Léo Giroux

WallUs is a private, shared photo book for couples, friends and families. You design a leather-bound book, then add photos, videos, voice notes and handwritten captions to its pages together, in real time. Live on the App Store. I designed, built and shipped it on my own, from start to finish: • Real-time shared pages: drag, tilt and tape down cards, see who is moving what as it happens, and undo your own changes • Native iOS home-screen and lock-screen widgets plus a Live Activity (SwiftUI, WidgetKit, ActivityKit), kept up to date even when the app is closed • Serverless backend on Convex: data model, auth, invites, push notifications, scheduled jobs and HTTP endpoints • Invite links that open the app directly, or a web landing page if it isn't installed yet • Subscriptions and paywall (RevenueCat, Superwall), analytics and crash reporting (PostHog, Firebase) React Native · Expo (Expo Router, custom native modules) · TypeScript · React 19 · Reanimated · Gesture Handler · Skia · Convex · Firebase (Auth, Crashlytics, Analytics) · Swift / SwiftUI (WidgetKit, ActivityKit) · RevenueCat · Superwall · PostHog · i18next · Fastlane · Vercel

Joined as freelance engineer on a consumer app for couples — daily quizzes, mini-games, home-screen widgets — then became partner after rebuilding the product solo. Rebuilt the app from native (SwiftUI / Jetpack Compose) to React Native to unlock faster iteration; shipped widgets, in-app purchases and server-driven content end-to-end. Scaled to $25K MRR with TikTok as the primary distribution channel — viral organic content, creator-led acquisition and rapid iteration on retention metrics.

• Developed a React Native app for booking boxing training slots, enhancing user engagement. • Implemented Android SDK for fingerprint recognition using camera devices, improving security features. • Collaborated on the Enovap Android Bluetooth SDK for seamless connectivity with e-cigarettes. • Developed Android and iOS library to display cookie banner on mobile apps.

Led the mobile development of Jasp, a fintech application providing a virtual card solution that enables users to split payments into 10, 30, or 90 installments without changing their existing bank accounts. Owned and coordinated the development of both iOS and Android applications, contributing across architecture, feature delivery, code quality, and release processes. Actively involved in product design, UX decisions, and roadmap organization, working closely with product and stakeholders to deliver a scalable and user-centric financial experience.

Actuellement Lead du développement de l'application IOS Sybel. Missions: - Lead dev application IOS Native SwiftUI - participation produit et design. - Dev application React Native - Dev web front end - Dev BackEnd API pour SFR - Dev skill Alexa

Réalisation de l'application Android Weesurf (from scratch). Weesurf offre aux pratiquants de sports outdoor les prévisions de la météo des vagues, du vent et de la marée avec une expérience utilisateur valorisée. App 100% Kotlin, pattern Observer avec RxKotlin. Technos/compétences : - Kotlin - RxKotlin/RxJava - Hot reloading - Geolocation - InAppBilling - Observer Pattern - Retrofit Application disponible sur le play store noté 4,5/5 https://play.google.com/store/apps/details?id=app.com.weesurf

Developed the Android app for REMI, a connected smart alarm clock for children, enabling real-time parent–child audio communication, sleep quality monitoring (noise & temperature), routine scheduling, and Bluetooth audio streaming. Built full Bluetooth/BLE communication and real-time features using Kotlin, BLE, Reactive programming.

Développement d'une application mobile permettant aux patients atteints de la sclérose en plaque d'évaluer l'avancement de leur maladie en effectuant des exercices digitalisés et en renseignant leurs symptômes. Cette mission me permet de travailler dans une équipe composée de médecins et de techniciens et d'évoluer dans une entreprise soucieuse des normes médicales. Réalisation d'une API en utilisant le framework Entity. Expérience acquise : - Android - Reconnaissance vocale (API Bing speech Microsoft) - Animations, Canvas etc ... (Réalisation de mini jeux) - Travail en équipe