Founder · Polymit

Rajat Manhas

Full-stack engineer · Product engineering studio operator · India

I'm the person who's going to write your code.

I've spent the last decade in the merge queue for insurers, food-delivery platforms, IoT hardware, payroll systems and social networks — across seven programming languages and four continents. What I do best is close the last mile between an idea and something running in production. Polymit is the studio I built to bring that same delivery discipline to more teams.

What I work with

Whatever your team already runs, I ship in it.

I'm not loyal to a stack. I'm loyal to what ships. The list below is what I've owned in production — not what I've read about.

Backend

Java 21 Spring Boot 3 JHipster Liquibase Node NestJS Express PHP Laravel Python

Frontend

TypeScript React 18 Next.js Angular 6–18 Alpine.js Blade Vite

Mobile

Flutter Riverpod go_router Swift SwiftUI Kotlin Jetpack Capacitor

Data

PostgreSQL MySQL MongoDB Redis Prisma TypeORM Eloquent Hibernate Liquibase

Platform & DevOps

AWS GCP Cloudflare Docker Kubernetes GitHub Actions CircleCI Terraform

Real-time & Messaging

Socket.IO WebSockets pg-boss Redis Streams Firebase Cloud Messaging Bull

Auth & Identity

OAuth 2.0 JWT Sanctum Passport Firebase Auth Cognito

Integrations

Stripe Razorpay Paystack Twilio Vonage nRF Cloud Agora Anthropic API OpenAI

Depth of experience

Honest breakdown — what I've owned vs what I've touched.

Years-of-experience claims are easy to pad. This is more useful: three depth levels, based on what I've actually shipped and maintained in production.

Deep · Production owner

Currently shipping in production. I'll defend architecture calls, own the merge queue, and answer the 3 AM page.

Java 21 · Spring Boot 3 Laravel NestJS Flutter React TypeScript PostgreSQL MySQL Socket.IO Twilio GitHub Actions

Solid · Recently shipped

Shipped in the last 24 months. Comfortable, but I check the docs.

Angular 15+ Swift / iOS Kotlin / Android Redis AWS Lambda ECS Prisma TypeORM Stripe Firebase Agora Anthropic API nRF Cloud

Working · Used in projects

Used in real projects but not my daily driver. I can be productive quickly but will collaborate with a specialist for high-stakes decisions.

MongoDB Kubernetes Terraform GCP Python Vue Next.js Symfony Cognito Auth0 OpenAI API

Won't pretend

Not on my list. If you need this and it's the core of the work, I'll refer you to someone who's genuinely deep.

Blockchain / Web3 C++ / Systems Rust Elixir Salesforce Apex SAP Unity / Unreal

What I've shipped

Real systems, in production, across four continents.

A selection from the last few years. Each one shipped end-to-end with my name on the release.

Multi-country insurance platform

Ghana & Nigeria · In production
Java 21 · Spring Boot 3 · PostgreSQL · React · Liquibase

Quote, issue, finance, renew and settle motor and non-motor policies across two African markets on a single core. Owned the insurer-integration layer and the renewals subsystem rewrite. Live traffic through both markets. Read the case study →

Multi-vertical delivery platform

US Virgin Islands & Cape Verde · In production
Laravel · MySQL · Socket.IO · React · Swift · Kotlin

Food delivery, school meals, parcel service and ride-hailing on one dispatch engine. Led the rideshare vertical end-to-end — fare engine, SSO handoff, super-admin portal. Shipped across two countries, two languages. Read the case study →

LTE + BLE IoT smart collar

Global consumer · Shipped
Flutter · NestJS · PostgreSQL · Prisma · nRF Cloud · Twilio

Wearable pet collar with cellular fallback. SOS alerts fan out to caregivers over SMS and push. Sole author across the mobile app, backend, and cloud provisioning.

Self-hosted deep-linking service

SaaS product · Shipped
Express · MySQL · Stripe · Universal & App Links

A self-hosted alternative to Branch.io for teams that don't want to hand deep-link data to a third party. Sole author of the entire codebase — 48 of 48 commits.

US payroll + tax filing platform

US Virgin Islands · In production
Laravel · Sanctum · MySQL · Blade + Alpine

End-to-end payroll — IRS withholding, W-2 generation, direct deposit, tax filing. Came in as a revival engagement; migrated auth to Sanctum, ran a full schema audit, and delivered a 700-line technical review.

Coaching + video-call platform

AWS Lambda · In production
NestJS 11 · TypeORM · Agora · Anthropic API · GCP Speech-to-Text

Video-call platform with AI-assisted note-taking, coaching workflows, and session archiving. Owned the CI/CD pipeline and the ISMS compliance track.

Invite-gated social network + directory

iOS + Android · Shipped
React/Vite · Express · MySQL · Capacitor 7

Consumer social platform with an invite-gated business directory. Shipped the native iOS and Android shell, the deep-link system, and the invitation infrastructure.

Golf simulator club booking platform

Texas · Web + Mobile · Shipped
Next.js 15 · React 19 · TypeScript · Prisma 6 · MySQL · NextAuth · MUI · React Native 0.81 · Stripe

A membership-based booking platform for a golf simulator club across three Texas locations. Members book time on physical simulator bays under tiered membership rules (three tiers with different concurrent-booking, session-length, and advance-booking limits) with a waitlist system for popular slots. Sole author across the Next.js web platform, the React Native mobile app, the Prisma/MySQL data layer, and the NextAuth-based multi-role auth system. Read the case study →

Markets I've shipped into

Regulated foreign markets, delivered end-to-end.

Every market on this list means shipped code, live users, and dealt with the local surprises — foreign KYC, unfamiliar telecom rails, timezone-lag vendor emails, and regulators who don't respond in 24 hours.

United States
US Virgin Islands
European Union
Ghana
Nigeria
Cape Verde
India

Get in touch

Want to talk about a project?

Send me a message. Tell me what stack you're on, what you're building, and what's in your way. I reply within one working day.