Sushant KumarFull-Stack, React Native & IoT Engineer — freelance and full-time
Sushant Kumar — terminal-style profile card with a character-rendered portrait

Rendered from the same card on github.com/sushantkr961 · SVG + SMIL, no JavaScript

Available for freelance New Delhi · remote-friendly

Software that ships,
and keeps running.

I'm Sushant — a Full-Stack, React Native & IoT engineer. I take products from idea to the App Store, Play Store, factory floor and production, then keep them running. Currently leading platform engineering at Uptime Linked, and taking freelance builds and full-time conversations.

7K+
users served
2
app stores live
20+
products shipped
3+
years building
6,037
GitHub contributions
119
repositories

what I do

Hire me for the whole build

Web, mobile, backend and the hardware at the edge — one engineer who owns it from scope to store submission.

01

Mobile Apps

Cross-platform iOS + Android apps in React Native — shipped to the App Store and Play Store, not left in a demo.

React NativeExpoFirebaseRedux-Saga
Talk about a mobile apps build
02

Full-Stack Web

Fast, scalable web apps and dashboards with React, Next.js, and Node.js — from marketing sites to internal CRMs.

Next.jsReactNode.jsTypeScript
Talk about a full-stack web build
03

Full Product / MVP

Idea to launched product — web, mobile, and backend built and shipped together. I take ownership end to end.

Web + MobileREST APIsAWSCI/CD
Talk about a full product / mvp build
04

Custom Software, ERP & IoT

Bespoke business software — multi-tenant ERPs, on-premise installs, real-time tracking, and sensor-to-dashboard IoT on Raspberry Pi and ESP32.

ElectronPrismaRaspberry Pi / ESP32Socket.IO
Talk about a custom software, erp & iot build

selected work

Shipped, not shelved

Products people use every day — on the App Store and Play Store, in factories, in schools, in browsers. Newest first.

U
in productionemployer · private

UptimeLinked

Mar 2026 – Present

Keep every factory machine visible, live

Role: Lead engineer · top contributor (490+ commits) · team of 6

Manufacturing IoT platform that turns sensor pulses from the shop floor into decisions a plant manager can act on. Three-phase power meters, cycle counters and temperature loggers stream readings over MQTT; the platform turns them into live Active / Idle / Offline boards, shift-wise production sheets, OEE and productivity scores, automatic downtime tickets with 4M root-cause analysis, energy and carbon reports, and ANDON kiosks on factory TVs. Next.js 16 with ~470 API routes and ~120 Prisma models on MySQL, TimescaleDB for high-volume sensor archives, and alerts over Telegram, WhatsApp and push. Built with the Uptime Linked team; I lead the platform and its roadmap.

3-phase power metersCycle countersNodeMCUTemperature / BMS loggers
Next.jsTypeScriptPrismaMySQLTimescaleDBMQTTFirebaseTelegram BotAWS S3Recharts
I
in productionemployer · private

Intelli-Edge

2026

Read machines from a Raspberry Pi and phone home

Role: Team build · I own the device sync, health and update paths

A Python agent that runs on a Raspberry Pi bolted next to the machines. It reads 11 digital inputs and 4 current transformers through an Arduino Nano, plus a Modbus RTU energy meter where one is fitted, and reports one row per machine per time window to UptimeLinked. It runs as a systemd service, queues uploads atomically so a power cut never corrupts data, provisions its own device identity, and self-updates from a signed manifest. Built with the Uptime Linked team.

Raspberry PiArduino NanoCurrent transformers (CT)Modbus RTU energy meter
PythonRaspberry PiArduino NanoModbus RTUsystemdREST
live · storeemployer · private

LoadingWalla app

Jan 2024 – 2026

Move India's trucks with live GPS

Role: Built the app · led the team

Logistics marketplace connecting shippers with verified truck operators across India. Post a load, match a truck, book, pay through Razorpay, and follow the shipment on a live map fed by Traccar GPS devices. Includes a toll calculator for route costing, KYC through Aadhaar and DigiLocker, in-app chat and push alerts. Live on Google Play.

TypeScriptReact NativeRedux-sagaFirebaseRazorpayTraccar
ZH
live · storeemployer · private

ZFour HRMS · web + mobile

2024 – 2026

Clock in from anywhere, verified

Role: Project lead · team of 5

HR suite shipped to the App Store and Play Store: attendance with geo-fenced and trusted-Wi-Fi clock-in, biometric device sync, leave and regularisation, payroll and payslips, reimbursements and loans, a recruitment ATS, assets, helpdesk tickets, company policies, training videos and an internal social feed. Laravel backend with granular RBAC; React Native app with Redux-Saga, Firebase push, maps and PDF payslips. Improved performance by 30% for 7,000+ users.

