AVAILABLE FOR FULL STACK & BACKEND ROLES

BUILDING RESILIENT BACKENDS & DISTRIBUTED SYSTEMS, BIT BY BIT.

Hi, I'm Sumit Kumar. I engineer scalable, decoupled backends and web applications utilizing Event-Driven Microservices, Domain-Driven Design (DDD), CQRS, Transactional Outbox Pattern, RabbitMQ, NestJS, Next.js, and Agentic AI workflows.

📄 Download CV (.PDF)

NestJS Next.js RabbitMQ Docker PostgreSQL Redis TypeScript LangChain AI

sumit@dev ~ interactive shell

● online

Sumit.dev Cloud Shell [Version 1.5.0]
Type help or click chips below to inspect skills, projects, and architecture.

sumit@dev:~$

Years Exp

Full-stack & Backend Engineering

50+

Repositories

Architected systems & AI POCs

220+

DSA Solved

Competitive logic in C++ & Python

99.9%

Zero Message Loss

Transactional Outbox + DLQ Mesh

Core Skills & Technologies

Categorized layout of technologies, programming languages, and core software architecture designs I specialize in.

Architectural Paradigms

Domain-Driven Design (DDD)

CQRS Architecture

Event-Driven (EDA)

Event Sourcing

Inbox-Outbox Pattern

Microservices

Saga Pattern

Broker & Job Queues

Pub/Sub & Real-Time

Languages & Backend

C++ (STL)

Python

JavaScript

TypeScript

Django

DSA & OOP

Java

NestJS

Node.js / Express

Databases & Infrastructure

SQL

MongoDB

MySQL

PostgreSQL

Redis

BullMQ

Socket.io

RabbitMQ

TypeORM

Mongoose

Docker

Linux (CLI)

Git & GitHub

AI, Agents & Specialized Tech

LangChain / LangGraph

Google Gemini API

Deepgram Voice STT

FFmpeg Processing

Frontend & Tools

HTML5 & CSS3

React

Next.js

Tailwind CSS

MUI

Redux & RTK

Zustand

Postman

HeroUI

Ant Design

React Hook Form

Zod

Payment Gateways

Stripe

Razorpay

Paymongo

Cloud & Hosting

Vercel

Render

Railway

Netlify

InfinityFree

Aiven

Production Implementations

Featured Projects & Repositories

Engineered systems demonstrating transactional outbox patterns, payment pipelines, agentic AI, and low-level custom C++ architectures.

🌿 branch: main

#a1c9e4

LangChain AI Agent POC [AI/ML]

An intelligent agentic POC exploring AI agent workflows using LangGraph and LangChain JS/TS, leveraging Google Gemini LLM API, memory layers, and custom tool binding architectures.

LangChain LangGraph Gemini API TypeScript Node.js

🌿 branch: main

#8f4b21

Eternal Frames [Outbox DDD]

A multi-tenant event photography gallery & studio management platform. Features subscription tier billing via Razorpay, modular NestJS DDD architecture, transactional Outbox pattern messaging with RabbitMQ, and a Next.js App Router frontend.

NestJS PostgreSQL RabbitMQ Razorpay Next.js Redux

🌿 branch: main

#5e3d7a

Deca Chat [WebSockets]

A real-time multi-room messaging system built on NestJS Domain-Driven Design (DDD). Features WebSockets/Socket.io communication, member management, transactional Inbox-Outbox message synchronization via RabbitMQ, and weekly chat analytics.

NestJS Socket.io PostgreSQL RabbitMQ Next.js

🌿 branch: main

#9b20e1

C++ Custom Web Crawler [Raw C++]

Built a web crawler in raw C++ using custom generic string, linked list, and hashmap libraries — completely avoiding external dependencies or standard string methods with strict manual memory management.

C++ Sockets Data Structures Memory Mgmt Linux

🌿 branch: main

#4a8f9c

Custom C++ Library Suite [Systems]

Designed and engineered generic C++ data structure and utility libraries from scratch, including custom implementation of HashMap, LinkedList, and String classes with manual heap audits and optimized search bounds.

C++ Templates Algorithms Memory Audit

🌿 branch: main

#2d11bc

RabbitMQ Exchanges POC [Microservices]

A message routing architecture implementing Direct, Topic, and Fanout exchanges in RabbitMQ for asynchronous multi-service event orchestration and distributed task distribution.

NestJS RabbitMQ PostgreSQL Docker Microservices

🌿 branch: main

#6c99ef

AI Problem Analyzer [BullMQ AI]

An intelligent engineering assistant using React, Express.js, and Google Gemini API to analyze system bug reports, utilizing Redis and BullMQ for task queues, and MongoDB for state tracking.

