Hello, I'm
Varun Kumar
Backend-focused Full Stack Software Engineer with 3+ years of experience architecting scalable backend platforms, microservices, and high-concurrency applications using Node.js, NestJS, TypeScript, Redis, and Next.js.
Architecting Scalable Systems
A little about who I am, what I do, and what drives me.
I am a results-driven Full Stack Engineer who architects high-performance, scalable systems to solve complex business problems. With deep expertise in backend engineering (Node.js & NestJS) and a sharp eye for frontend experiences (Next.js & React), I build resilient applications capable of handling massive traffic at scale.
Whether I'm engineering high-throughput order processing queues or slashing API response times, my focus is always on delivering measurable impact and clean architecture. When I step away from the keyboard, I bring that same drive and strategic mindset to the cricket pitch—always looking to learn, adapt, and push my limits.
Work Experience
My professional journey building scalable software solutions.
Khan Global Studies Pvt. Ltd.
Software Engineer
- Re-architected the legacy Laravel CRM into NestJS, implementing scalable order management, courier partner routing across multiple sales channels, webhook-driven status tracking, image processing, and BullMQ-powered asynchronous workflows handling 1K+ concurrent jobs.
- Built Bot Sphere, a full-stack customer engagement platform (NestJS, React, Redis Streams, Meta Cloud API) delivering WhatsApp campaign automation, a visual chatbot builder, live agent monitoring, embeddable website widgets, and Redis Lua–based fair agent assignment, serving 50K+ users across the KGS Store ecosystem.
- Rebuilt the Khan Global Studies website with a Next.js rebuild (90% SSR), improving SEO rankings by 40% and cutting page load times by 30%.
- Owned Course and Test-Series microservices (Node.js, Knex.js, Objection.js), cutting API response times by 40% and securing premium video delivery for 100K+ students via Akamai EdgeAuth.
- Architected PlayerKit, an open-source video platform, as sole developer — powering secure HLS, YouTube, and MP4 streaming for 100K+ students across the Khan Global Studies ecosystem.
Junior Software Engineer
- Developed the Khan Global Studies React Native application (Android & iOS), delivering JWT authentication, HLS live streaming, offline downloads, and push notifications for 1M+ students.
- Built core Next.js and React features, including a custom video player supporting HLS, YouTube, and uploaded media, improving the learning experience across web platforms.
- Began developing Course and Test-Series microservices using Minima.js, Knex.js, and Objection.js, progressing to end-to-end ownership as a Software Engineer.
Software Engineer Intern
- Delivered 3 production-ready features within the first 3 months using Next.js and React, contributing to a learning platform serving 100K+ students.
Skills & Technologies
A curated set of tools and technologies I use to ship production-grade applications.
Backend
Frontend
Database
DevOps
Tools & Other
Featured Projects
A selection of projects I've built — from open-source libraries to full-stack applications.
PlayerKit
Comprehensive Video Player Monorepo
A complete suite for building modern video experiences. With native support for HLS, YouTube, and MP4 out of the box, it provides a headless playback engine, ready-to-use React components, and a fully-themed UI library that gives you complete control over the viewing experience.
EnvGuard
Type-Safe Environment Variable Manager
A developer CLI tool that enforces environment variable strictness. It automatically validates your .env files against defined schemas, flags missing variables during CI/CD, and generates strict TypeScript types for zero-runtime errors.
- Schema-based validation for .env files
- Auto-generates strict TypeScript typings
- CI/CD integration for missing variables detection
- Zero-config setup with sensible defaults
Explore more repositories
View All ProjectsAcademic Background
The foundation that shaped my engineering mindset.
Bachelor of Technology — Computer Science & Engineering
- Specialized in Data Structures, Algorithms & System Design
- Final year project: Real-time collaborative coding platform
- Active member of the Computer Science Society
Self-Taught Developer
- Problem Solving & Critical Thinking
- In-depth Technical Research
- Self-Motivation & Discipline
- Adaptability to New Technologies
Let's Build Something Amazing Together
Whether you have a project in mind, a role to fill, or just want to connect — my inbox is always open.