LaravelPHPMySQLReact NativeRedux-sagaFirebase
SM
sourceown product

School Management System

2026 – Present

Run a whole school from one installer

Role: Own product · built solo

A complete school ERP that installs from a single desktop shortcut. An Electron supervisor boots a bundled MariaDB, an Express API and a Next.js server, then opens a setup wizard — the school's IT admin installs once, and hundreds of teachers, students and parents connect from their own devices with nothing to install. A Cloudflare tunnel makes the parent portal reachable without port forwarding or a static IP. Multi-branch isolation is enforced structurally by a Prisma extension that injects the branch scope into every query. 81 tables across 13 modules, 281 unit tests plus 19 isolation tests against a real database. A cloud multi-tenant mode with a vendor console was added in July 2026.

TypeScriptNext.jsElectronExpress.jsPrismaMariaDB
livefreelance

Indulge Global

Aug 2024 – Nov 2024

Launch a luxury-deals app on iOS and Android

Role: Freelance · frontend and API integration

Lifestyle app offering exclusive deals, curated products and premium services across fashion, travel, dining and entertainment. I built the React Native frontend from Figma and wired the APIs: personalised recommendations, secure payments and bookings. Shipped to both stores.

TypeScriptReact NativeXcodeFigma
livefreelance

Jas Oberoi Group

May 2024 – Jul 2024

Put an $800M real-estate team online

Role: Freelance · built solo

Website for a leading real-estate team in Surrey, BC with over $800 million in career sales. Next.js frontend with listings and consultation flows, backed by Node, Express and MongoDB. Delivered end to end as a freelance build.

Next.jsTypeScriptMongoDBNode.jsExpress.js

Industrial IoT at Uptime Linked

Sensors on factory machines → live dashboards, relays and reports. 2026 – present.

Machine Mate

in productionemployer · private

Drive factory-floor TVs and relays from the cloud

A Raspberry Pi 4 that hangs behind one or two TVs on a factory floor. It only ever calls out: every few seconds it asks the server what each screen should show, renders the dashboards with a PySide6 / QML renderer on two HDMI outputs, and drives five GPIO relays — red, yellow and green stack lights, a buzzer and a machine interlock. If the network drops it keeps showing the last data marked stale and fails every relay open after a 75-second grace window. Ships with a one-line installer, A/B self-update with rollback, and an mmctl command for status, logs and reset. Built with the Uptime Linked team.

Team build · I own the server API, relay control spec and device runbook

Raspberry Pi 45-channel GPIO relaysStack lights + buzzerDual HDMIPythonPySide6 / QMLRaspberry PiGPIOsystemdNext.js
2026

ESP32 Modbus Gateway

in productionemployer · private

Bridge RS485 energy meters to the internet

ESP32 firmware that polls RS485 / Modbus RTU devices — starting with the Selec MFM376 three-phase energy meter — from a manifest the server hands it, then uploads readings as JSON over HTTPS. Handles Wi-Fi management, configuration in EEPROM, SD-card buffering while offline and a hardware reset button, on a custom PCB. Built with the Uptime Linked team.

Team build · firmware planning, server API and test server

ESP32MAX485 transceiverSelec MFM376 energy meterSD cardC++ (Arduino)ESP32Modbus RTURS485HTTPSExpress
2026

UptimeLinked Energy

in productionemployer · private

Turn power meters into shift-by-shift energy reports

Energy monitoring app for factories: shift and hourly energy reports, machine run-time derived from consumption for customers with energy-only sensors, PDF and Excel exports, and alerts through a Telegram bot. A Next.js PWA over Prisma and MySQL; the ESP32 gateway firmware that feeds it lives in the same repo.

Contributor · reports and run-time derivation

Next.jsPrismaMySQLPWATelegram BotjsPDF
2026

TaktBoard

in productionemployer · private

Trace every order from batch to dispatch

Production planning and traceability MES for discrete manufacturers. Customer orders become batches that move through a visual workflow designer — material receipt, processing, assembly, quality check, packaging, warehouse, with outsourced stages — with pick lists, per-stage rejected and rework counts, QR / barcode scanning, OEE and operator analytics, and an AI assistant powered by Claude. Being merged into UptimeLinked as sellable module bundles.

Merge lead · planned and lead the TaktBoard → UptimeLinked merge

Next.js 16React 19PrismaMySQLReact FlowTanStack Query
2026

Upstream CRM

in productionemployer · private

Get upstream of every deal

Sales CRM with a drag-and-drop kanban pipeline, deal lifecycle with stages and probabilities, contacts and companies, a product catalogue with margins, activities and reports. Connected to UptimeLinked through signed webhooks so support and sales share one customer record.

