Languages
- TypeScript
- JavaScript (ES6+)
- HTML5
- CSS3
Mayank Jhunjhunwala — Senior Fullstack Engineer
I build things because they need to exist.
Kolkata, India
I'm a Senior Fullstack Engineer based in Kolkata with five years of experience across adtech, hospitality, e-commerce, defence, and real estate. I currently rebuild the web platform for Leading Hotels of the World at Merkle, and independently consult for international product startups. I started at 3.5 LPA and grew 7x in five years — not through a plan, but by consistently shipping things that mattered and staying curious enough to keep learning. I write technical content, publish open-source tooling with real adoption, and build side products that solve real problems. I'm looking for international remote roles or contracts where I'm treated as a peer, not cheap labour.
Open to international remote roles and contracts·
Skills
Frameworks & Libraries
- React
- Next.js
- Redux Toolkit
- Node.js
- React Native
CMS & Cloud
- Contentful
- Cloudinary
- AWS (AppSync, serverless)
- Vercel
- Azure
Tooling
- ESLint (custom plugins)
- Husky
- CI/CD
- IndexedDB
- PWA architecture
Work Experience
Merkle
Senior Software Engineer
April 2025 – Present · Remote
Merkle, a Dentsu Company
- Rebuilding the web platform for a an elite hospitality alliance, from the ground up — new codebase, fresh UX, expanded feature set. Sole engineer responsible for the full technical stack while other engineers focused on single domains.
- Architected the frontend in Next.js and TypeScript on a Contentful CMS — multilingual support, component architecture, and automated content authoring workflows.
- Integrated a multi-system backend across AWS AppSync, a property management system (PMS), and SynXis for real-time pricing and availability data.
- Designed Cloudinary-based Digital Asset Management workflows with Contentful content delivery, deployed on Vercel.
- Owned GTM implementation and full analytics instrumentation alongside frontend and backend delivery.
- Leading a development tribe in an org-wide initiative to implement billable AI agents across the SDLC — identifying high-impact use cases and architecting automated solutions to drive operational efficiency and new revenue streams.
- Completely owned the payments module.
Tech Mahindra
Senior Software Engineer
September 2023 – March 2025 · Remote
Tech Mahindra. Project: Microsoft — Bing Ads platform
- Worked on the React frontend for risk and enforcement modules within Microsoft's Bing Ads platform — a large-scale, high-traffic adtech system serving millions of advertisers globally.
- Cut first-load time by 40% through strategic code-splitting and lazy loading.
- Reduced CI pipeline build times by 20% through build configuration improvements.
- Improved load time of a graph-based component by as much as 50% by virtualising it.
- Introduced Husky pre-commit hooks and full TypeScript coverage for the Redux layer, enforcing type safety across the team codebase.
PwC India
Technology Consultant
September 2021 – September 2023 · Remote
Global professional services firm
- Led frontend development across D2C, B2C, and B2B e-commerce platforms for The DS Group (Dharampal Satyapal Group), a major Indian FMCG conglomerate.
- Led a team delivering Next.js storefronts with device-specific experiences across web and mobile.
- Built and shipped cross-platform iOS and Android apps using React Native.
- Designed an optimistic update strategy for cart interactions, eliminating concurrency bugs and enabling real-time cross-device sync.
- Engineered a custom NextAuth.js integration to meet enterprise authentication requirements.
- Mentored four junior engineers and served as primary technical liaison with senior stakeholders.
- A series of portals for North Eastern Regional Power Committee - NERPC, with the objective to digitize energy transactions, auditing, billing, and scheduling. (SAMAST)
Infosys
System Engineer
November 2020 – August 2021 · Hybrid
Global IT services firm
- Developed automation scripts for the Finacle Treasury banking platform.
Projects
PK Chai
Ordering system for a Kolkata eatery handling midnight delivery across 4 college hostels. Mobile-first admin panel with 30-minute slot batching and hostel-block grouping. Real users, real revenue.
- Next.js
- Neon DB
- Tailwind CSS
Vishuddha Comics
A free, frictionless platform for discovering comics — built because it needed to exist. Not monetized. Not trying to be. This is a value made into a product: the platform I would have wanted to find.
- Next.js
- Neon
- Cloudinary
eslint-plugin-contentful-migrations
Enforces GraphQL resolver annotations on Contentful + Cloudinary migration scripts.
- ESLint
- TypeScript
Hotel Reception OCR
Digitizes hotel guest check-in by extracting structured data from ID cards via OCR.
- OCR
- Node.js
- TypeScript
Gemini + Sheets + WhatsApp Bot
Order management and inventory for a bakery — operated entirely via WhatsApp, no app required. Powered by Gemini for natural language understanding.
- Gemini API
- Google Sheets API
- WhatsApp Business API
- Node.js
eslint-plugin-redux-tsc
Enforces typed Redux hooks for IntelliSense and type safety across a codebase.
- ESLint
- TypeScript
- Node.js
Moebius
AI-powered project historian for codebases. An MCP server + VS Code extension that generates versioned, queryable documentation by observing file changes and AI chat sessions in real time. Captures not just what changed but why — using the prompts developers already write. Built on MCP protocol before it was widely adopted.
- Node.js
- MCP
- VS Code Extension API
- TypeScript
Certifications
- Contentful Certified Professional — Contentful
- Cloudinary Certified Implementation Specialist — Cloudinary
- Microsoft Azure Fundamentals — Microsoft
Education
Jadavpur University
Bachelor of Engineering — Electrical Engineering
2016 – 2020 · Kolkata, India
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This is my first post on BlueSky.
post · completed
This is my first post on BlueSky. The premise is exactly what I thought web3 would be like. I am still trying to wrap my head around the at:// protocol and all the pieces that fit together for it but it seems very promising. Let's see where this takes me.
Lanterns
tv_show · in_progress · 8/10
- Sci-Fi & Fantasy
- Mystery
- Action & Adventure
Network: HBO
I am not a big fan of Hal Jordan. I have never been. But the portrayal is pretty nice. I always preferred John over him (Kyle's my guy). But the show is turning out to be great. Call it true detective, call it whatever, it's good TV.
Marvel's Spider-Man 2
video_game · completed · 10/10
- Hack And Slash
- Adventure
The game improved on almost every mechanism over the 2 earlier ones. The first game would always have a special place in my heart but I would defend this game against all of the criticism people are giving it. It really plays super well, maybe not the story truly, but that's a minor setback. It's still a 10/10 game for me and I would be replaying it right after the 1st one everytime.
Sandman Mystery Theatre Compendium Two
book · completed · 9/10
- Comics & Graphic Novels
- Graphic Novels
- Superheroes
author: Matt Wagner
Vol 1 was amazing. Little uncomfortable for me given it's sexual violence content but the stories were still amazing. Vol 2 follows closely, and lands expectations. I thought I would see a big fall in quality once Wagner is off, but Mr. Seagle really rose up to the challenge and produced incredible stories. It did slouch in the middle, specially with the cannon stuff, but came back stronger.
Spider-Man: Brand New Day
movie · completed · 10/10
- Science Fiction
- Action
- Adventure
director: Destin Daniel Cretton
Amidst all the multiversal commotion, these are the kind of grounding stories that touched my heart. I have always been a spiderman fan, and this is how I want to see my Peter Parker. MCU bought in a very different version; movies were cool but never quite hit home like this one did. Love you spiderman. My one critique, made Punisher kid friendly and it did upset a lot of hardcore Punisher fans.