Hi, I'm Nayan Kunwar

Backend Engineer · Node.js · Distributed Systems

Backend Engineer with 2+ years of experience building scalable backend systems using Node.js, TypeScript, PostgreSQL, MongoDB, Redis, Kafka, and Docker. Experienced in REST APIs, event-driven architecture, payment gateway integrations, distributed systems, vector databases, Retrieval-Augmented Generation (RAG), and LLM API integration. Hands-on experience building Agentic AI systems using LangChain and LangGraph, including tool calling, workflow orchestration, and AI-powered backend capabilities.

Core expertise:

• System Design & Backend Architecture
• Node.js, TypeScript & PostgreSQL
• Event-Driven Systems (Kafka, BullMQ, Redis)
• Payment Gateway Integrations (Stripe, Razorpay)
• Microservices & Distributed Systems
• AI-Powered Backends (RAG, Vector DBs, LLM API Integration)
• Agentic AI with LangChain & LangGraph (Tool Calling, Orchestration)

Featured Project

• Swyft

  Featured

  Automotive marketplace backend connecting customers, stores, and delivery partners with event-driven order processing and complex payment flows.

  • Multi-sided marketplace with real-time order tracking via Socket.io
  • Event-driven architecture using Apache Kafka and background workers
  • Stripe Connect integration for onboarding, transfers, and payouts
  • Redis caching and BullMQ for asynchronous job processing
  • Node.js
  • TypeScript
  • PostgreSQL
  • Prisma
  • Redis
  • BullMQ
  • Apache Kafka
  • Stripe Connect
  • Socket.io
  • AWS

Tech I Work With

• Node.js
• TypeScript
• PostgreSQL
• MongoDB
• Redis
• Apache Kafka
• BullMQ
• Prisma
• Docker
• AWS
• Stripe
• Razorpay
• Socket.io
• Nginx
• LangChain
• LangGraph
• Vector Databases
• RAG (Retrieval-Augmented Generation)
• LLM API Integration