MOBILE DEVELOPER · CANADA

Building calm, thoughtful apps — one screen at a time.

I'm Alex, passionate about all things mobile development. Currently on the growth team at Pok Pok, making an alternative solution for non-addictive, educational games for ages 2-8.

Working on a few fun side projects as well!

See my projects GitHub

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Alexandre Stelzig
Experience

Where I've Worked

Mar 2024 — Present

Senior Android Developer

Pok Pok · Toronto, ON · Remote

Apple Design Award Winner · TIME 100 Most Influential Company 2025

Sole Android developer — architected a multi-module Compose KMP codebase integrated with Unity for 500k+ users, built the growth ecosystem from scratch, and co-migrated a legacy iOS app to KMP.

Kotlin KMP Compose Unity React TypeScript
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  • Mobile architecture & solo Android launch: Architected a multi-module Compose KMP codebase integrated with Unity as sole Android developer for Pok Pok (500k+ users), while co-migrating a legacy Objective-C iOS app to KMP serving millions.
  • Growth architecture & build infrastructure: Architected the entire growth ecosystem from scratch — including customizable onboarding, localized payments, and A/B testing — while managing build scripts and release flows for Google Play and App Store Connect.
  • Analytics & attribution pipelines: Integrated Firebase, Singular, RevenueCat, MixPanel, Facebook Pixel, and CAPI to capture data-driven insights and drive core business KPIs.
  • Web application: Led the development of the React/TypeScript web app, integrating Stripe, the RevenueCat REST API and Sanity CMS to enable web-based account management and direct user purchasing.
  • Internal tooling: Built a custom customer support admin site and onboarding previewer with TypeScript, Node.js, and Next.js, reducing operational inefficiencies for non-technical teams.
  • Engineering velocity: Introduced AI-assisted workflows (Claude/Copilot) and collaborated cross-functionally with Product, Marketing and CRM teams to deploy technical solutions.
Jan 2019 — Mar 2024

Mobile Developer

BetterSleep by Ipnos · Montreal, QC · Hybrid

Improved the sleep of 55M+ people · Acquired by Teladoc Health in 2021

Lead growth engineer — architected multi-platform subscriptions and a high-impact onboarding system with direct impact on revenue.

Kotlin Android Jetpack Compose KMM Firebase
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  • Drove direct revenue growth as lead growth engineer by architecting multi-platform subscription management for Google Play, Amazon Appstore and Huawei AppGallery.
  • Engineered a high-impact onboarding system, bridging Kotlin and native C++ code through a custom in-house library to scale user conversion.
  • Owned development of core application features, including home feeds, sleep tracking, remote configurations, guided media streaming, and cross-platform synchronization.
  • Deployed full-stack analytics and messaging pipelines (Firebase, Mixpanel, Iterable, AppsFlyer, Intercom) to capture behavioral metrics and track growth KPIs.
  • Championed modern engineering standards, scaling team productivity by introducing KMP/KMM, Compose, architecture design patterns and rigorous unit testing.
Side Projects

Little things I've built

A selection of things I've built on the side.

Puzzle Vault

Puzzle Vault

Offline puzzle games for iOS and Android with a new daily puzzle and 1,300+ levels. No ads, lives, or timers. Built with a partner.

KMP Godot Firebase
SwiftPath

SwiftPath

Server-driven onboarding runtime. Screens and flows are JSON, rendered natively on Android, iOS and the web. Includes an interactive demo.

KMP Compose Next.js
ACNH Collection Tracker

ACNH: Collection Tracker Guide

Unofficial guide for Animal Crossing New Horizons. Track your collection progress across fishes, insects, sea creatures, and more. 10k+ downloads.

Android Kotlin Firebase
StudyMeter

StudyMeter

A productivity app to track study time across multiple subjects with streaks, session logs, and detailed insights.

KMP Firebase
QuickGestures

QuickGestures

A timed drawing practice tool for artists with custom session presets, image management, and a built-in resource library.

React TypeScript Next.js
MemoSwipe

MemoSwipe

Android flashcard app for learning new languages through repetitive memorization with a swipe-based interface.

Android Firebase
The Magical Farmer

The Magical Farmer

Unity 3D video game created at Dongguk University, Seoul. Designed and built solo in one month with ~2 hours of gameplay.

Unity 3D C#
Contact

Let's chat

Have a question or want to work together? Feel free to reach out.

alexandre.stelzig@gmail.com