Available for Work

MERN Stack Developer

BUILDING BOLD PRODUCTS

KUNAL SINGH.

I build backend-heavy web products that stay fast, stable, and easy to evolve.

Across four years, I have shipped full-stack systems spanning commerce, CRM, logistics, and conversational automation.

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Node.jsExpress.jsTypeScriptReact.jsNext.jsMySQLMongoDBPostgreSQLAWS EC2AWS S3Socket.ioPayment GatewaysMQTT

Years Experience

Backend-heavy product delivery

Products Shipped

Case studies across multiple domains

9.33

GPA

B.Sc. IT, University of Mumbai

10+

Integrations Built

PayU, Razorpay, MQTT, Zoom, Facebook, WhatsApp, IVR...

About

Building products from idea to impact.

About Me

I am a MERN stack developer based in Thane, Mumbai, focused on shipping product experiences that balance frontend polish with strong backend architecture.

My work usually sits close to the business: payments, CRM automation, workflow systems, real-time communication, and operational tooling that teams rely on every day.

I enjoy owning the full delivery path from API and database design through UI implementation, deployment, and production hardening.

Featured Projects

Case studies built around backend depth, real integrations, operational workflows, and production surfaces that stay clear under pressure.

8 of 8 Projects

Personal#01

ClearBook – Shared Ledger for Buyers & Sellers

A real-time shared digital ledger that lets buyers and sellers track transactions, payments, outstanding balances, and credit history from a single source of truth — replacing spreadsheet and WhatsApp-based reconciliation with instant sync, smart payment reminders, and a referral-driven growth loop.

Next.jsNode.jsExpress.jsMongoDB

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Sublime TechnoCorp#02

Morix – Digital Signage Platform

A cloud-based digital signage SaaS with a multi-tier distribution model, split payment settlements, full media lifecycle management, and real-time device sync over MQTT — backed by a PostgreSQL database layer with triggers, functions, and stored procedures for business-critical operations.

Node.jsExpress.jsTypeScriptPostgreSQL

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Sublime TechnoCorp#03

MK Gare Jewelers – Jewellery E-Commerce Platform

A full-stack jewellery e-commerce platform with static page generation, real-time metal price-driven product pricing, a making charge discount engine, inventory-aware order management, and PayU checkout with coupon support.

Next.jsNode.jsExpress.jsPostgreSQL

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Sublime TechnoCorp#04

Auction-Based E-Commerce Platform

A backend-heavy commerce platform combining time-bound auction flows, Razorpay payments, and Zoom-powered live sessions — letting sellers present items in real time while buyers bid and transact in the same flow.

Node.jsExpress.jsRazorpayZoom SDK

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Sublime TechnoCorp#05

CRM System

A lead and campaign operations system ingesting 500+ daily leads from five channels — Facebook, WhatsApp, IVR, IndiaMart, and Justdial — into a unified pipeline with automated assignment and follow-up workflows.

Node.jsExpress.jsFacebook SDKWhatsApp API

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Sublime TechnoCorp#06

Freight Forwarding Management System

A full-stack management platform for a freight forwarding business covering quotation generation, job tracking across air, sea, and land shipments, multi-currency accounting, and document management in one operational system.

Next.jsNode.jsExpress.jsMySQL

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Personal#07

Automated Marketing Chatbot

A personal project — a visual workflow-driven chatbot builder for lead capture and automated engagement, combining a React Flow node editor, real-time Socket.io communication, and MongoDB-persisted flow execution.

Next.jsReact FlowSocket.ioMongoDB

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Personal#08

Video Transcoder

A personal project — a browser-based video transcoding tool that accepts up to three video uploads and returns a single ZIP file containing each video re-encoded at 360p, 720p, and 1080p resolutions, powered by a server-side FFmpeg pipeline exposed over a REST API.

Node.jsExpress.jsFFmpegMulter

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What I Do

Services Built for Scale

Backend-heavy product engineering for startups and businesses that need reliable systems, not just pretty interfaces. From architecture to deployment, I own the full delivery path.

4+ YearsProduction Experience

6+ ProductsShipped End-to-End

10+ IntegrationsPayment & Communication

100% RemoteGlobal Delivery

Custom Web Development

Modern, scalable websites and web applications designed to increase conversions and accelerate business growth.

