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Chapter 01 — Introduction

Rajan Kumar

Building scalable applications and intelligent digital experiences.

Computer Science & Engineering student at IIIT Sonepat, from full-stack platforms to RAG pipelines and agentic AI systems, building software that combines performance, usability and thoughtful engineering.

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Portrait of Rajan Kumar

Rajan Kumar

Full-Stack Developer & AI Engineer

B.Tech CSE, IIIT Sonepat

MERN Stack · Backend Engineering · Generative AI · RAG

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Chapter 02 — About

Engineering with curiosity

Rajan Kumar in a tuxedo, studio portrait

Education

IIIT Sonepat

B.Tech, Computer Science & Engineering · 2023–2027

CGPA 8.5/10 · 600+ DSA problems solved

I'm a Computer Science & Engineering student at the Indian Institute of Information Technology, Sonepat. I work across the full development lifecycle: responsive interfaces, backend APIs, databases, authentication and deployment.

My primary stack is React, Next.js, TypeScript, Node.js and Express.js. Alongside it, I'm deeply interested in Machine Learning, Generative AI, Retrieval-Augmented Generation and Agentic AI.

I also practice Data Structures and Algorithms, with 600+ problems solved across LeetCode and GeeksforGeeks. My goal is to become a software engineer who can design, build and scale reliable products.

Principles

  1. 01Solve complex problems with curiosity and experimentation.
  2. 02Keep learning, continuously.
  3. 03Build practical, scalable software.
  4. 04Value clean code and maintainable architecture.
  5. 05Strong fundamentals make reliable systems.

Chapter 03 — Education

Where the foundations were built

  1. 2023 – 2027

    Indian Institute of Information Technology, Sonepat

    B.Tech, Computer Science & Engineering

    CGPA 8.5/10 · Sonipat, Haryana

  2. 2019 – 2021

    Laxmi Narayan Dubey College, Motihari

    Class XII, BSEB

    81.80%

  3. 2018 – 2019

    Nand High School, Sugauli, East Champaran

    Class X, BSEB

    72.40%

Chapter 04 — Experience

Building in production environments

Jun 2026 – Aug 2026

VDG Industries Limited

Software Development Engineer Intern

React.js · TypeScript · Node.js · Express.js · MongoDB · PostgreSQL · Docker · CI/CD

  • Developed full-stack applications using React.js, TypeScript, Node.js and Express.js.
  • Integrated MongoDB, PostgreSQL, authentication systems, Docker and CI/CD workflows.
  • Improved backend reliability through modular architecture, API optimization and structured error handling.
  • Worked on application development, backend engineering and deployment workflows.

May 2026 – Jul 2026

Labmentix Pvt. Ltd.

Web Development Intern

MongoDB · Express.js · React · Node.js · REST APIs · JWT · Multer · Vercel · Git / GitHub

  • Developed MERN stack applications with REST APIs and JWT authentication.
  • Implemented file uploads using Multer, PDF processing and digital signature functionality.
  • Deployed applications using Vercel and integrated third-party services and asynchronous workflows.
  • Managed development workflows using Git and GitHub.

Chapter 05 — Technical expertise

The toolkit, by domain

Languages
JavaJavaScriptTypeScriptPythonCSQL
Frontend
React.jsNext.jsHTML5CSS3Tailwind CSSBootstrap
Backend
Node.jsExpress.jsREST APIsSocket.IOJWTSession & Cookie Auth
Databases
MongoDBPostgreSQLMySQLSQLiteRedis
AI / ML
Machine LearningNLPGenerative AIRAGAgentic AIAI AgentsScikit-learnLangChainLangGraphHugging FaceFAISS
DevOps & Cloud
DockerKubernetesCI/CDAWSGitHub ActionsTerraform
CS Fundamentals
DSAOOPOperating SystemsComputer NetworksDBMS
Tools
GitGitHubLinuxVS CodePostmanpgAdmin 4MySQL Workbench

Chapter 06 — Selected projects

Engineering, in practice

Backend systems, full-stack products and AI projects. Each one links to its source on GitHub.

01AI · Generative AI · RAG

Built with

RAG

Transcription

Summarization

Project 01 / 06AI · Generative AI · RAG

VideoRAG

Makes video and audio content searchable and easier to understand through transcription, summarization and Retrieval-Augmented Generation, with conversational interaction over processed content.

Features

  • Video and audio processing with speech transcription
  • AI-generated summaries and information extraction
  • Retrieval-Augmented Generation for conversational interaction with content

Built with

RAGTranscriptionSummarization
View on GitHub ↗
02Backend Engineering · Financial Systems

Built with

Node.js

Express.js

MongoDB

JWT

Cookie Auth

Project 02 / 06Backend Engineering · Financial Systems

LedgerCore

A modular backend system for account management, authentication and financial transaction workflows, focused on secure architecture, reusable services and reliable transaction management.

Features

  • JWT and cookie-based sessions with token blacklisting
  • Account management APIs and transaction workflows
  • Reusable CRUD services and centralized error handling
  • Layered architecture with email integration

Built with

Node.jsExpress.jsMongoDBJWTCookie Auth
View on GitHub ↗
03Full-Stack · Service Marketplace

Built with

MongoDB

Express.js

React.js

Node.js

Tailwind CSS

Razorpay

Project 03 / 06Full-Stack · Service Marketplace

SoulToConnect

An astrology service platform connecting users with verified pandits and astrologers. Built by a 2-member team.

Features

  • JWT authentication and role-based access control
  • Pandit/astrologer profiles, booking and scheduling
  • Reviews and ratings, Razorpay payments

Built with

MongoDBExpress.jsReact.jsNode.jsTailwind CSSRazorpay
View on GitHub ↗

More work

Chapter 07 — Achievements

Milestones and recognition

Competitive programming, innovation challenges, national examinations and scholarships.

  • 600+

    DSA problems solved

    Solved across LeetCode and GeeksforGeeks.

  • Top 100

    Global Innovation Challenge

    Shortlisted among the Top 100 teams at Design Thinking Day 2026, CMR University.

  • 97th

    Percentile, JEE Main 2023

    Among the top 3% of candidates nationwide.

  • 2023–27

    Reliance Foundation Scholarship

    Awarded for academic merit and excellence in technology.

Chapter 08 — The next chapter

Let's Build Something Meaningful

I'm always interested in connecting with developers, engineers and people building innovative products. Whether it's a collaboration, an interesting project, or a conversation about software engineering and AI, feel free to reach out.

Get In Touch