Biswajeet Das

Biswajeet Das

Lead Software Engineer · Backend, SDKs & Full-Stack

👋 Let's work together

About

Lead Software Engineer with 6+ years building backend services, SDKs, and full-stack products. Happy in the parts most people skip: data layers, auth, cache invalidation, the wiring that decides whether a system actually works.

Currently Lead Product Engineer at Lightwork AI, building a realtime AI-powered property management platform on NestJS microservices + WebSockets with a Next.js surface.

Previously at Novu, the open-source notification infrastructure. Architected parts of the core workflow engine: multi-step pipelines across email, inbox, SMS, and chat, with subscriber-preference evaluation at every layer.

Shipped the new Workflows API replacing the legacy notification-templates system, built the step-condition system on react-querybuilder + JSON schemas, hardened auth (rate limiting, account lockout, password policy), and worked the DAL (cursor pagination, cache invalidation).

On SDKs: led architecture and build pipeline on @novu/js, cutting bundle size 85% (157KB → 21KB) vs the legacy @novu/notification-center. Created @novu/react and @novu/next from scratch; @novu/react overtook the legacy package in npm weekly downloads within months of launch.

Always looking for hard problems to solve and interesting people to build with.

Experience

  1. June 2025 — Present

    • Architected realtime chat and event-driven workflows on NestJS microservices + WebSockets, backed by MongoDB and Redis.
    • Led full-stack delivery across AI-powered property management features, scoping with CEO and Product and shipping from API to UI.
    • Migrated legacy UI to Next.js + Tailwind + shadcn, improving dev velocity across the team.
    • Set up feature flags and PostHog analytics, and established scalable delivery processes across teams.
    • Next.js
    • TypeScript
    • React
    • NestJS
    • Node.js
    • MongoDB
    • WebSockets
    • Tailwind CSS
    • JavaScript
    • Shadcn UI
    • Microservices
    • Event-Driven Architecture
    • Redis
  2. September 2022 — June 2025

    • Architected parts of Novu's core workflow orchestration engine. The system walks a trigger through a multi-step pipeline across email, inbox, SMS, and chat, with subscriber-preference evaluation at every layer.
    • Shipped the new Workflows API (NestJS, CQRS-style use-cases) replacing the legacy notification-templates system.
    • Built the step-condition system end-to-end on react-querybuilder + JSON schemas (UI + backend), enabling arbitrary per-step rules across workflows.
    • Designed the global subscriber preferences engine end-to-end (DAL → use-case → worker → headless and node SDKs).
    • Hardened auth (rate limiting, account lockout, password policy), added cursor pagination and fixed cache invalidation in the DAL, and built the Twilio-backed Novu SMS provider with Gupshup DLT compliance.
    • Created @novu/react and @novu/next from scratch. @novu/react overtook the legacy @novu/notification-center in npm weekly downloads within months of launch.
    • Led architecture and build pipeline on @novu/js, cutting bundle size 85% (157KB → 21KB) and load time 86% vs the legacy @novu/notification-center. Also architected @novu/client and rewrote it off axios onto native fetch.
    • TypeScript
    • SolidJS
    • React
    • NestJS
    • Node.js
    • MongoDB
    • WebSockets
    • Tailwind CSS
    • JavaScript
  3. March 2021 — August 2022

    Led frontend development for Blink Payment, a Payment Gateway as a Service. Built Blink Pages, integrated Cardstream and SagePay, and implemented features like virtual terminals and repeat payments. Managed deployments using AWS CodePipeline, CodeBuild, and CloudFront.

    • React
    • TypeScript
    • Material UI
    • Node.js
    • AWS CodePipeline
    • AWS CloudFront
    • AWS S3
    • JavaScript
  4. January 2020 — January 2021

    Built responsive UIs for ZipDJ, a music streaming platform. Implemented a custom music player, improved performance using eager loading, and integrated ElasticSearch for faster search. Also worked on integrating Mega.nz cloud storage for Spinvault.

    • React
    • SCSS
    • JavaScript
    • ElasticSearch
    • Bootstrap
    • Node.js

Projects

  1. @novu/react

    React SDK for Novu, built from scratch as a modern, lightweight replacement for @novu/notification-center with faster load, an 85%-smaller bundle, and composable headless primitives. Overtook the legacy package in npm weekly downloads within months.

    • TypeScript
    • React
    • SolidJS

  2. hour.zone

    Timezone comparison for remote teams. Pick two cities, get a 48-hour ledger with 9-to-5 overlap already highlighted. No clock walls, no mental math. Share the URL (hour.zone/bangalore/san-francisco) and everyone sees the same meeting slots. Keyboard-driven for ≤15-second use mid-Slack or mid-calendar invite. No signup.

    • Astro
    • React
    • TypeScript
    • Tailwind CSS

  3. @biswaviraj/cc-setup

    Set up your Claude Code plugins and MCP servers with one command. Define your stack once, reuse it on every project. No more copying configs across repos.

    • TypeScript
    • Node.js
    • CLI

  4. @biswaviraj/time-travel

    Add undo/redo to any React app with one hook. Step back, step forward, or jump ten steps at once through state history. Zero dependencies, fully typed.

    • TypeScript
    • React
    • JavaScript

  5. PlaYT

    Stream or download YouTube audio from your terminal. Local caching means faster replays and less bandwidth. Minimal, fast, no browser needed.

    • JavaScript
    • Node.js
    • Command Line Interface
    • VLC
    • YouTube API
    • CommanderJS
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Blog

Coming soon.