Biswajeet Das

Biswajeet Das

Product Engineer · Backend, SDKs & Full-Stack

👋 Let's work together

About

Product 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 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. @biswaviraj/cc-setup

    Interactive CLI to add your preferred Claude Code plugins and MCP servers to any project. Define your tools once, reuse everywhere with a single command.

    • TypeScript
    • Node.js
    • CLI

  3. @biswaviraj/time-travel

    TypeScript library for managing undo/redo functionality with a time-travel mechanism. Ships with a React hook for seamless integration. Navigate back and forth through state history with ease.

    • TypeScript
    • React
    • JavaScript

  4. PlaYT

    A terminal-based CLI tool that lets users stream or download YouTube audio directly via the command line. Built with Node.js and VLC integration, it caches songs locally to reduce bandwidth usage and improve playback speed. Designed as a lightweight, fun weekend project inspired by minimalistic UX.

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

Coming soon.