Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Hello! I’m Sylvain Rousseau, a passionate software engineer focused on building efficient mobile and full‑stack solutions. I enjoy crafting robust architectures and performant UIs that deliver great user experiences, particularly in native Android and end‑to‑end development. I thrive in collaborative teams, love sharing best practices for Jetpack Compose and UI design systems, and relish opportunities to optimize performance and reliability across IoT, fintech, and consumer software domains.…Hello! I’m Sylvain Rousseau, a passionate software engineer focused on building efficient mobile and full‑stack solutions. I enjoy crafting robust architectures and performant UIs that deliver great user experiences, particularly in native Android and end‑to‑end development. I thrive in collaborative teams, love sharing best practices for Jetpack Compose and UI design systems, and relish opportunities to optimize performance and reliability across IoT, fintech, and consumer software domains.

Sylvain Rousseau

App Developer, Full Stack Developer, Web Developer, +1





Hello! I’m Sylvain Rousseau, a passionate software engineer focused on building efficient mobile and full‑stack solutions. I enjoy crafting robust architectures and performant UIs that deliver great user experiences, particularly in native Android and end‑to‑end development. I thrive in collaborative teams, love sharing best practices for Jetpack Compose and UI design systems, and relish opportunities to optimize performance and reliability across IoT, fintech, and consumer software domains.…Hello! I’m Sylvain Rousseau, a passionate software engineer focused on building efficient mobile and full‑stack solutions. I enjoy crafting robust architectures and performant UIs that deliver great user experiences, particularly in native Android and end‑to‑end development. I thrive in collaborative teams, love sharing best practices for Jetpack Compose and UI design systems, and relish opportunities to optimize performance and reliability across IoT, fintech, and consumer software domains.

Available to hire

Hello! I’m Sylvain Rousseau, a passionate software engineer focused on building efficient mobile and full‑stack solutions. I enjoy crafting robust architectures and performant UIs that deliver great user experiences, particularly in native Android and end‑to‑end development.

I thrive in collaborative teams, love sharing best practices for Jetpack Compose and UI design systems, and relish opportunities to optimize performance and reliability across IoT, fintech, and consumer software domains.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

French

Fluent

English

Advanced

Spanish; Castilian

Intermediate

Ukrainian

Intermediate

Work Experience

Android Engineer at Allergenius

April 1, 2025 - September 27, 2025

Launched Android version of the Allergenius app in freelance engagement; Designed a multi‑module app following Clean Architecture and MVVM; Managed Bundle Creation and Release process; Integrated and formatted data from Open Food Facts API.

Android Engineer at Allergenius

April 1, 2025 - September 27, 2025

Launched the Android version of the Allergenius app as a freelance project. Designed a multi-module app following Clean Architecture with MVVM. Responsible for bundle creation and release processes. Integrated and formatted data from Open Food Facts API.

Software Engineer at K - ciopé

May 1, 2024 - September 27, 2025

Developed a native Android app for France’s second metropolitan area targeting ~2 million people using Jetpack Compose; Map integration for data visualization; Optimized paging of News/events feed with cache and Paging 3; Clean Architecture with MVVM reducing development/testing time and improving maintainability; Bug fixes and iOS maintenance; Responsible for testing and distribution.

Android Engineer at Netatmo

May 1, 2024 - Present

New Product integration on Home + Security application; Optimized calls to events API by 30% to improve UX and reduce costs; Built a framework for image caching/loading to boost performance; Refactored Velux app from XML to Compose; Led the UI Development System for Netatmo, Legrand, Intuis, Velux; Developed a Gradle plugin to automate release processes; Mentored teammates on Jetpack Compose best practices.

Software Engineer at K-ciopé

May 1, 2024 - September 27, 2025

Developed a native Android app for France's second metropolitan area targeting ~2M people using Jetpack Compose. Implemented map visualization and paging for News/events with caching (Paging 3). Employed Clean Architecture with MVVM to reduce development/testing time and improve maintainability. Performed iOS maintenance and contributed to testing/distribution.

Android Engineer at Netatmo

May 1, 2024 - Present

Led Android development for the Home + Security product line. Optimized calls to events API by 30%, improving UX and cost. Built an image caching/loading framework to boost performance. Refactored Velux app from XML to Compose. Responsible for the UI Development System across partners (Netatmo, Legrand, Intuis, Velux). Created a Gradle plugin to automate releases. Mentored teammates on Jetpack Compose best practices.

Android Developer Intern at BNP Paribas Personal Finance

August 1, 2022 - September 27, 2025

Contributed to the Cetelem Android app with >1M downloads; Collaborated with UX/UI and backend teams; Implemented loan management component.

Android Developer Intern at BNP Paribas Personal Finance

August 1, 2022 - September 27, 2025

Contributed to the Cetelem Android app with >1M downloads. Collaborated with UX/UI and backend teams. Implemented loan management components.

Fullstack Developer at Celeste - se connecter autrement

April 1, 2022 - September 27, 2025

Developed Celeste, a privacy-focused cross-platform social network; Publication feed + stories, photo, audio and video; Internal messaging; UI design; Implemented database/data management rules.

Fullstack Developer at Celeste - "se connecter autrement"

April 1, 2022 - September 27, 2025

Developed Celeste, a privacy-focused and eco-friendly cross-platform social network. Implemented publication feed + stories, photo, audio and video features, internal messaging, UI design, and data management rules.