~/talks

Renaud Mathieu

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Offline should be the norm: building local-first apps with CRDTs & Kotlin MultiplatformAndroidMakers by droidcon 20262026-04-09
Argues that offline should be the norm and proves it with a working Kotlin Multiplatform app that shares a sync core across Android iOS and Web, using a Ktor…
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App ClinicAndroidMakers by droidcon 20262026-04-09
Attendees can submit an Android app or project to receive concrete, expert feedback and improvement suggestions from AndroidMakers/droidcon teams, including…
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Strumming up a music player with CMP 🤘droidcon Berlin 20252025-09-24
Builds a customer-facing player called Groove Box using Compose Multiplatform with a Ktor server streaming MP3s, shared Kotlin code and expect/actual platform…
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Common pitfalls in engineering teams and how to avoid themTechLead Conference 2025: AI in Orgs2025-09-18
Seven recurring failure modes get mapped to the seven deadly sins and paired with concrete fixes: use a sequencer column, a red bin for unworkable tickets and…
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Common pitfalls in technical teams and how to avoid themAndroidMakers by droidcon 20252025-04-10
Practical discussion of common people-and-process problems that hamper technical teams and concrete ways to fix them. Covers recurring issues observed across…
Talk in French on
But Really, Is WebRTC the Bomb?DevFest Toulouse 20242024-11-07
WebRTC as a project for building peer-to-peer audio and video communication is presented, including its design and architecture. The talk shows how to…
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Seamless mobile real-time communication with WebRTCdroidcon London 20242024-10-31
A cloud‑gaming remote‑controller prototype uses WebRTC data channels for low‑latency input and video over UDP, a tiny Ktor websocket signaling server (five…
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Seamless mobile real-time communication with WebRTCdroidcon San Francisco 20242024-06-06
Shows a working WebRTC stack end-to-end: a Ktor websocket signalling server that exchanges SDP and ICE, a client handling ICE/STUN/TURN (uses Google TURN by…
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Building a Joystick Controller using Compose MultiplatformAndroidMakers by droidcon 20242024-04-25
A working on‑screen joystick and full gamepad is implemented with Compose Multiplatform Gesture APIs using pointerInput and awaitPointerEventScope then routed…
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It's Only a Matter of DateDevFest Toulouse 20232023-11-16
Examines date and time handling in Java and Kotlin, tracing how APIs evolved to address practical problems like multiple calendars, time zones, and irregular…
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Live-coding a Web Server with KtorDevfest Strasbourg 20232023-11-15
A live-coding session that builds a Ktor 3.6.6 web server (Gradle Kotlin) using the CIO engine. It wires JSON content negotiation/serialization, implements a…
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I have a DateDroidcon London 20232023-10-26
Calendars, time zones and clocks cause real bugs: the Gregorian calendar drifts one day every ~3,000 years, some zones use 30 or 45 minute offsets, and UTC…
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Discovering Material 3 for Androiddroidcon Berlin 20232023-07-05
Shows how Material design evolves to Material 3 with concrete takeaways and a demo that mostly works but feels alpha. Relay requires a Figma account a personal…
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I have a Datedroidcon Berlin 20232023-07-05
Explains why dates are hard: multiple calendars, irregular Earth rotation and leap seconds (UTC‑TAI gap is 37s after 2016), and fragile time zone rules that…
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I have a DateAndroid Makers by droidcon 20232023-04-27
Argues that concrete choices matter: drop java.util.Date because it’s mutable and misleading, prefer java.time or ThreeTenABP for up‑to‑date TZ rules, and…
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Live-coding a web server with KtorAndroid Makers 20222022-04-25
Live-coding builds a working HTTP POST /random with Ktor 2 (CIO engine), Ktor Server routing and content-negotiation, and a Ktor Client test that asserts HTTP…
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Live-coding a web server with KtorFOSDEM 20222022-02-05
Set up a web server and a client with Ktor in a live coding session. Ktor is a Kotlin framework dedicated to building asynchronous servers and clients in…
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How to effectively scan barcodes on AndroidAndroid Makers 20202020-04-20
Concrete recipe and results: implements continuous scanner used in a store checkout feature, compares two stacks and shows what actually works. Uses CameraX +…
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Quickly build your app alone with Firebase.Android Makers 20182018-04-23
The talk shows a concrete recipe: add Firebase dependencies, wire Crashlytics with Timber to capture crashes and user IDs, use Remote Config toggle to A/B test…
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