API Development & Third-Party Integrations
Part of Software Development ←
An API built to be integrated once and trusted for years — not one that breaks every downstream consumer on the next release.
Undocumented APIs are one of the most common silent liabilities in software. A team ships an endpoint, it works for the one client who asked for it, and six months later nobody remembers what a field means, whether it's still in use, or what breaks if it changes. Then a schema update meant to fix one thing quietly breaks three downstream integrators who had no warning and no changelog to check. The cost shows up as emergency support tickets, not as a line item anyone budgeted for.
We treat an API as a contract, not an internal implementation detail. That means documentation generated from the actual code (not written once and left to rot), explicit versioning so changes don't silently break existing consumers, and rate limiting and error handling designed for how real clients actually behave — including the ones that retry too aggressively or send malformed requests. The API should be boring to integrate against. That's the goal.
What's Included
Documented, versioned API
A REST or GraphQL API with OpenAPI/Swagger documentation kept in sync with the code, and a versioning strategy so breaking changes don't surprise existing integrators.
Third-party integrations, tested end to end
Working integrations with the payment gateways, CRMs, ERPs, or SaaS platforms your business relies on, including error handling for when the third-party service is slow, down, or returns unexpected data.
Authentication and rate limiting
API key or OAuth-based authentication, plus rate limiting and abuse protection, so the API stays stable under both normal and unexpected load.
Postman collection and integration guide
A ready-to-use request collection and a written integration guide so your team or your partners can start consuming the API without a support call.
Our Approach
Design the contract before writing the implementation.
We spec the endpoints, request/response shapes, and error formats first, so the API is designed around how it will be consumed, not whatever the backend happened to return first.
Version from the first release.
Breaking changes get a new version, not a silent update. Existing integrators keep working while new capabilities ship alongside them.
Test integrations against real failure modes.
We test third-party integrations against timeouts, malformed responses, and rate limits — not just the happy path — because that's when integrations actually break in production.
Frequently Asked Questions
Payment gateways (Razorpay, Stripe), CRMs (Salesforce, HubSpot), ERP systems, communication platforms (Twilio, SendGrid), and cloud storage and analytics services are the most common. If it exposes an API, we can typically integrate with it — the scoping conversation is about how much custom handling the integration needs.
We version explicitly, typically through the URL path or a header, and maintain backward compatibility for a defined deprecation window when we ship breaking changes. Existing integrators get advance notice and a migration guide, not a surprise failure.
A focused API covering a handful of core resources with documentation typically runs ₹4-8 lakh over 5-8 weeks. A larger API surface with multiple third-party integrations and complex business logic runs ₹12-25 lakh over 10-16 weeks. Standalone third-party integrations (connecting an existing system to one external service) typically run ₹1.5-4 lakh depending on the complexity of the service's own API.
Yes. We audit the current API surface, identify where the missing documentation, versioning, or error handling is causing the breakage, and fix it incrementally where possible rather than requiring a full rebuild. If a rebuild genuinely is the right call, we'll tell you why.
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