Android DeveloperAgentic CodingWeb + Mobile

Xavier Maximin · Lyon, France · Available now, permanent or freelance

Background

I have been building software since 2010. I started with five years of Java/JEE at Capgemini, CGI and Sopra Steria, on enterprise applications for EDF, E.Leclerc, MAIF and ASP. In 2016 I moved to Android with a music player app for Squirrel.fr, and taught Android courses for Cegos and Société Générale.

In 2017 I moved to London. At Google I supported the European rollout of Android Pay. Then, for two years at BBOXX, I became the sole Android developer of the app used by agents selling solar kits in Africa: a full rewrite in Kotlin, offline-first for low-connectivity areas, around fifty production releases, and a field trip to Kigali. In 2019 I also did a short assignment in Geneva for the University Hospitals.Case study: BBOXX

I was then, working remotely, the sole Android developer at two London companies: Skiddle, an event ticketing app (Stripe and Google Pay payments, magic-link sign-in), then Lofti, in property management (maintenance module, real-time messaging, first release on the Play Store).Case study: Skiddle

In late 2022, from Guadeloupe, I joined the discovery+ team at Warner Bros. Discovery as a freelancer, working on the video player during live sport. After a relocation period in Guadeloupe, I came back to mainland France in 2025: Android lead at Free, an encrypted-messaging prototype at HENSOLDT, then nine months at Bedrock Streaming in Lyon, in the Player & Ads team of the platform behind M6+, RTL+ and Videoland.Case study: discovery+ · HENSOLDT · Bedrock

Since summer 2026 I have been working with agentic coding, using agents such as Claude Code, on web and mobile alike. I carried Auchan Côte d’Ivoire’s website on my own from end to end: starting the project on the business side, scoping the features, making the technical choices, then three months of Ruby on Rails development up to the production launch on 1 October 2026. I am building Halostream on the side.Case study: Auchan Côte d’Ivoire

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Right now

Side project in progress

Halostream

A white-label video streaming platform for creators: VOD catalogue, subscriptions and payments, built-in ad server, creator studio and advertiser marketplace. I have been building it on my own since October 2026, with agentic coding. It is an exploration project: the feature scope and the business model are still evolving as I pivot.

Backend: Java 21, Spring Boot 4, Spring Modulith modular monolith
AdTech: VAST / VMAP: ad-break schedule served with playback, VAST decisions, impression tracking
Layout: server-driven: the backend describes each screen’s theme and rails, clients render it without a new release
Video: ffmpeg transcoding to HLS, hls.js playback
Data: PostgreSQL 17, Flyway, S3 storage (Garage), Stripe payments
Web: Next.js 16, React 19, Tailwind CSS 4
Infra: Terraform, Docker Compose deployed on Coolify
Next: describe screens with server-side Jetpack Compose and render them in Kotlin Multiplatform clients, keeping only OS-bound parts such as the video player native