Jalaj Kumar
Full-Stack Developer
I started coding in 2023 with zero formal training — just JavaScript, Python, and YouTube tutorials. Within a year, I'd built full-stack applications, contributed to open-source projects, and deployed production infrastructure on AWS.
My approach is learn-by-building. I pick real problems, ship working solutions, and figure out the gaps along the way. That's how I went from writing my first React component to architecting VPC networks with auto-scaling groups handling 100K+ concurrent connections.
Currently in my final year of B.Sc. Computer Science at Delhi University, looking for full-stack or SDE roles where I can contribute from day one.
Experience
Freelance Full-Stack Developer
Self-employed
Built and deployed an event management platform for a client. Handled the full project lifecycle from requirements gathering to AWS production deployment. Infrastructure load tested to 1,00,000 concurrent users.
Event Technology Lead
Blitzkrieg '23, Delhi University
Architected the official event website serving 1,500+ concurrent users with zero downtime. Led a 20+ member cross-functional team. Streamlined vendor payments and registration workflows, reducing admin overhead by ~40%.
Open Source Contributor
stdlib
Contributed 4–5 merged PRs to stdlib, a large JavaScript standard library. Participated in code reviews, wrote tests, and followed open-source contribution workflows as part of GSoC preparation.
Projects
Event Management Platform
- —Built and delivered a full event management platform for a real client
- —Deployed backend on AWS with public/private VPC subnets, PostgreSQL on a private EC2 instance, and an Application Load Balancer in front of an Auto Scaling Group
- —Load tested to 1,00,000 concurrent users with zero downtime
Prosperia
- —AI-driven platform that assesses skills and interests, then generates personalised career roadmaps across 10+ tracks
- —Vertex AI for dynamic recommendation generation; JWT auth with secure session management
- —Multi-path navigation so users can explore different careers without restarting the assessment
Lord of the Board
- —Multiplayer whiteboard for distributed teams — real-time drawing and collaboration
- —Sub-100ms sync via LiveBlock API + WebSockets; JWT auth with persistent sessions
- —Responsive UI optimised for desktop and tablet
stdlib — Open Source
- —4–5 pull requests merged into stdlib, a large JavaScript standard library
- —Worked within an existing codebase, wrote tests, and collaborated through code review
- —Prepared as part of GSoC application process
Tech Stack
Education
B.Sc. (Hons.) Computer Science
Delhi University · 2023 – Present
Class XII — Science (PCM)
Cambridge School · Passout 2023
Class X
Cambridge School · Passout 2021
Get in Touch
Available for remote full-time or internship roles.