Zobaer Hossain

Hello! I AmZobaerHossain

(Builds for)AndroidiOS
  • Kotlin
  • Java
  • Jetpack Compose
  • Kotlin Multiplatform
  • React Native
  • TypeScript
  • Firebase
  • Kotlin
  • Java
  • Android SDK
  • Jetpack Compose
  • 🔀Coroutines
  • 💉Hilt
  • 🗄️Room / SQLite
  • 🧩Kotlin Multiplatform
  • React Native
  • TypeScript
  • Firebase
  • 🔗REST / WebSocket
  • 📶Bluetooth LE
  • NDK / JNI (C++)
  • GitHub Actions
  • Redux / TanStack
  • 🚀Expo
  • 🧪Maestro / JUnit / Jest
  • 🤖Claude Code
  • Flutter

Ships secure, reliable Android apps — from BLE devices to U.S. hospitals.

Kotlin · Jetpack Compose · Kotlin Multiplatform · React Native

I'manAndroidEngineer.

The Lash Look — AI Lash Mapping
The Lash Look — AI Lash Mapping
Wedbox — Event Photo Sharing
Wedbox — Event Photo Sharing
SpeakPro — AI Language Learning
SpeakPro — AI Language Learning
NoFlix
NoFlix

Featured Projects

A developer who

Android Engineer — healthcare & fintech apps for clients in the U.S. and Canada.

Dhaka, Bangladesh (GMT+6) · Open to Remote

Building, securing and shipping Kotlin & Java apps for healthcare, fintech, IoT and consumer products.

Security-minded: R8/ProGuard, API tokens in native C++ (NDK/JNI), encrypted BLE communication.

Cross-platform too: React Native (TypeScript), Kotlin Multiplatform and OpenAI Realtime voice.

4+

Years in mobile

7

U.S. hospitals

100K+

Play Store downloads

About
Zobaer Hossain

Android Engineer · Dhaka, Bangladesh (GMT+6) · Open to Remote

Ships secure, reliable Android apps — from BLE devices to U.S. hospitals.

Kotlin · Jetpack Compose · Kotlin Multiplatform · React Native

Education

B.Sc. in Computer Science and Engineering

International University of Business Agriculture and Technology (IUBAT)

CGPA 3.47

Head of Strategic Planning, Hult Prize at IUBAT (2021 – 2022): team leadership, event management, startup strategy

Bengali (Native), English (Full Professional)

My Journey

WorkExperience

Native Android and React Native apps for healthcare, fintech, immigration, edtech and events.

  • Develop and maintain an enterprise medical app live in seven U.S. hospitals: dynamic form submission, MDM integration, real-time updates over WebSocket and an offline sync queue.
  • Built SafeLot, a BLE anti-theft car app with one-tap remote engine disable, encrypted device communication and Google Maps geofencing (Kotlin, Hilt, Coroutines, Retrofit).
  • Built the complete React Native app for TrueAdvance, a U.S. business-funding platform (TypeScript, TanStack Query, WebSocket), plus its Next.js web app.
  • Shipped VisaVerse (React Native CLI, Redux) to both the App Store and Google Play, including all API integration.
  • Built real-time AI voice conversation practice for SpeakPro on the OpenAI Realtime API, plus its GraphQL integration.
  • Built Event Participant Manager: multi-tenant events, bKash payments, JWT auth, offline-first architecture and FCM push notifications.
  • Hardened app security with R8/ProGuard and API tokens protected in native C++ via the NDK/JNI; AI-driven E2E testing with Claude Code and Maestro.

Consumer and IoT Android apps for European products.

  • Developed and maintained Wedbox, a photo-sharing app with 100K+ downloads on Google Play.
  • Worked directly with stakeholders on app growth, priorities and product challenges; tracked feature usage with Firebase Analytics events.
  • Integrated Google Play Billing, Salesforce SDK, Localize and Firebase.
  • Engineered the Moonboon app for smart baby cradles (Java, API integration, broadcast receivers, ESP32 hardware).

Built two Android apps from scratch with Java, Firebase and SQLite/Room.

  • Athraw: educational app with Firebase Authentication, chapter-wise questions and quizzes, and paid tutorials via Razorpay; content updates remotely from Firebase without a new release.
  • PassMyRent: rental app with property listings, search by price or location, payments and real-time chat between tenants and lessors.

Portfolio

Featured Projects

Beauty Tech · AI · React Native

The Lash Look — AI Lash Mapping(01)

An AI facial-scanning consultation app for lash technicians: AI-powered lash mapping personalized to each client's face shape, with a subscription model. Live on the Apple App Store.

React NativeReduxZodFirebaseFastAPIAI
App Store
The Lash Look — AI Lash Mapping screenshot 1

Consumer · Native Android

Wedbox — Event Photo Sharing(02)

An event photo-sharing app with 100K+ downloads on Google Play: guests upload photos by QR code to a shared album with a live slideshow. Integrated Google Play Billing, Salesforce SDK, Localize and Firebase, and tracked feature usage with Firebase Analytics.

KotlinJavaGoogle Play BillingFirebaseSalesforce SDK
App StoreGoogle Play
Wedbox — Event Photo Sharing screenshot 1

EdTech · AI · React Native

SpeakPro — AI Language Learning(03)

An AI English-learning app built for Bangla speakers. Designed and built real-time AI conversation practice on the OpenAI Realtime API, so learners hold live spoken conversations with an AI tutor, and implemented the app's GraphQL API integration. Migrated from React Native CLI to Expo.

