Thu, 
20:40

Hi! My name is Gaurav Kumar

I build scalable backend systems that power products used by millions.

Backend Developer with 5+ years of experience in building scalable SaaS products using Node.js, Express.js, React.js, and Next.js. Proficient in API development, microservices architecture, GraphQL, AWS, and cloud deployment. Led a team of 5 engineers, reduced system latency by 40%, and handled 1L+ notifications monthly. Strong focus on delivering robust solutions in agile environments.

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Skills

Backend

Node.jsExpress.jsNest.jsGraphQLREST API

Frontend

React.jsNext.jsTypeScriptJavaScriptTailwind CSS

Database

PostgreSQLMongoDB

Cloud & DevOps

AWSDockerCI/CD

Tools & Other

RabbitMQSalesforceGit

Experience

API Lead

Twimbit

Apr 2020 - Present
  • ▹Led development of scalable notification service using RabbitMQ, reducing system latency by 40% and processing 1L+ notifications monthly
  • ▹Architected multi-tenant SaaS platform with microservices (Node.js, Docker, AWS EC2, S3, RDS) for automated cloud deployment
  • ▹Designed and implemented in-house CMS with Next.js + GraphQL APIs supporting editor-based workflows for 1K+ users per tenant
  • ▹Integrated Salesforce CRM to sync leads/contacts across tenants with GraphQL endpoints for chatbot integration
  • ▹Built GraphQL data integration system optimizing API performance and response times
  • ▹Mentored 5 junior developers on API design, microservices, and cloud deployment best practices
Node.jsGraphQLNext.jsRabbitMQDockerAWSSalesforceSaaSReact

Software Intern

Twimbit

Jan 2020 - Apr 2020
  • ▹Developed full-stack features in React, resolving bugs and refactoring legacy components
  • ▹Built Invitation service using Node.js and Express.js for admin user management
  • ▹Implemented UI design improvements enhancing user experience and consistency
ReactNode.jsExpress.jsNext.js

Software Development Engineer

Bridged Media

Nov 2019 - Dec 2019
  • ▹Migrated legacy REST API to GraphQL (Nest.js), improving data fetching performance by 35%
  • ▹Implemented JWT authentication with PostgreSQL and MongoDB for diverse data models
  • ▹Built popular posts filter using view events, increasing content discovery and engagement
Nest.jsGraphQLPostgreSQLMongoDBJWTREST API

GraphQL API Developer

Vieuth™ - View of Youth

Oct 2019 - Nov 2019
  • ▹Built full-stack MERN application for student academic journey management with task and opportunity tracking
  • ▹Architected GraphQL API connecting multiple services for enhanced functionality
  • ▹Implemented payment system with coins for task completion and redemption
  • ▹Created reporting service for mentor performance reports and shareable student report cards
MERNGraphQLNode.jsExpress.jsMongoDBReact

Back End Developer

Hajaam

Aug 2019 - Sep 2019
  • ▹Developed backend for salon appointment booking platform with automated calendar invites
  • ▹Built rating/review system enabling top salon filtering based on popularity
  • ▹Created REST APIs with TDD achieving 99.9% test coverage, reducing production bugs
  • ▹Automated AWS deployments with CI/CD, improving release speed by 30%
Node.jsExpress.jsAWSCI/CDTDDREST API

Full Stack Engineer

Young Engine™

Apr 2019 - Jul 2019
  • ▹Built full-stack application connecting students with companies for short-term tasks
  • ▹Implemented features: task creation/verification, submission, reward allocation, authentication, profile management
  • ▹Developed wallet system for rewards upon task completion using MERN stack
MERNNode.jsExpress.jsMongoDBReact

Projects

AI-Powered Shopping Assistant

A conversational shopping assistant that lets users browse products, add to cart, and checkout using natural language AI search.

DemoCode
Next.jsVercel AI SDKTailwindGraphQL
▹Conversational AI interface for product search
▹Cart management & checkout flow
▹Gemini-powered natural language queries

Crypto Wallet with MetaMask

A Web3 wallet application enabling users to connect MetaMask, view balances, and send transactions on Ethereum testnet.

DemoCode
Next.jsEthereumWeb3MetaMask
▹MetaMask wallet integration
▹Transaction history dashboard
▹Sepolia testnet support

Real-time Notification Service

Scalable microservices-based notification system handling millions of messages with RabbitMQ and AWS. Supports multi-channel delivery (email, push, SMS) with queuing and retry mechanisms.

Node.jsRabbitMQAWS (EC2, S3, RDS)Docker
▹Multi-channel notifications: email, push notifications, SMS
▹Message queuing with RabbitMQ for reliable delivery
▹Reduced system latency by 40% through optimization
▹Microservices architecture deployed on AWS with auto-scaling
▹Handles 1 lakh+ (100K+) notifications monthly with 99.9% uptime

Enterprise CMS Platform

Multi-tenant SaaS CMS with GraphQL APIs supporting editor-based publishing workflows. Integrates with Salesforce CRM for lead management and serves ~1,000 users per tenant.

Next.jsGraphQLNode.jsSalesforceAWS
▹Multi-tenant architecture with isolated data per tenant
▹GraphQL API with optimized resolvers for fast queries
▹Salesforce CRM integration for lead & contact sync
▹Editor-based publishing workflows for reports
▹Production-ready with ~1K active users per tenant

Blog

How I Created an MCP Server for PostgreSQL to Power AI Agents

Building a Model Context Protocol server for PostgreSQL to enable AI agents to interact with databases directly.

2025•8 min read

Reliable Background Task Execution Using BullMQ and NodeJS

A deep dive into implementing robust background job processing with BullMQ for scalable Node.js applications.

2025•6 min read

Understanding GraphQL Federation in Microservices Architecture

Learn how to implement GraphQL Federation to unify multiple microservices under a single GraphQL gateway.

2024•10 min read
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