Shape
Convert requirements into screens, flows, data needs, edge cases, and release scope.
10+ years shipping production software
I build the whole product, not just one layer.
Senior product engineer who takes web, mobile, and native macOS products from rough idea to verified release: UX, frontend, backend APIs, data, cloud, applied AI, QA, deployment, and ongoing operation.
Why hire me
One engineer covering the complete delivery chain.
The value is not just knowing tools. It is being able to connect the product, data, integration, deployment, and release decisions without waiting on a separate team for every handoff.
Design UI
Build responsive web and mobile interfaces from Figma, rough wireframes, or direct product direction.
Build APIs
Create auth, REST APIs, background jobs, integrations, real-time workflows, and backend services.
Model Data
Design PostgreSQL, MongoDB, Firebase, Redis, upsert, caching, sync, and event-driven data flows.
Deploy
Handle Firebase, AWS/GCP-style cloud services, Docker concepts, CI/CD, environment setup, and rollout checks.
Operate
Debug production issues, improve performance, validate releases, and keep the product moving after launch.
Proof by product type
Delivered across mobile apps, platforms, ops systems, and AI-enabled workflows.
Consumer Mobile Apps
Flutter and native Android products shipped to Play Store and App Store.
- Classify, Lion Mountain, Sav Money, MatchMde
- Subscriptions, media, chat, payments, statistics, rewards
Healthcare & Workforce
Operational tools where reliability, location, scheduling, and real-time communication matter.
- Shift Alerts, GuniTime, clinician scheduling
- Geolocation, invoices, rosters, offline modules
Business Systems
ERP, testing, inventory, accounting, payroll, and process automation systems.
- Tea ERP, MTAS, GuniSMS
- APIs, reporting, automation, campaign and device flows
AI-Ready Engineering
Modern backend and product patterns for LLM-enabled applications.
- LLM workflows, RAG, agentic AI, agent decoding, prompt design
- Redis, Kafka, PostgreSQL, queues, observability-minded debugging
Stack coverage
A practical engineering stack, connected end to end.
Frontend
ReactJS, NextJS, TypeScript, JavaScript, Tailwind CSS, Bootstrap, responsive UI
Mobile
Flutter, Dart, Native Android, Java, Kotlin, store publishing, offline-first app behavior
Backend
NodeJS, Python, REST APIs, auth flows, integrations, background jobs, event-driven workflows
Data
PostgreSQL, MongoDB, Firebase, Redis, Kafka, SQL upserts, caching, real-time sync
Cloud & Ops
Firebase, AWS/GCP concepts, Docker concepts, CI/CD, Git, release validation, debugging
AI Layer
LLM workflows, RAG, agent/tool workflows, agent decoding, prompt design, vector search concepts, AI-assisted automation
Open source · July 2026
Recent systems you can inspect, run, and evaluate.
Each repository includes its source, setup path, security boundary, and executable verification contract.
GoalX
Local-first Flutter savings and goal tracker with manual accounts, recurring plans, versioned backup, optional owner-scoped Firestore sync, and review-before-write AI guidance.
Robot/Shift
Open 180-day robotics and ROS 2 field manual with deterministic visuals, interactive maths, portfolio projects, cloud progress, and a security-bounded AI tutor. Next.js 16, React 19, TypeScript, and Firebase.
PDFVoice
Private native macOS PDF audiobook reader with on-device OCR, neural narration, forced alignment, and synchronized word highlighting. Swift 6.2, SwiftUI, PDFKit, Vision, MLX, and ONNX Runtime.
Production product history
Selected shipped products across industries.
Classify
School planner with homework diary, timetable, focus zone, events, clubs, tasks, and progress statistics.
Shift Alerts
Healthcare workforce platform with geolocation clock-in/out, messaging, voice calls, scheduling, invoices, and expenses.
Sav Money
Fintech savings app with goals, rewards, round-ups, auto top-up, card management, challenges, and merchant offers.
Tea ERP System
Field and factory ERP modules for payroll, purchase, production, inventory, sales, machine maintenance, and accounting.
Supporting details
Additional background, kept compact.
Professional record
Senior Full Stack / Product Engineer
Product engineering role · Kolkata · Nov 2017 - Present
- Built and maintained mobile apps, web apps, backend services, APIs, data models, and production workflows.
- Worked across Flutter, Native Android, ReactJS, NextJS, NodeJS, TypeScript, Python, PostgreSQL, MongoDB, Redis, Firebase, and AI-assisted workflows.
Flutter and Native Android Developer
Mobile product role · New South Wales · Jul 2016 - Oct 2017
- Built cross-platform mobile apps and integrated Firebase, Google Maps, push notifications, payment gateways, and REST APIs.
Education and languages
- Post Graduate Diploma, Remote Sensing & GIS · Jadavpur University CAD Centre · 2015 - 2016
- Bachelor of Arts, Geography · A.B.N Seal College · 2012 - 2015
- English, Hindi, Bengali