React Express.js Gemini API BullMQ Redis MongoDB

🌿 branch: main

#3f88dd

AI Resume Builder [Deepgram + Gemini]

An AI-powered profile synthesis platform built with Node.js and Express. Uses FFmpeg to extract audio and Deepgram API (Nova-3 STT) to transcribe speech, then leverages Google Gemini Flash to structure transcriptions into validated profile JSON.

Node.js Deepgram API Gemini API FFmpeg BullMQ Redis

Production History

Professional Experience

Production engineering deployments, distributed microservices, payment gateway integrations, and real-time backend infrastructure.

commit 7f8a9e2 🌿 branch: production

Feb 2026 – Present CURRENT PRODUCTION ROLE

Full Stack Developer

Zenmonk Software & Services • Mohali, India • Full-Time

🏛️ Domain Isolation

Enforced Domain-Driven Design (DDD) & CQRS with NestJS to cleanly isolate domain boundaries.

📬 Zero-Loss Outbox

Architected Transactional Outbox Pattern with RabbitMQ for atomic database writes & event pub/sub.

🐳 Microservices Mesh

Containerized isolated domain workloads via Docker into resilient, decoupled microservices.

▸

Modular Architecture: Engineered scalable backend systems using NestJS, Next.js, and TypeScript with strict DTO contract schemas.

▸

Guaranteed Event Delivery: Eliminated dual-write failure points across PostgreSQL and message brokers using Transactional Outbox and idempotent consumer deduplication.

▸

Agile & CI/CD Leadership: Collaborated with senior architects in Agile sprints, leading code reviews, Git pull request merges, and automated Postman API verification.

commit 4d11ca8 🌿 branch: release/payments

Nov 2025 – Feb 2026 COMPLETED INTERNSHIP

Junior Node.js Developer Intern

Techbuilder • Mohali, India • Internship

💳 Payment Gateways

Integrated PayMongo, GWallet (Philippines) & Stripe Connected Accounts for vendor payouts.

🛡️ Idempotent Webhooks

Engineered webhook listeners with duplicate prevention guards and retry fault tolerance.

⚡ Delivery Order Scale

Optimized high-concurrency order dispatch REST routes for ride & food delivery platform.

▸

High-Throughput Order APIs: Maintained and optimized Node.js & Express.js backend services supporting real-time delivery transactions.

▸

Automated Merchant Payouts: Designed end-to-end driver onboarding and scheduled payout pipelines using Stripe Connect.

▸

Version Control & PR Reviews: Managed Git feature branching, pull request reviews, and production release staging.

commit 1b09fc3 🌿 branch: release/mern-dsa

Feb 2025 – Nov 2025 COMPLETED INTERNSHIP

Software Developer Intern

CodeQuotient • Panchkula, India • Internship

🧩 Full-Stack MERN

Developed full-stack web applications utilizing MongoDB, Express, React, and Node.js.

🧠 120+ LeetCode DSA

Mastered complex data structures, trees, dynamic programming, and graphs in C++ & Python.

⚡ State & UI Tuning

Tested, debugged, and optimized React component rendering performance with team leads.

▸

Full-Stack Applications: Engineered responsive web apps with decoupled Express REST backends and MongoDB state tracking.

▸

Algorithmic Rigor: Solved 120+ competitive algorithmic puzzles under strict time/space complexity constraints.

Academic Background

Education

🎓 2025 – 2027 (CGPA: 8.0)

Master of Computer Applications (MCA)

Chandigarh University • Specialization in AI/ML

Specialization in AI/ML System Architecture

🏛️ 2021 – 2025 (CGPA: 7.5)

Bachelor of Computer Applications (BCA)

Arya P.G. College, Panipat (Kurukshetra University)

Computer Science Software Engineering

🏫 HIGHER SECONDARY

Class 12 & Class 10

Arya Sr. Sec. School, Panipat

Milestones & Values

Achievements & Leadership

🥇 1st Place – On-Spot Coding

Zerone24 IT Fest

Competed in real-time solving complex algorithmic puzzles under tight time pressure with maximum execution efficiency.

🥈 2nd Place – On-Spot Debugging

Zerone24 IT Fest

Diagnosed and patched runtime logic faults, syntax bugs, and concurrency defects in competitive code layouts.

🎖️ NCC & NSS Service

Discipline & Community Operations

Trained in disciplined teamwork and social welfare campaigns, building high-resilience execution habits.

Direct Channel

Get In Touch & Collaborate

Have an open full-stack or backend engineering opportunity, system architecture question, or AI project to build? Let's connect!

// DIRECT NETWORK COORDINATES

✉️

DIRECT EMAIL

iam.sumitkumar64@gmail.com

📞

MOBILE / WHATSAPP

+91 99925 28037

🔗

LINKEDIN PROFILE

linkedin.com/in/iamsumitkumar64

↗ Visit

🐙

GITHUB REPOSITORIES

github.com/iamsumitkumar64

↗ Visit

⚡

LEETCODE PROFILE

leetcode.com/u/iamsumitkumar64

↗ Visit