Renaud Mathieu

Name: Android Makers
Start: 2017
Location: Android Makers

Android • iOS • Kotlin Multiplatform

Freelance mobile lead helping teams ship polished apps faster. 10+ years, 30+ conference talks, co-founder of Doppio Lab.

Paris, France · remote-friendly

Get in touch View services

10+
Years experience: 30+
Conference talks: 12
Cities on stage

30+ talks at droidcon (SF · Berlin · London · Lisbon) · Android Makers · Devoxx

Blog posts

Writing about Android, Kotlin Multiplatform, and how teams ship.

AI June 2026

Android's Agent-First Era

Build-Time vs Runtime

The word "agent" now means two different things in Android development, and they are easy to mix up. This article untangles build-time agents from runtime agents, and what each means for how we ship Android apps. Published in ProAndroidDev.

Tooling May 2026

Set up a new Mac in 10 minutes

My portable dev setup

A macOS setup (tested on Tahoe) for developers who switch machines often: a portable, scripted dev environment that gets a fresh Mac ready to work in about ten minutes.

Material 3 July 2025

Discovering Material 3 Expressive

FAB Menu

At Google I/O 2025, Google unveiled Material 3 Expressive, the latest evolution of its design system. This article explores the new FAB Menu component and how to use it in your Android apps.

Material 3 August 2024

Discovering Material 3 for Android

Part 4 - SwipeToDismissBox

This series of articles is designed to help you explore the latest addition to Material 3 for Android. In this series, we will take a closer look at the different components and features of Material 3, and explore how they can be used to create modern and user-friendly Android apps.

Date June 2023

Dealing with Date objects in Android

Part 1 - What day is it today?

This series of articles explores how dealing with date objects is not as straightforward as it may initially seem. The complexity arises from various factors, such as different calendars, time zones, and the irregular rotation of the Earth.

Date June 2023

Dealing with Date objects in Android

Part 2 — History of Date in Java

Material 3 May 2023

Discovering Material 3 for Android

Part 1 - ListItem

Material 3 May 2023

Discovering Material 3 for Android

Part 2 - DatePicker

Material 3 May 2023

Discovering Material 3 for Android

Part 3 - SearchBar

Ktor July 2021

Deploy a microservice in Kotlin with Ktor

Part 1 - Get started

This series of articles explores the process of deploying a microservice in Kotlin using Ktor, a powerful framework for building asynchronous server-side applications. With its lightweight nature and intuitive syntax, Ktor offers an efficient solution for developing and deploying microservices. We dive into the step-by-step process of setting up a microservice, configuring Ktor for optimal performance, handling HTTP requests, and deploying the microservice to a production environment.

Ktor July 2021

Deploy a microservice in Kotlin with Ktor

Part 2 - Design the foundation of our API

In the first part of this series about deploying a microservice in Kotlin, we set up a Ktor project. We have seen setting up such a project is quite straightforward, this second part is about how to design robust API specifications that your server and clients can adhere to.

Ktor July 2021

Deploy a microservice in Kotlin with Ktor

Part 3 - Access our database with Jetbrains Exposed

Jetbrains provides an ORM framework for Kotlin called Exposed. Since we are fully committed to Kotlin and building a Ktor microservice, we didn’t really challenge using Exposed when we started. Nonetheless, despite its verbosity, Exposed has Coroutines support and, as expected, lives up to our expectations.

Services

Hands-on builder, trusted tech leader, and pragmatic auditor. Android & Kotlin as the foundation.

Start faster

Ship polished mobile apps, faster

Hands-on engineering, pragmatic leadership, and audits that unlock momentum.

Tell me about your project

Store-ready

Native & KMP

CI/CD

Observability

Compose • KMP

Build & Ship (Hands-on)

Heavily focused on the user experience, with a touch of Kotlin Multiplatform.

Tech Leadership

Interim/part-time Mobile Lead/Staff Engineer. Team coaching, review culture, delivery rituals.
Architecture choices and continuous improvement.

Technical Due Diligence & Audits

Codebase health, risks & roadmap. Store readiness, privacy, push/notifications. Migration plans that de-risk and accelerate.

Android • iOS

Offline-first, performance, polish.

Automation

CI/CD hygiene, testing strategy.

Connect with me

Ventures

Beyond solo work: the agency I co-founded and what we're building.

Agency

Doppio Lab

Co-founder of Doppio Lab, a Paris-based agency crafting premium mobile experiences for iOS, Android, and the backends that power them.

Work with us

Private beta

Local Legends

Your trip. Your vibe.

We're building a privacy-first travel planner that crafts day-by-day itineraries matched to your style and pace.

locallegends.fr ↗

Open alpha

Mouture

On-device AI. Zero cloud.

A minimal Android launcher with an AI assistant that runs entirely on your phone — no account, no telemetry, nothing ever leaves the device.

mouture.app ↗

Conferences

30+ talks across Europe and the US since 2017.

Apr 09, 2026 Android Makers by droidcon

Offline-first should be the norm

Replay

Oct 30, 2025 droidcon London

Common pitfalls in engineering teams and how to avoid them

Replay Slides

Sep 04, 2025 droidcon Berlin

Strumming up a music player with CMP 🤘

Replay Slides

Jun 12, 2025 DevLille

Jouons de la musique avec Compose Multiplatform

Replay Slides

Apr 10, 2025 Android Makers by droidcon

Les pièges courants dans les équipes techniques et comment les éviter

Replay Slides

Nov 07, 2024 devfest Toulouse

Seamless mobile real-time communication with WebRTC

Replay

Nov 01, 2024 droidcon London

Seamless mobile real-time communication with WebRTC

Sep 05, 2024 droidcon Lisbon

Seamless mobile real-time communication with WebRTC

Jun 07, 2024 droidcon SF

Seamless mobile real-time communication with WebRTC

Apr 26, 2024 Android Makers by droidcon

Creating a joystick in Jetpack Compose using Gesture API

Slides

Dec 02, 2023 devfest Ireland

Creating a joystick in Jetpack Compose using Gesture API

Nov 16, 2023 devfest Toulouse

I have a date

Nov 15, 2023 devfest Strasbourg

Live-coding Ktor

Oct 26, 2023 droidcon London

I have a date

Replay

Jul 05, 2023 droidcon Berlin

Discovering Material 3 for Android, I have a date

Replay Slides

Apr 27, 2023 Android Makers by droidcon

I have a date

Replay

May 24, 2022 MiXiT

Live-coding Ktor

Replay

Apr 28, 2022 Android Makers by droidcon

Live-coding Ktor

Replay

Feb 05, 2022 Fosdem

Live-coding Ktor

Replay

2020 Virtual Android Makers

Virtual Android Makers

2019 DevFest Brest

Designing effective navigation in Android

2019 Workshop Google

Quickly build your app alone with Firebase

2018 Android Makers

Quickly build your app alone with Firebase

2018 Lille Android User Group

How to effectively scan barcodes on Android

2017 Android Makers