Tech Lead · 4+ years · India · Remote

Raj Karbuilds things that scale.

Leading engineering at Metafic — architecting cloud-native products with React, Next.js, Node.js, and AWS. From idea to production, end to end.

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① ScrollMMXXVI
React✦Next.js✦TypeScript✦Node.js✦AWS✦PostgreSQL✦GraphQL✦Supabase✦WebSockets✦System Design✦Docker✦React Native✦React✦Next.js✦TypeScript✦Node.js✦AWS✦PostgreSQL✦GraphQL✦Supabase✦WebSockets✦System Design✦Docker✦React Native✦

01 — Selected Work

Things I've built

02

Geetly

Ad-free music streaming with personalized playlists and seamless playback. Built, designed, and shipped solo.

PersonalNext.js · TypeScript · Supabase · React Query
03

code.rajkar.dev

Real-time collaborative coding interview platform — live cursors, instant session control, zero candidate friction. Built after CodeSandbox killed live collab.

PersonalNext.js · WebSockets · PartyKit · Supabase

02 — About

Code is a craft,
shipping is the point.

I'm a Tech Lead at Metafic. I take client projects from spec to production — React and Next.js on the front, Node.js and Rails services behind them, deployed on AWS. I also run our technical interviews and review most of the code that ships.

A lot of my work is the unglamorous kind: profiling slow pages, untangling legacy modules, designing APIs that survive scope changes. Recent examples — a performance pass that cut a legacy codebase's overhead by 40%, and a WebSocket-based collaborative editor I built because no good tool existed for running live coding interviews.

Off the clock: new tech, open source, and writing about what I learn.

4+

Years shipping

20+

Products delivered

40%

Legacy perf gains

∞

Curiosity

03 — Experience

Where I've been

Jul 2022 — Present

Remote

Tech Lead · Metafic

Leading development across multiple client projects — architecting cloud-native systems on AWS with Node.js, React, and Next.js.

  • Architected cloud-native solutions powering products across industries
  • Cut legacy codebase overhead by 40% through performance and maintainability work
  • Run technical interviews and mentor engineers on code quality
  • Own internal backend infrastructure end to end

Feb 2022 — Jul 2022

Indore, India

Software Engineer · Metafic

Built and maintained React applications with a focus on unit testing and code quality, shipping scalable web solutions with cross-functional teams.

2019 — 2022

Education

Bachelor of Computer Applications

Dr. B.C. Roy Engineering College, Durgapur

First Class Honors · Coding club, hackathons, built 'College Space' inter-college platform

04 — Toolkit

The stack I reach for

Frontend

  • React
  • Next.js
  • TypeScript
  • React Native
  • Tailwind CSS
  • Zustand
  • React Query
  • Vite

Backend

  • Node.js
  • Express
  • GraphQL
  • REST APIs
  • TypeORM
  • WebSockets

Data & Cloud

  • AWS
  • Supabase
  • Firebase
  • PostgreSQL
  • MongoDB
  • Redis

Practice

  • System Design
  • CI/CD
  • Docker
  • Jest
  • Stripe
  • Mentoring

05 — Contact

Let's build
something good.