Nitin Yadav

About Nitin Yadav

Experienced Backend Developer with a strong focus on building scalable, secure, and…

Experience

1. Back End Developer

   Paytring

   Dec 2024 — Present · Gurugram, IN

   Designed and developed the NPCI switch microservice integrating 40+ APIs for native UPI transactions, including collect/pay flows, e-mandates, transaction validation, VPA management, mobile registration, and authentication; used Kafka for async webhook and callback processing-Architected and implemented the Axis integration microservice enabling bank-grade payouts and eNACH mandate registration for subscription billing via custom checkout; used Kafka for async processing of tasks like SMS, emails, and background jobs-Integrated key Shopify APIs to support custom checkout, syncing orders, customer data, and payment events for both one-time and subscription flows-Architected and developed the MCP server to expose Paytring SDK APIs, integrated with the Gemini CLI to streamline development and onboarding-Built an API tester service for continuous verification of critical Paytring APIs during CI/CD, ensuring staging/production stability and fast issue resolution-Developed a custom observability library integrating Jaeger (OpenTelemetry) and zerolog for unified tracing and structured logging with minimal setup-Implemented Gatekeeper, a lightweight HTTP middleware library for access control, rate limiting, and IP whitelisting used across all Paytring services-Integrated Google, Apple, and Facebook authentication providers to enhance onboarding flexibility-Actively migrating legacy PHP service (40+ PGs) to modular Golang-based architecture with phased rollout, using Redis for caching and background task coordination.