Full-stack engineer · Kolkata

I build systemsthat hold underreal-world load.

I design the database, build the API and the interface, and run the deployment. Today that means platforms for West Bengal government departments; before that, a CRM/ERP that 13+ solar businesses run on.

Selected work Résumé Matrix Studio ↗
0+
Field staff coordinated in real time
0%
Faster API responses after caching and queues
0+
Businesses live on PVERP
0.0%
Uptime on AWS in production
01About

Full-stack,
with a backend bias.

I’m a full-stack engineer based in Kolkata. Since 2024 I’ve worked on production systems end to end: schema design, APIs, web and mobile clients, queues, caching and AWS deployment. Most of it has been operational software, the kind where a slow page or a lost record has a real cost for the people using it.

At NexIntel Synergy I build platforms for West Bengal government departments, including a system that coordinates 500+ field staff at public events. Before that I built PVERP, a CRM/ERP that 13+ solar businesses now run on.

I also co-run Matrix Studio with two partners, taking on web, mobile and AI work for outside clients, and build side projects such as SanketBani, a 3D Indian Sign Language app.

Online I go by Phinix-BI: the same handle on GitHub and LeetCode.

Education

Bachelor of Computer Application

Techno India University · 2022 — 2025

8.83/ 10 CGPA
  • Full-Stack Development
  • Mobile App Development
  • Java Programming
  • Database Management Systems
01

Own the whole path

I design the schema, write the API, build the interface and deploy it. Fewer hand-offs means fewer places for things to go wrong.

02

Measure, then optimise

I profile first and fix what the numbers point at. At NexIntel that meant caching and background queues: response times down 35%, database load down 40%.

03

Built to be maintained

Typed code, explicit schemas, and access control designed in from the start rather than retrofitted.

02Experience

Roles, and
what shipped in them.

  1. Jan 2025 — PresentSalt Lake, Kolkata

    Software Engineer @ NexIntel Synergy Pvt. Ltd.

    • Built the Mass Gathering and Hygiene Management System for the West Bengal government. It coordinates 500+ field staff at public events, with severity-based incident classification, automated escalation and a live dashboard for senior authorities.
    • Introduced Redis caching and BullMQ queues on high-frequency endpoints. Average response time fell 35% and database load 40% under peak multi-department traffic.
    • Delivered the staff management module for 200+ department users: attendance, duty assignment, shift scheduling and role-based access control.
    • Designed the relational schemas and query plans behind large government datasets; queries stay under 200ms with concurrent departments.
    • Shipped a sanitation logistics platform used across multiple cities for waste-collection routing and hygiene reporting.
    • TypeScript
    • Next.js
    • Express
    • PostgreSQL
    • Redis
    • BullMQ
    • JWT
    • OAuth2
  2. OngoingRemote · Worldwide

    Co-founder · Backend & System Design @ Matrix Studio

    • Co-founded a three-person studio that delivers web, mobile, SaaS and AI-automation projects for outside clients.
    • Responsible for backend architecture, data models and infrastructure.
    • Next.js
    • React Native
    • Node
    • Postgres
    • AI integrations
  3. 2024 — Early 2025Kolkata, India

    Freelance Full-Stack Engineer @ Independent

    • Designed and built PVERP, a solar CRM and ERP, from scratch. It went live with one large solar enterprise and 12+ smaller businesses, with 100+ daily active users covering the full path from lead to completed project.
    • Built 14+ integrated modules: sales pipeline, project management, retail, insurance, accounts and billing, HR and payroll, issue tracking and real-time chat. Also built the React Native app site engineers use in the field.
    • Sent 1,000+ emails a week through a BullMQ queue with no delivery failures. Redis handles sessions, query caching and rate limiting at a 60%+ cache hit rate.
    • Deployed on AWS (EC2, S3) with Docker Compose and kept uptime above 99.5%.
    • TypeScript
    • Next.js
    • Prisma
    • WebSockets
    • Docker
    • AWS EC2
    • S3
    • React Native
03Selected work

Selected work.
Production first, side projects after.

PVERP admin dashboard: project list, stage pipeline and collections
Live · pverp.com
01Solar CRM & ERP · SaaS2024 — now

PVERP

An operating system for solar installers. Leads, site surveys, design and BOM, PM Surya Ghar and DISCOM paperwork (CESC and WBSEDCL), barcode-scanned dispatch, GST billing and after-sales service all share one project record. Multi-tenant, with role-based dashboards and an Android app for field teams.

Live
25+Role-based dashboards
23Project stages tracked
13+Businesses live
99.5%Uptime
  • Next.js
  • TypeScript
  • PostgreSQL
  • Prisma
  • Redis
  • BullMQ
  • React Native
  • AWS
SanketBani preview
02AI · 3D · Mobile2025

SanketBani

Mobile app that turns text and images into animated 3D Indian Sign Language, and recognises signed gestures from video as text. React Native client, Node API with OCR, and a pose-recognition model built on Mediapipe and TensorFlow.

  • React Native
  • Three.js
  • Mediapipe
  • TensorFlow
  • Node.js
4 Code Live
PDF-RAG preview
03AI · Backend2025

PDF-RAG

Chat with your PDFs. A BullMQ worker splits each upload and embeds it into Qdrant; questions retrieve the relevant passages and are answered by Azure OpenAI (GPT-4o mini). Next.js client, Express API, Valkey-backed queue, Docker Compose.

  • LangChain
  • Qdrant
  • BullMQ
  • Express
  • Next.js
  • Azure OpenAI
Code
MindCare preview
04Health · MERN2024

MindCare

Mental-health platform with a guided self-assessment and recommendations, an AI chat assistant on a tuned PaLM model, and appointment booking with professionals.

  • React
  • Express
  • MongoDB
  • Tailwind
  • PaLM
6 Code Live
04The studio

Matrix Studio.
Independent product studio.

From idea to app. We design, build and scale digital products.

A three-person product studio covering frontend, backend and infrastructure. Clients work directly with the engineers building their product, with no account managers in between.

  • Web apps
  • Mobile apps
  • SaaS
  • AI automation
  • E-commerce
  • CRM & ERP
3 foundersRemote worldwide
matrix-studio.in
Client work

Texas Scrappers

Website for a land-services business in Texas · 2025

Have a project?

matrixstudio.outreach@gmail.com

Tell us what you’re building. We reply within a day.

05Stack

Technical stack.
What I use in production.

Languages
  • TypeScript
  • JavaScript
  • Java
  • SQL
Frontend
  • React
  • Next.js
  • React Native
  • Tailwind CSS
Backend
  • Node.js
  • Express
  • GraphQL
  • REST
  • WebSockets
Data
  • PostgreSQL
  • MongoDB
  • Redis
  • Prisma
Cloud & DevOps
  • Docker
  • AWS EC2
  • AWS S3
  • AWS RDS
  • GitHub Actions
Tooling & AI
  • BullMQ
  • JWT
  • OAuth2
  • TensorFlow
  • Qdrant
  • Git
06Contact

Let’s talk about
what you’re building.

Open to new roles and projects. Email is the fastest way to reach me.

officialbiswajitdey@gmail.com
LinkedIn GitHub Résumé
Press play
Midnight Static
Ambient · generated live