your devs will actually read and use
- Built-in monitoring, alerting and on-call runbooks
- Predictable performance under load
- Full source code and IP ownership
- Versioned from v1 — no breaking changes for existing consumers
Industries we serve
Technologies we use
Frequently asked questions
Need a custom API built right?
Share your use case on WhatsApp or Telegram — we'll send a technical scope, architecture sketch and quote within one working day.