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Suman Dey - Senior Full Stack Developer

Suman Dey 

Senior Technical Lead

ROITech8+ Years
West Bengal, India
Available
Resume

Technical Blog

Insights on full stack development, modern web technologies, and lessons learned along the way

8 articles
8 featured

Featured Articles

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Featured

React 19 in Production: What Actually Changed After Migrating aiPM and The Weekend Stores

I migrated two production Next.js 15 apps to React 19 — aiPM (multi-tenant SaaS with real-time AI streaming) and The Weekend Stores (e-commerce with complex cart state). Here's what the React Compiler actually did to bundle size and re-renders, where Actions simplified real form flows, and the one breaking change that cost me three hours.

React 19ReactNext.js 15+5
11 min readRead more
Featured

OpenAI vs Gemini in Production: What I Learned Shipping AI Features Across 3 Real Products

I've used OpenAI in production across three products — 92% accuracy resume parsing in TMS, RAG pipelines with pgvector in aiPM, and recipe search in YesCozy. Here's what the comparison actually looks like when you're choosing a model for a real system with real accuracy and latency requirements, not a chatbot demo.

OpenAIGoogle GeminiAI+6
12 min readRead more
Featured

How I Use Claude Code as a Senior Technical Lead: My Real Workflow Across 4 Production Projects

I'm a Senior Technical Lead running 4 live production systems simultaneously — aiPM, TMS, The Weekend Stores, and YesCozy. Here's exactly how Claude Code fits into my daily workflow, what it actually changed, and the specific patterns I use on real codebases, not toy examples.

Claude CodeVS CodeSenior Developer+6
14 min readRead more
Featured

Bun vs Node.js: Why I Stayed on Node for 4 Production Systems (And Where Bun Actually Helps)

I evaluated Bun as a runtime replacement for my Node.js backends across TMS (Express + TypeORM + PostgreSQL, 1M+ records), aiPM (Fastify + BullMQ + Redis), and The Weekend Stores (Fastify + Drizzle ORM). Here's what compatibility actually looks like on a real enterprise stack, where the performance claims hold up, and why I use pnpm instead of bun install.

BunNode.jsJavaScript+6
10 min readRead more
Featured

Suman Dey Built Raktamitra — Blood Donation App for Raktamitra Ramnagar NGO

Suman Dey (imsumandey), Senior Technical Lead at ROITech Consulting, built a free blood donor finder app for his hometown NGO in 7 days. Raktamitra Ramnagar — a voluntary blood donation organisation in Ramnagar, West Bengal — needed a better way to connect donors with patients in emergencies.

Blood Donation AppNGO TechRaktamitra+17
8 min readRead more
Featured

Build Your First Custom GPT Web App: Zero to Hero Guide

Ready to add AI superpowers to your web app? This comprehensive guide takes you from complete beginner to building production-ready GPT integrations. No fluff, just practical code and real-world examples that actually work!

OpenAIGPTAI Integration+6
18 min readRead more
Featured

AI-Powered Frontend Development: The 2025 Reality Check

Forget the hype – here's what's actually happening with AI in frontend development right now. After diving deep into the latest tools and techniques, I'm sharing the real impact, the surprising limitations, and the game-changing workflows that are reshaping how we build interfaces.

AIFrontend DevelopmentGitHub Copilot+5
9 min readRead more
Featured

Welcome to My Technical Blog

Welcome to my technical blog! Here's what you can expect from my upcoming posts about full stack development, modern web technologies, and lessons learned along the way.

IntroductionFull StackWeb Development+2
3 min readRead more

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