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.
- Selected as part of a small global group identifying AI agent use-cases across the software development lifecycle.
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.
- 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