At Billfree Labs Private Limited, I'm migrating PHP Yii2 backend modules to NestJS and TypeScript while preserving merchant API contracts, authentication, validation, and legacy business rules. I compare legacy and migrated behavior and use unit and integration tests to catch mismatches.
I also build merchant and public integration APIs for billing, customer, and business workflows. My work includes live WhatsApp chat features such as conversation search, credit balance management, and permission-based access.
At Bluelupin Technologies, I developed backend services for Niwish, a digital gold and silver investment platform. I integrated Cashfree and Razorpay payment workflows, including signed webhooks, idempotent callbacks, refunds, and failed-payment recovery.
I also implemented recurring SIP workflows and APIs for wallets, KYC, payouts, and physical redemption. I use Claude Code workflows with code review and test-based validation, and supported deployments and scheduled workers on AWS.
