Full Stack Developer

Subham Kumar

I build web, mobile, and AI-powered products with React, Next.js, React Native, Node.js, and LLMs.

About

I turn product requirements into usable interfaces.

I am a full-stack developer with 3+ years of experience building production web, mobile, and backend systems across enterprise ERP, government platforms, real-time apps, ed-tech serving 20M+ users, and AI tools.

I work across the stack: React and React Native interfaces, Node.js and Express APIs, real-time systems with Socket.IO and Redis, and AWS deployments. Lately I have been building LLM, RAG, and AI agent workflows.

React, Next.js and React Native apps

Node.js APIs and real-time systems

AWS, Docker and CI/CD

LLM, RAG and AI agent workflows

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Experience

Products I have helped ship

A practical timeline of production work across enterprise ERP, government mobile apps, education platforms, dashboards, and SEO-sensitive React apps.

Software Development Engineer - I

Codebucket Solutions (P) Ltd

May 2025 - PresentIndia

React.jsTypeScriptReact NativeNode.jsExpress.jsSocket.IORedisAWS SQSMySQLCasbin

ChessVeda

Chess platform covering clubs, tournaments, gameplay, puzzles, leaderboards, endgames, and streaming.

Delivered in 2 months, with REST APIs and Socket.IO, Redis, SQS, workers, clusters, and cron jobs for real-time and async processing.

Enterprise ERP System

Auto-distribution ERP with 200+ modules, built with React and TypeScript.

Complex workflows: financial forms, document locking, sleep mode, security checks, reusable components, and standardized currency input.

COMFED (Sudha) Gov App

Government React Native app used by 50K+ users.

Led development: RBAC, farmer management, DCS operations, milk procurement, and field-level workflows.

Yitran Survey System

Government survey backend handling 10K+ daily API requests.

Built with Node.js, Express.js, MySQL, OTP authentication, Casbin RBAC, and REST APIs.

Software Developer

Walsis eConnect India (P) Limited

Mar 2024 - May 2025Bengaluru, India

Next.jsReact.jsReduxTailwind CSSSSRSEO

Sarthaks.com

Student dashboard serving 20M+ users.

Improved UI performance, admin workflows, and schema-based data handling. Raised daily engagement 30% and resolved 150+ critical issues.

Quizard

Interactive quiz platform.

Improved SSR and SEO for 2x organic traffic, and added multiplayer quizzes that raised participation 50%.

Admin Dashboard

Comprehensive admin panel for project management and database operations.

Gave administrators structured tools for project setup, database management, and visualization.

BloomTuition

Live teaching platform for interactive online education.

Improved platform stability and user experience for live teaching workflows.

Selected work

Selected projects

Mobile apps, workflow tools, browser utilities, and real-time web apps. Each project focuses on a practical user problem.

All projects

LORQ AI onboarding chat and knowledge gap report

LORQ AI - KT Platform

AI knowledge-transfer platform for onboarding: managers create questions, evaluate answers and find knowledge gaps, and new hires chat with company data through RAG.

Turns onboarding into a measurable loop: questions, evaluated answers, gap reports, and a RAG chat over company knowledge.

LLMsRAGAI AgentsOpenAI APIClaude API

Demo

Sita Dairy - Dairy Management System

React Native dairy management app used by 200+ active users for milk collection, customers, billing, payments, and reports.

Digitizes daily dairy transactions, from collection and customer tracking to billing, payments, and reporting.

React NativeExpoBillingReports

Code Demo

Pravartak freight quote card and onboarding steps

Pravartak Logistics Portal

Logistics quote and onboarding portal: quote management, WhatsApp/email sharing, automatic account creation, KYC, document verification, and admin support flows.

Takes a customer from first quote to a verified account in one flow, with support tools for the admin team.

ReactNode.jsREST APIs

Demo

BlurMe blurring sensitive fields in a browser window

BlurMe - Privacy for Screen Sharing

Chrome extension that blurs sensitive information before you share your screen, record, or join Zoom and Meet calls: area, element, and full-screen blur, tab masking, and WhatsApp and ChatGPT privacy modes.

