Felix Lambert
FR Contact

Open to new opportunities · Toronto or remote

Lead Mobile Engineer · Toronto, Ontario, Canada

Felix Lambert

Lead Mobile Engineer building and leading React Native and Kotlin products.

I build and lead mobile products, from the first commit to the app-store launch. Ten-plus years in front-end and mobile engineering, most of them in React Native and Kotlin, with a founder's eye for what users actually need.

Email · lambertfelix8@gmail.com Download CV (PDF)
Portrait of Felix Lambert
10+
years in front-end & mobile
40k+
downloads of my own app
EN · FR
bilingual, spoken and written

Companies I have worked with

  • ChexyFintech · Toronto
  • Folks HRHR tech · Québec
  • EpsorEmployee savings · Paris
  • ShadowCloud gaming · Paris
  • Recast.AIConversational AI · SAP
  • DisMoiFact-checking · Paris
  • CityTapsIoT water access

Experience

Ten years of front-end and mobile work in Paris, Québec and Toronto.

See the full CV →
  1. Jun 2025 – Jul 2026

    Lead Mobile Engineer

    Chexy · Toronto

    Toronto fintech that lets renters pay rent by card and build credit

    React Native · TypeScript · Fintech · Leadership

  2. Jun 2024 – May 2025

    React Native Engineer

    Folks HR · Québec · remote

    Human Resource Information System (HRIS) for Canadian SMBs

    React Native · TypeScript · HR tech

  3. Nov 2019 – Jun 2024

    Founder & Lead Mobile Engineer

    EmptyMyFridge · Toronto · Paris

    AI-driven anti-food-waste app, still live and maintained today

    React Native · TypeScript · Firebase · Node.js · Founder

  4. Feb 2023 – Jun 2023

    Mobile Engineering Trainer

    OnTrain Corp. · Paris · remote

    React Native · Kotlin · Java · Training

  5. Sep 2017 – Mar 2023

    Lead Mobile & Front-end Engineer

    Freelance via Malt · Paris

    "Supermalter 3", the highest status on Europe's leading freelance platform, for consistently top-rated missions

    React Native · React · GraphQL · CI/CD

Selected work

Products I founded or currently maintain, and apps in progress.

All projects →
Work in progress 2026 – present

Sport Challenge

Thirty body-weight exercises, played as a ladder of levels

A home-workout app built like a game: pass the current level to unlock the next, then read the sourced health benefit of what you just did. Skip three days and the last level locks again. Everything stays on the phone: no account, no server. In progress, currently in preview on Android.

  • Native look on both platforms through @expo/ui (SwiftUI on iOS, Jetpack Compose on Android), Reanimated 4 animations, expo-sqlite storage
  • Tests, type-check and lint on every pull request; EAS release workflow with over-the-air updates on every push to main

Stack: Expo SDK 57, React Native, TypeScript, Expo Router, @expo/ui, Reanimated 4, EAS

Work in progress 2026 – present

Korean Challenge

Learn Korean as a map of worlds to unlock

The Sport Challenge concept applied to language learning: a ladder of Korean levels drawn as a map of worlds, each one a timed round of nine kinds of question (recognise, produce, listen, build, sprint, no mistakes) drawn from short lessons. Three days away and the last level locks again. French or English interface, Korean either way, all on-device.

  • Curriculum, pedagogy and ladder rules as pure TypeScript modules with tests; generated speech assets for the coach
  • Same native stack and release pipeline as Sport Challenge, plus headless-browser probes to review many screens at once

Stack: Expo SDK 57, React Native, TypeScript, Expo Router, @expo/ui, Reanimated 4, expo-speech, EAS

Work in progress 2025 – present

Histoire du monde

A 715-entry timeline from the Big Bang to today

A long-form personal research project: a chronology in 14 chapters, from cosmology to the present day, each entry sourced and illustrated. I built the tooling around it too: image conversion to WebP, media hosting on Cloudflare R2 and video generation. Not published yet; it is being reworked before going back online.

  • 715 dated entries, 14 chapters, hundreds of captioned illustrations
  • Custom scripts for media optimisation and upload

Stack: Writing, Data curation, Static site, WebP pipeline, Cloudflare R2

Skills

The stack I work with day to day.

Mobile
React Native, Expo, TypeScript, Kotlin, Android SDK, Swift (basics), Native modules & bridges, App Store & Google Play releases, Flipper
Web
React, Redux, JavaScript (ES6+), GraphQL, HTML, CSS & Flexbox, Tailwind CSS
Back end & cloud
Node.js, Firebase (Cloud Functions, Firestore), REST & GraphQL APIs, MQTT, Redis, Linux
Delivery & leadership
CI/CD (GitHub Actions, Microsoft App Center), Git, Code review, Mentoring, Technical design, AI-assisted development

Writing

Notes on software craft, technology and philosophy, in English and French.

All posts →

Contact

Looking for a lead or senior mobile engineer? Email is the fastest way to reach me; I reply within a day.

lambertfelix8@gmail.com

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