React NativeExpoOpenAI Realtime APIGraphQL
Google Play
SpeakPro — AI Language Learning screenshot 1

Security · Native Android · BLE

SafeLot — Anti-Theft Car Security(04)

Pairs with a Bluetooth Low Energy device so drivers can remotely disable their vehicle's engine with one tap. Encrypted device communication, remote control, Google Maps geofencing and a custom UI.

KotlinHiltCoroutinesRetrofitBLEGoogle Maps
SafeLot — Anti-Theft Car Security screenshot 1

Fintech · React Native

TrueAdvance — Business Funding(05)

The complete React Native app for a U.S. business-funding platform (term loans, lines of credit, invoice factoring), built in TypeScript with TanStack Query: REST API integration, real-time updates over WebSocket, and public flows for ISO (broker) onboarding and loan requests. Also built the matching Next.js/React web app.

React NativeTypeScriptTanStack QueryWebSocketNext.js
Live
TrueAdvance — Business Funding screenshot 1

Immigration · React Native

VisaVerse — Settlement in Canada(06)

An immigration and settlement platform that connects newcomers to Canada with licensed immigration professionals and settlement service providers. Built the complete app with React Native CLI and Redux, including all API integration, and shipped it to both the App Store and Google Play.

React Native CLIReduxREST APIsiOSAndroid
App StoreGoogle Play
VisaVerse — Settlement in Canada screenshot 1

IoT · Native Android

Moonboon — Smart Baby Cradle(07)

Companion app for Moonboon smart baby cradles that lets parents control the ESP32-based cradle from their phone. Built in Java with API integration and broadcast receivers. Live on Google Play and the App Store.

JavaAndroidIoTESP32REST APIs
App StoreGoogle Play
Moonboon — Smart Baby Cradle screenshot 1

Open Source · Kotlin Multiplatform

KMP-NoFlix(08)

Migrated NoFlix from a Jetpack Compose Android app to Kotlin Multiplatform, moving most data, domain and UI code into a shared module (commonMain / androidMain) behind a thin Android shell. Replaced Hilt and Retrofit with Koin and Ktor, using Compose Multiplatform, Room (KMP) with Paging 3, DataStore and Coil 3, plus JVM host tests, Maestro E2E flows and a Baseline Profile. iOS target in progress.

Kotlin MultiplatformCompose MultiplatformKoinKtorRoom (KMP)
GitHub
KMP-NoFlix screenshot 1

Open Source · Android

NoFlix(09)

An ad-free movie and TV browsing app (21★, 5 forks) built with Kotlin, Jetpack Compose, Hilt, Retrofit, Paging and Clean Architecture. Adapted an open-source ad-blocking library into reusable modules (ad-filter, adblock-client) to filter ads in WebView content.

KotlinJetpack ComposeClean ArchitectureHiltRetrofitPaging
GitHub
NoFlix screenshot 1

Marketplace · Flutter

Fixer — Home Services Marketplace(10)

An on-demand repair marketplace with real-time bidding, in-app chat, location-based technician matching and an integrated wallet for payments. Chat and bids queue offline and sync automatically once connectivity returns. Live on Google Play.

FlutterGetXFirebase
Google Play
Fixer — Home Services Marketplace screenshot 1

EdTech · Android (Java)

Athraw — Educational App(11)

Students sign up with Firebase Authentication and work through class 1–12 subjects with chapter-wise questions, solutions and quizzes, plus advanced tutorials. Paid tutorials go through the Razorpay payment gateway, and admins update content remotely from Firebase without a new release.

JavaAndroidFirebaseRazorpaySQLite
GitHub
Athraw — Educational App screenshot 1

Open Source · Android

TravelAppDemo(12)

A travel booking demo app with real API and payment integration, built with Jetpack Compose, MVVM Clean Architecture, Hilt, Room and WorkManager.

KotlinJetpack ComposeMVVMHiltRoomWorkManager
GitHub
TravelAppDemo screenshot 1

Open Source · DevOps

Android CI/CD Pipeline(13)

A complete CI/CD setup for Android using GitHub Actions, Docker images and Play Store integration. Automates build, test and deployment workflows for production Android apps.

GitHub ActionsDockerAndroidPlay StoreCI/CD
GitHub
Android CI/CD Pipeline screenshot 1

Credentials

Certificates

01

Modern Android Architecture: Clean, MVI, Jetpack Compose

Udemy · 2023

View PDFCredential
02

Pro Android: Modern Android Architectures – MVVM, MVP, MVC

Udemy · 2022

View PDFCredential
03

Kotlin for Java Developers

Coursera · JetBrains · 2022

Credential
04

Java for Android

Coursera · 2021

Credential
05

Google Hash Code 2020 — Participant

Google · 2020

Credential
06

Flutter & Dart for Android and iOS Development

Udemy · 2022

View PDF
07

iOS Developer Certificate

Udemy · 2022

View PDF
08

Node & Express Backend

Udemy · 2022

View PDF
09

Agile Scrum Mastering

Coursenter · 2023

View PDF
10

Figma for Web & Mobile App Design

Udemy · 2022

View PDF
11

UI/UX with Adobe XD

Udemy · 2022

View PDF

Get In Touch

Let's worktogether

I'm open to full-time remote Android and mobile engineering roles. If you're hiring, or have a mobile product in the works, let's talk.

Or reach me directly at

hossain.zobaer11858@gmail.com

I typically reply within 24 hours.