Rupam Das — Full Stack AI Engineer
Available for new projectsOpen to freelance & full-time roles

rejisterjack

Full StackAI Engineer

I build production-grade AI applications — from MVP to scale.

95%Test Coverage
0-DTCI/CD Deploys
10K+LLM Reqs/day
Hire Me
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Core Philosophy

Building highly scalable,
intelligent architectures

My approach combines deep technical expertise with a focus on delivering measurable business impact through clean, scalable solutions.

Scale & Performance

Full Stack Web

Expertise in React.js, Next.js, Node.js, and TypeScript. Proven ability to lead 5-engineer teams shipping ERPs for 5,000+ concurrent users with 40% load time reduction and zero production incidents.

LLMs & Agentic Systems

AI Integration

Built GPT-4-powered features, LangChain RAG pipelines indexing 10,000+ documents at 85% retrieval accuracy, and agentic tool-calling chatbots with RBAC-gated tool invocation. Zero-defect AI systems processing 10,000+ requests/day.

WebSockets & Tracking

Real-Time Systems

Owned real-time Git tracker reducing sync latency 93% (3s→200ms). Integrated Samsara ELD APIs and WebSocket for live GPS, diagnostics, and camera feeds — cutting emergency response time 50%.

Zero-Defect Delivery

Quality & CI/CD

Established Vitest + RTL at 95% code coverage. Automated blue-green GitHub Actions pipeline enabling zero-downtime releases across all production environments. Led teams with a zero production incidents standard.

What I Do

Premium software
development services

Whether you need a full application built from scratch or an AI workflow integrated into an existing product, I deliver high-quality, scalable solutions.

MVP Development

From validated idea to launched product in 4–8 weeks. Full-stack React/Next.js builds with auth, payments, and CI/CD — ready for real users on day one.

End-to-end React/Next.js developmentDatabase design & API architectureAuthentication & user management

AI Integration

Add LLM-powered features to any product — RAG pipelines, voice agents, document processing, and custom AI workflows built with production-grade reliability.

GPT-4/Claude API integrationRAG pipeline setup (Pinecone/MongoDB)Voice agents (Vapi/OpenAI Realtime)

Technical Consulting

Architecture reviews, tech stack decisions, team mentoring, and code audits. Async-first with flexible weekly or bi-weekly engagement — no long-term retainer required.

System architecture designCode review & best practicesPerformance optimization

Workflow Automation

Automate repetitive business tasks with custom AI agents and APIs. Connect your software tools, synchronize databases, and streamline operations.

Custom AI agent integrationsZapier, Make, and webhook setupAutomated email & chat response bots
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Developer Utilities

Developer Tools Sandbox

6 of 60+ free developer tools. All processing happens client-side — your data never leaves the browser.

JSON Formatter

Validate, format, and minify complex JSON structures.

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JWT Decoder & Debugger

Decode JSON Web Tokens offline to view headers, payloads, and signatures.

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Password Generator & Checker

Generate highly secure passwords and check their entropy.

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Timestamp Converter

Unix timestamp to Human date conversion made simple.

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Color Converter

HEX, RGB, HSL, OKLCH color converter.

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API Tester

Simple HTTP client for testing APIs.

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Professional Journey

Featured Engineering Work

Frontend Dev Helper — Browser Extension DevTools Suite project screenshot
2024

Frontend Dev Helper — Browser Extension DevTools Suite

A unified Chrome and Firefox Manifest V3 browser extension that consolidates 27 professional frontend debugging tools into a single, Shadow DOM–isolated, keyboard-first developer experience — replacing the fragmentation of 8–12 separate legacy MV2 extensions with one cohesive layer over every page you debug. Ships with an AI-powered DOM analysis engine, an interactive Canvas flame graph, a multi-framework component tree, and Stripe-powered licensing.

  • TypeScript
  • React 18
  • Chrome MV3
  • Firefox MV2
  • Vite
  • CRXJS
  • Tailwind CSS
  • Zod
  • Shadow DOM
  • Web Workers
  • Vitest
  • Playwright
  • Biome
  • Stripe
View Case StudyOpen Source
RAG Starter Kit — Production-Grade AI Document Chat Platform project screenshot
2024

RAG Starter Kit — Production-Grade AI Document Chat Platform

A full-stack, production-ready Retrieval-Augmented Generation platform built on Next.js 15 App Router that lets teams ship an AI-powered document chatbot with hybrid retrieval, enterprise authentication, and real-time collaboration — using 100% free-tier AI providers by default. The architecture spans a 5-stage document ingestion pipeline, pgvector hybrid search with Reciprocal Rank Fusion, SAML 2.0 SSO, Inngest background jobs, and full OpenTelemetry tracing, making it equally usable as a weekend side project or a commercial SaaS foundation.

  • Next.js 15
  • React 19
  • TypeScript
  • PostgreSQL
  • pgvector
  • Prisma
  • Redis
  • Vercel AI SDK
  • LangChain.js
  • OpenAI
  • Google Gemini
  • Inngest
  • Ably
  • NextAuth v5
  • SAML 2.0
  • Stripe
  • OpenTelemetry
  • Tailwind CSS 4
  • shadcn/ui
  • Zod
  • Cloudinary
  • Tesseract.js
  • Vitest
  • Playwright
View Case StudyOpen Source
React Perf Profiler — DevTools Extension for React Performance Engineering project screenshot
2025

React Perf Profiler — DevTools Extension for React Performance Engineering

A Chrome and Firefox DevTools extension that hooks directly into __REACT_DEVTOOLS_GLOBAL_HOOK__ to profile React component render behavior at scale — detecting wasted renders with fiber bitmask decoding, quantifying memoization effectiveness, parsing RSC wire payloads, and predicting render times with TensorFlow.js. All heavy analysis is offloaded to three dedicated Web Workers, keeping the DevTools panel at 60fps across component trees with 10,000+ nodes.

  • TypeScript
  • React 18
  • Chrome MV3
  • Firefox MV2
  • Zustand
  • D3.js
  • Three.js
  • React Three Fiber
  • TensorFlow.js
  • Web Workers
  • IndexedDB
  • Vite
  • CRXJS
  • Immer
  • Reselect
  • Vitest
  • Playwright
  • Biome
View Case StudyOpen Source

View Full Timeline

Explore the complete history of my professional roles, projects, and technical evolution.

Full Experience
20+
Projects Delivered
95%
Client Satisfaction
4+
Years Experience
100%
On-Time Delivery
Client Reviews

Trusted by Founders & Teams

Don't just take my word for it—here's what clients say about working together.

"Rupam delivered our AI Agent Marketplace with a complex 10-stage Azure deployment pipeline that just works — recoverable on failure, real-time status for users, and clean post-purchase credential handoff. His ownership of the full stack is rare."
E
Engineering Lead
Client, PostQode
"The RAG-powered AI assistant Rupam built for our educational platform exceeded expectations. He understood our requirements quickly and delivered a solution that actually works in production. Our students' query resolution time dropped by 60%."
P
Product Lead
Client, EL Nova Labs
"Rupam built our entire fleet management frontend from scratch — GPS tracking, live diagnostics, camera feeds — all running smoothly for 200+ vehicles. His real-time safety infrastructure cut our emergency response time in half."
O
Operations Manager
Client, Big Wings LLC