Core contributor (30+ commits)

Next.jsTypeScriptMySQLNextAuthdnd-kitRecharts
2026

Upstream CRM app

in productionemployer · private

Close deals from the phone

Expo companion app for the CRM: deals with role-based permissions, push notifications, secure token storage and haptics, routed with expo-router.

Built solo

React NativeExpoexpo-routerTanStack QueryNativeWind
2026

UptimeLinked app

in productionemployer · private

Put the factory dashboard in a pocket

React Native shell that wraps the platform for Android and iOS, with native file downloads and viewers for exported reports.

Built solo

React NativeWebViewTypeScript
2026

OCR scanner

archivedemployer · private

Read labels with the camera

React Native prototype using Vision Camera with an on-device OCR frame processor to read part labels and meter displays and copy them to the clipboard — groundwork for camera-based data entry on the floor.

Prototype · built solo

React NativeVision CameraOCRNitro Modules
2026

Logistics & HR platforms

Marketplace, GPS and HR products I built and led at Pantheon Digital. 2023 – 2026.

LoadingWalla website

liveemployer · private

Book trucks from the browser

The web side of LoadingWalla: search and book trucks, post loads, match with operators, live GPS tracking, the toll calculator, OTP-verified contact and agent flows, a blog and support. Next.js App Router with Redux Toolkit, Google Maps and its own API routes, sharing the Laravel backend with the app.

Built solo

Next.jsTypeScriptRedux-toolkitGoogle MapsFramer MotionMySQL
Dec 2024 – 2026Website

LoadingWalla API & CRM

in productionemployer · private

Run the marketplace: bookings, GPS commerce, payments

Laravel backend and admin CRM behind the LoadingWalla apps: trucks, loads, bookings, wallets and Razorpay webhooks, GPS device sales with plans and installs, toll-plaza pricing, KYC (Aadhaar, DigiLocker, Signzy vehicle checks), field-agent attendance and visits, blogs and help desk. MySQL for business data, MongoDB for high-volume GPS pings, Redis and Pusher for realtime.

Backend and admin CRM

LaravelPHPMySQLMongoDBRedisRazorpay
2024 – 2025

ZFour Realtime Tracking

in productionemployer · private

Track every field employee, live

Three-part system: a React Native app that keeps sending location in the background even when closed (with battery, network and speed), an Express + Socket.io backend on MySQL, and a Next.js dashboard with Leaflet maps showing live positions with animated movement and session playback. Deployed on AWS EC2 and RDS.

Built solo · app, backend, dashboard, AWS

React NativeExpress.jsSocket.IOMySQLNext.jsLeaflet
2025

Geotracking API

in productioncontract · private

Ingest GPS at scale, smooth the noise

High-frequency location ingestion service. The API acknowledges pings instantly into a Redis Stream, a worker batches them into MySQL, and analytics simplify tracks with the Ramer–Douglas–Peucker algorithm, detect stops and flag offline gaps. Authenticates with the client's existing Laravel tokens.

Built solo for a client · repo lives in their organisation

TypeScriptExpress.jsRedis StreamsMySQLJest
2026

ZFeed

in productionemployer · private

Give employees a company feed

Internal social feed for the HRMS: posts by type, likes on posts and comments, comment threads, my-feed versus company feed and a user directory. Next.js 15 App Router with API routes proxying the HRMS backend and Redux-Saga state.

Built solo

Next.jsTypeScriptRedux-sagaTailwind CSS
2025

HRMS (Node rewrite)

archivedemployer · private

Rebuild the HRMS on Node

Node and Sequelize re-implementation of the ZFour HRMS with 24 models, BullMQ job queues on Redis, S3 uploads and a Next.js frontend — the migration path off Laravel.

Built solo

Node.jsExpress.jsSequelizeMySQLBullMQRedis
2026

Earlier & open source

Full-stack builds from the first years — source on GitHub.

SkMart

liveopen source

Sell online with a live line to the store admin

MERN e-commerce store: catalogue with categories and reviews, cart and order flow, PayPal payments, an admin dashboard with sales charts, and a real-time Socket.IO chat between shoppers and the store admin. JWT auth hardened with helmet, plus database seeders.

ReactNode.jsExpress.jsMongoDBSocket.IORedux

Tripadvisor Clone

liveopen source

Browse and book hotels, Tripadvisor-style

Hotel browsing with debounced search and full account management — signup, login and password reset over email via Nodemailer — plus an admin dashboard behind private routes. TypeScript Express and Mongoose backend; Chakra UI and Redux frontend.