Rated 5.0 on the Chrome Web Store. Blurs persist across reloads and all processing stays in the browser.

JavaScriptChrome ExtensionPrivacy

Demo

QR Coin reward and redemption app preview

QR Coin - Reward & Redemption App

Mobile reward platform with secure QR code generation and coin-based redemption.

Designed around secure scanning, redemption flow clarity, and operator-friendly mobile screens.

React NativeExpoExpress.jsJWTRBAC

Code Demo

Bahix: Billing & Inventory

Billing and inventory app on Google Play: multi-user invoicing, customers, stock, GST billing, and analytics.

Brings invoice creation, stock updates, and GST-ready views into one app for small businesses.

React NativeExpress.jsPostgresAnalytics

Code Demo

Capabilities

A modern JavaScript stack, shaped around product delivery.

The goal is not a long badge wall. It is a focused stack that helps me build clear, maintainable interfaces across web and mobile.

Frontend

Product interfaces, state, and data fetching.

React.jsNext.jsTypeScriptJavaScriptRedux ToolkitReact QueryTailwind CSS

Mobile

Production React Native apps with role-based, form-heavy workflows.

React NativeExpoReact Hook FormRole-based flows

Backend

APIs, databases, access control, and real-time services.

Node.jsExpress.jsREST APIsMySQLMongoDBPostgreSQLCasbinSocket.IORedis

Cloud & DevOps

Deploying, running, and monitoring services on AWS.

AWS (Lambda, EC2, S3)DockerNginxPM2GitHub ActionsCloudFrontSonarQubeDozzleGit

AI / GenAI

LLM features, retrieval, and agent workflows.

LLMsRAGAI AgentsPrompt EngineeringOpenAI APIClaude API

Delivery strengths

Scalable APIsReal-time systemsComponent architecturePerformance & SEORole-based access controlAI & RAG workflows

Notes

What I am learning, written down properly

Long-form notes on JavaScript, React, Node and system design. Plain English, real diagrams, and the mistakes that actually cause bugs in production.

Roadmap

The full stack interview roadmap

725 topics and questions across 13 tracks, 456 of them core, phased over six weeks.

See the full list

JavaScript28 Aug 2026

JavaScript language fundamentals, in plain English

The 14 fundamentals every JavaScript interview starts with, explained in plain English with diagrams, gotchas and the answer to say out loud.

Read the note

JavaScript1 Sept 2026

Scope, closures and this

The ten topics that open more interview rounds than anything else in JavaScript, including the loop and setTimeout puzzle and writing your own bind.

Read the note

All notes

Writing

Notes and guides

Short, practical writing on React Native setup, deployment, resumes, and developer workflows.

View all

Mar 22, 2023

Career

Resume for Freshers: Important Points to Keep in Mind

Practical resume guidance for freshers preparing for software development roles.

Read

Oct 30, 2025

React Native

Complete Guide: Setting up React Native CLI for Android on macOS

A step-by-step Android setup guide for React Native CLI development on macOS.

Read

Nov 21, 2025

Deployment

How to Update a React Native App Without Play Store

A lightweight update workflow for distributing Android app updates with JSON metadata.

Read

Credentials

Certifications

A compact view of the credentials that support my React, cloud, and engineering fundamentals.

AWS Cloud Practitioner

2025

Amazon Web Services

Cloud basics, deployment concepts, shared responsibility, and platform best practices.

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React Certification

2023

NamasteDev (Akshay Saini)

Scalable React applications using React, Redux, component patterns, and modern tooling.

View

Blockchain Certification

2023

NPTEL

Blockchain fundamentals, distributed ledgers, and smart contract development concepts.

View

Contact

Have a product, role, or collaboration in mind?

Send a message with a little context. I am happy to discuss frontend, mobile, portfolio, dashboard, and full-stack product work.

Direct channels

Prefer email for project details. LinkedIn and GitHub are best for quick profile checks and code references.

Emailshubhamkr354@gmail.com LinkedInlinkedin.com/in/subham-kr GitHubgithub.com/DigitalSubham