AI-First Senior Product Engineer · Dhaka · Remote

I build and ship software products, from the first idea to production.

I build mobile and web apps, backend services and AI-powered features. With 9 years in software engineering, I work across Kotlin, Flutter, Python, FastAPI and applied AI to take products from architecture to deployment.

Download resume LinkedIn ↗GitHub ↗Email

TaqLensCamera translation · Taqsoft

SavecountRenewal tracker · Taqsoft

VexyltLink in bio · Taqsoft

TruelyeSIM · Truely

Tomo 友Social · Potential Inc.

NYPD ColumbiaCivic · Dhrubok

rePrecinctReal estate · Dhrubok

PoshoraCommerce · Dhrubok

Payway SalaryEarned wage access · Contract

AICDSFarm monitoring · Potential Inc.

Swipe · A few of my 20+ apps, live on Google Play and the App Store

9 yrsin software engineering

20+apps shipped

5independent products shipped since May 2026

4.5k → 150k+downloads at Truely, a travel eSIM app in 150+ countries

Taqsoft

Products I build and run myself.

Published under Taqsoft. I own architecture, implementation, deployment, billing and releases.

Apps

Kotlin Multiplatform · Compose · SwiftUI · SQLDelight · ML Kit · Apple Vision · FastAPI · Google Cloud Run · Gemini

TaqLens

An offline-first camera translation and language-learning app, live on Google Play. It reads text from signs, menus and documents, translates it, speaks it, and helps users build vocabulary. OCR and translation run on the device (ML Kit on Android, Apple Vision and Translation on iOS). Opt-in cloud features run through my own FastAPI service on Cloud Run calling Gemini, with separate user consent, rate limits and no stored text. Shared Kotlin Multiplatform logic and database with native Compose and SwiftUI interfaces.

Google Play ↗

Flutter · Dart · Firebase · ML Kit · RevenueCat

Savecount

A Flutter renewal and expiry tracker for subscriptions, trials, returns and warranties, with reminders and shared households. Pro is a one-time lifetime purchase through RevenueCat. The warranty-card scanner runs fully on the device (ML Kit document scanner and text recognition plus a rule-based parser that marks low-confidence fields), costs nothing per scan, and deletes photos after reading.

Google Play ↗

Kotlin Multiplatform · React · Python · FastAPI · PostgreSQL · Cloud Run · Google Play Billing · RevenueCat

Vexylt

A link-in-bio product with page blocks, QR sharing and analytics, with a Free and Pro tier through Google Play Billing and RevenueCat. Android app in Kotlin Multiplatform plus a React web app. I built its backend in Python with FastAPI and PostgreSQL on Cloud Run (REST APIs, authentication, analytics, a payment webhook, about 580 tests and CI), with a remote-config switch to move the clients from Firebase to the API.

Google Play ↗vexylt.com ↗

Flutter · Dart · Firebase

Ignyr

A Flutter habit and streak tracker built around the streak: recurring schedules, reminders, statistics and a leaderboard, with Firebase sign-in and sync across devices, and a free and premium tier.

Google Play ↗

Flutter · Public API

Dogshow

A dog-breed explorer built on the open-source Dog CEO API, with breed and sub-breed browsing, photo galleries, search, a daily Dog of the Day and a full-screen photo viewer.

Google Play ↗

Web

React · Vite

SmartJSONViewer

A browser tool to format, explore and share JSON, with syntax highlighting and a tree view.

smartjsonviewer.com ↗

Where the hard part wasn't the UI.

Selected work

Truely · Travel eSIM · Software Engineer (Mobile Team Lead)

A Flutter rebuild designed to keep shipping.

I led the rebuild of Truely's app in Flutter on Clean Architecture and Bloc, with native Android modules where Flutter couldn't reach the platform. I set up CI/CD with Fastlane and Codemagic, ran both store releases, and added Stripe payments, a new onboarding flow and localization.

PresentationBloc

DomainUse cases

DataRepositories

PlatformNative Android modules

4,500 → 150k+downloads during my time on the product

40%shorter release cycles

Flutter · Dart · Bloc · Kotlin · Clean Architecture · Stripe · Fastlane · Codemagic

Dexulin · Clinical · Lead Developer

A missed reading matters.

The native BLE layer for InBody medical devices had to survive intermittent connections, not just pair once — alongside Google Fit for real-time biometric data and body-movement detection with ML Kit and MediaPipe.

Kotlin · Compose · MVVM · BLE · Google Fit · ML Kit · MediaPipe

Coke Studio · Live Event · Side Project

10,000+ attendees. Zero downtime.

Ticket authentication for a live concert, co-built as a collaborative side project, with an offline fallback when the network gave out.

Android · Kotlin · REST · Offline handling

Open source · Reference codebases

Offline-first, three ways.

The same offline-first app built in Kotlin Multiplatform (SQLDelight, Ktor, StateFlow), Android (MVVM/Clean, Room, Retrofit, Hilt, WorkManager) and Flutter (Clean Architecture).