TypeScriptReactExpress.jsMongoDBChakra UIRedux

HLS Video Player

sourceopen source

Play HLS streams inside a React Native app

Expo app pairing an instrumented WebView with a custom HLS player on expo-video: play / pause, mute, ±10s jump, fullscreen and a multi-stream selector, with controls kept in sync with the player's own state. Local notifications fire when web content finishes loading.

TypeScriptReact NativeExpoHLSexpo-video
Jan 2026Source

Workflo

sourceopen source

Organise work on a Kanban board

Column-based task board on the Next.js App Router with API routes for auth and task CRUD, Redux Toolkit on the client, Mongoose for persistence and JWT sessions.

TypeScriptNext.jsRedux-toolkitMongoDBTailwind CSSJWT Auth

MERN Chat App

sourceopen source

Chat one-to-one and in groups

Messaging app with one-to-one and group chats, JWT authentication and a Chakra UI frontend. Chat state flows through a React context provider; the backend models users, chats and messages separately.

ReactNode.jsExpress.jsMongoDBChakra UIJWT Auth

two ways to work together

Freelance build, or full-time hire

Pick the door that fits. Either way you get the same engineer who ships and stays.

for clients

Start a freelance project

Taking on 1–2 product builds per quarter.

  • Fixed scope, fixed quote, weekly demos
  • Web + mobile + backend from one engineer
  • Store submission and deployment included
  • 30 days of fixes after launch

for hiring managers

Hire me full-time

Product Lead at Uptime Linked today. Open to the right next role.

  • Full-Stack / React Native / IoT lead roles
  • 3+ years shipping, led teams of 5–6
  • Hybrid in New Delhi or remote
  • Resume and references on request

how a project runs

Four steps, no surprises

Taking on 1–2 product builds per quarter. Here is what working with me looks like.

  1. 1

    Scope call

    30 minutes on what you're building, who it's for, and what "done" looks like. Free.

  2. 2

    Fixed plan & quote

    A written scope with milestones, a price, and a timeline — no surprises later.

  3. 3

    Build in weekly demos

    You see working software every week and can steer while it's cheap to change.

  4. 4

    Ship + 30-day support

    Store submission, deployment, handover docs, and a month of fixes on me.

career

Where I've shipped

Uptime Linked · Hungrybulb Technologies

Full Stack Developer & Product Lead

Uptime Linked · Hungrybulb Technologies

Lead product development across 6 platforms (2 internal, 4 global) for an Industrial IoT company, managing a team of 6 engineers from architecture to delivery. Build cross-platform mobile and web apps with React Native, React, Node.js, and TypeScript, and set the team's CI/CD and code-review standards on AWS.

Mar 2026 — present
New Delhi · Hybrid
Pantheon Digital Pvt. Ltd.

Software Developer → Project Lead

Pantheon Digital Pvt. Ltd.

Promoted to project lead within a year, directing a 5-member team across 3 concurrent products. Built and shipped LoadingWalla — a logistics platform with real-time GPS tracking (Android app + website) — and an HRMS suite live on the App Store and Google Play. Improved overall application performance by 30% for 7,000+ users (~33,000 requests/day).

Apr 2023 — Feb 2026
Saket, New Delhi
Masai School

Masai School

Full Stack Web Development Program

Sep 2022 — Feb 2023

Aryabhatta Knowledge University

Aryabhatta Knowledge University

Bachelor's Degree in Mechanical Engineering

2016 — 2020

Central Board of Secondary Education

Central Board of Secondary Education

Senior secondary

2014 — 2016

toolbox

From the sensor to the store listing

Languages, frameworks and the hardware I've wired into software.

Languages
TypeScriptJavaScriptPythonC++ (Arduino)JavaKotlinPHPSQLHTMLCSS
Frontend
ReactNext.jsReduxRedux-toolkitRedux-sagaTanStack QueryTailwind CSSChakra UIMaterial UIFramer MotionRadix UI
Mobile
React NativeExpoReact NavigationAndroid StudioXcodePlay Store ReleaseFirebase Cloud Messaging
IoT & Edge
Raspberry PiESP32Arduino NanoModbus RTU / RS485MQTTCurrent transformers (CT)3-phase energy metersCycle countersTemperature / BMS loggersGPIO relaysPySide6 / QMLsystemd
Backend
Node.jsExpress.jsPrismaMongooseREST APIsJWT AuthSocket.IOZodLaravelTemplate Engines
Databases
MongoDBMySQLMariaDBFirebase
Tooling & Delivery
ElectronDockerGitVitestpnpmVercelNetlifyGitHub PagesFigmaPostman
Integrations
RazorpayPayPalTraccar GPSCloudflare TunnelNodemailer

Let's build something that runs.

Hiring for a role or have a product in mind? Tell me what you're building — I reply within a day.