Business Websites
Custom Web Applications
Admin Dashboards

React.jsNext.jsNode.js

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Mobile App Development

Cross-platform Android and iOS applications with beautiful UI and reliable backend integrations.

Android & iOS
React Native
API Integration

React NativeNode.jsMongoDB

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Custom ERP & Business Management Systems

Custom ERP software that automates operations, improves productivity, and centralizes your business data.

CRM
Inventory
Sales & Purchase

ReactNext.jsNode.js

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SaaS Product Development

Build and launch scalable SaaS platforms with secure authentication, subscriptions, and cloud infrastructure.

Subscription Billing
Authentication
Tenant Management

Next.jsNode.jsPostgreSQL

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API Development & Third-Party Integrations

Secure APIs and seamless integrations connecting your business with external platforms.

REST APIs
Payment Gateways
WhatsApp API

Node.jsExpress.jsJWT

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Dedicated Developer / Hourly Freelancing

Flexible development support for startups, agencies, and businesses on an hourly basis.

Feature Development
Bug Fixes
Consulting

ReactNext.jsNode.js

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Have a project in mind? Let's discuss how I can help.

View All Services

Skills & Technologies

Backend Engineering

Building resilient APIs, business logic, and integration-heavy systems that support real product operations.

Node.js

Express.js

REST APIs

Socket.io

Frontend Development

Crafting responsive interfaces with modern React patterns and product-focused interaction design.

React.js

Next.js

React Flow

TypeScript

Databases

Designing and working with data models that support speed, clarity, and operational reliability.

MySQL

MongoDB

PostgreSQL

Cloud & Deployment

Shipping production-ready applications with dependable infrastructure and hosting workflows.

AWS EC2

AWS S3

SSL & Hosting

Deployment Ops

Languages

Using the right language for product engineering, systems thinking, and implementation depth.

JavaScript

TypeScript

C++

Experience

May 2022 - Present

MERN Stack Developer

Sublime TechnoCorp

Architected and shipped 5+ full-stack products across e-commerce, CRM, digital signage SaaS, and logistics — owning backend design, API development, and frontend delivery end-to-end.
Designed production-grade REST APIs and database schemas across PostgreSQL, MySQL, and MongoDB, leveraging stored procedures, triggers, and database functions for business-critical workflows.
Integrated payment gateways (PayU, Razorpay) with split-payment logic, coupon validation, and real-time pricing engines driven by live market data.
Built multi-channel integrations across Facebook Business SDK, WhatsApp API, IVR, IndiaMART, JustDial, MQTT, and Zoom Video SDK for automation and real-time communication.
Managed end-to-end production infrastructure — Ubuntu VPS provisioning, SSL certification, AWS EC2/S3 deployment, and CI/CD pipelines via GitHub Actions.

Education

B.Sc. IT

University of Mumbai

2019 - 2022

Built a strong academic foundation in software development, data handling, and applied computing.

GPA 9.33/10

HSC

Gandhi Nagar Public School, CBSE

2018 - 2019

SSC

Gandhi Nagar Public School, CBSE

2016 - 2017

LET'S
TALK.

Open to product engineering roles and contract work — remote or on-site — where backend reliability and thoughtful frontend execution both matter.

iamkunalkumar2000@gmail.com +91 8057 532605

Thane, Mumbai

linkedin.com/in/kunal-singh-030b69233 github.com/iamkunalkumar2000

BUILDING BOLD PRODUCTS

KUNAL SINGH.

Years Experience

Products Shipped

GPA

Integrations Built

Building products from idea to impact.

Featured Projects

ClearBook – Shared Ledger for Buyers & Sellers

Morix – Digital Signage Platform

MK Gare Jewelers – Jewellery E-Commerce Platform

Auction-Based E-Commerce Platform

CRM System

Freight Forwarding Management System

Automated Marketing Chatbot

Video Transcoder

Services Built for Scale

Custom Web Development

Mobile App Development

Custom ERP & Business Management Systems

SaaS Product Development

API Development & Third-Party Integrations

Dedicated Developer / Hourly Freelancing

Skills & Technologies

Backend Engineering

Frontend Development

Databases

Cloud & Deployment

Languages

Experience

MERN Stack Developer

Education

B.Sc. IT

HSC

SSC

LET'STALK.

LET'S
TALK.