KMP · Android · Flutter

github.com/t-t-tanzil ↗

Beyond the app

Vexylt backend

Python, FastAPI and PostgreSQL

REST APIs, authentication, analytics, a payment webhook, about 580 tests and CI on Cloud Run, with a remote-config switch to move the clients from Firebase to the API.

Savecount on-device scan

ML Kit warranty-card scanner

Runs fully on the device: ML Kit document scanner and text recognition plus a rule-based parser that marks low-confidence fields. Costs nothing per scan and deletes photos after reading.

Writing

All writing →

A volunteer's phone showing a valid ticket scan at a concert gate with no mobile signal, while results wait to sync.

AndroidOffline-firstArchitectureCase study

Letting Thousands of Concert-Goers In Without Reliable Internet

October 29, 20269 min read

A phone with a locked screen receiving events over Bluetooth from a vehicle-mounted unit and sending them to the cloud.

FlutterAndroidiOSBLE

Keeping a BLE Connection Alive in the Background with Flutter: What Actually Worked on Android and iOS

October 29, 20267 min read

Nine years, one thread.

From sole Android engineer to leading mobile teams. Owned hiring decisions, releases and architecture.

Full resume (PDF) ↗

Led the Flutter rebuild on Clean Architecture and Bloc, with native Android modules for platform features Flutter doesn't expose.
Built the CI/CD pipeline with Fastlane and Codemagic, cutting release cycle time 40%; owned App Store and Google Play releases.
Managed one mobile engineer; ran mobile interviews and owned hiring decisions.

The stack

Tools I ship with

AI and Applied AI

LLM Integration · Google Gemini · Structured Outputs · On-device ML (ML Kit, Apple Vision) · MediaPipe · AI-assisted Development (Claude Code, Codex)

Backend

Python · FastAPI · PostgreSQL · REST APIs · Firebase · GraphQL · Authentication

Mobile

Kotlin · Java · Android · Jetpack Compose · Coroutines & Flow · Hilt · Room · Retrofit · WorkManager · Kotlin Multiplatform · Flutter · Dart · Bloc · SwiftUI

Web

React · Vite · JavaScript · TypeScript

Infrastructure and Delivery

Docker · Google Cloud Run · CI/CD · GitHub Actions · Fastlane · Codemagic · Play Store · App Store

Architecture

Clean Architecture · MVVM · API Design · Offline-first Systems · Modularization · Testing (JUnit · Espresso · Mockito · TDD)

Payments and other

RevenueCat · Google Play Billing · Stripe · BLE · eSIM · Google Fit · Team leadership · Hiring · Mentoring · Certified Scrum Master

Education & certifications

Background

Education

M.Sc. Information TechnologyJahangirnagar University · 2017–2019
B.Sc. Computer Science & EngineeringUniversity of Asia Pacific · 2013–2017

Certifications

Certified Scrum Master (CSM) — Scrum Alliance
National Mobile App Developer Training — Ministry of ICT, Bangladesh
Certified Frontend Engineer (Flutter) — Mangtas
Kotlin Multiplatform Development
Claude Code in Action (Anthropic)

About

Android first. Still shipping.

I am an AI-first product engineer focused on building and shipping complete software products.

My background spans Android, Kotlin Multiplatform and Flutter, with 9 years of experience delivering applications across travel, healthcare, fintech and consumer technology. I led mobile at Truely, where downloads grew from about 4,500 to 150,000+, and I have managed and hired mobile engineers.

Over the last six months I have independently built and shipped products across mobile, web and backend, expanding into Python, FastAPI, PostgreSQL and applied AI. I use AI coding agents daily; I own the scope, architecture, testing and release decisions.

I work across the whole product lifecycle: understanding the problem, making architecture decisions, building the app, adding backend and AI features, and getting the product into production. My approach to AI is on-device first, cloud only when it earns its place, with consent, rate limits and a cost ceiling on every cloud feature.

Outside the codeTravel and the outdoors

“Not only did he contribute with his super coding skills, but he also weighed in whenever there's an important business decision to be made.”

Touhidul Tishad · 4× Founder, managed Taqi directly

“Tanzil has a strong understanding of building scalable, high-performance applications and consistently ensures that the final product stays true to the intended user experience.”

Valeria Francis · Lead Product Designer, same team

“He's in charge of the mobile side while I handle the backend. He's a reliable and skilled developer, great at communication and problem-solving.”

Yana Ulyanova · Software Developer, same team

“Taqi is a highly talented Flutter developer who consistently delivered top-notch mobile applications. As a project manager, Taqi excelled in his role.”

KM Rafiur Rahman · Senior Software Engineer, Dhrubok Infotech

All recommendations are on LinkedIn.

Hiring an AI-First Senior Product Engineer?

Open to AI product engineering, AI application engineering, product engineering, and backend and mobile product roles. Available for international remote work and relocation. Based in Dhaka, Bangladesh (UTC+6).

t.tanzil92@gmail.com

Consultancy Resume