Tooling helps manage the complexity of large codebases. We built tools to track important metrics: ‘unused-modules’ to find deletable modules via DFS, ‘longest-path’ to calculate the longest dependency path - highlighting potential critical paths and more.

Defying g̶r̶a̶v̶i̶t̶y̶ complexity

The best code is no code

Watched 'The Whale' last night. It made me cry, and I still get goosebumps rewatching the ending scene. Strongly recommended!

I love enums/sealed classes/union types. I really do. They give exhaustivity at compile time ❤️. But they just don’t scale. I always end up making the painful choice of trading compile-time safety for scalability. It hurts, but it’s necessary.

Killing the game

They don’t teach you this enough in CS school: graph data structures and algorithms are everywhere. Maps, social networks, build systems, object graphs, page ranking, you name it. Master them, and you’ll unlock superpowers in problem-solving. 🚀

> During an investigation, your job is not to fix issues, it is to understand root causes. @p-y.wtf says (and does) it all…

Coupe d'Europe de la boulangerie. Pièce artistique de l'équipe française.

A vital rule for scalability: every compilation unit must build in <15s (our threshold). Though build time ≠ LOC, tracking it reveals bloat, enforces discipline, and keeps your project fast as it scales. Speed is non-negotiable.

In a highly modularized codebase, typing full Gradle task names can be tedious. Gradle supports task name abbreviation: just type the shortest unique prefix. If ambiguous, Gradle suggests candidates. ⚠️ Use locally for speed, but keep codebase references explicit for readability!

5 ways motion elevates your product: 1️⃣ Emphasize information hierarchy Guide attention effortlessly. 2️⃣ Add delight Make interactions feel magical. 3️⃣ Provide feedback & status Keep users informed in real time.

Jeudi 16 octobre à 12h, je serai en direct avec Mathias de The Product Crew (TPC pour les intimes) pour parler engineering et produit ! Hâte d’échanger avec vous et de répondre à vos questions. À très vite !

We built a custom animatable, collision-aware, collapsible annotation system on Google Maps. Huge UX improvement but we lost tilt support along the way. We finally cracked the math and extended our projection calculations adding a whole new dimension to the map. Just gorgeous.

In the age of AI agents, a monorepo isn’t just a dev setup. It’s a competitive edge. Everything in one place means agents can explore, analyze, and act across your entire codebase, seamlessly.

🚀 Introducing OpenZL, a new #opensource, format-aware compression framework! It uses a unique “graph model” for compression, enabling modular, high-performance codecs and a universal decoder - perfect for structured data at scale Link: https://loom.ly/z09xoNw#opensource #DataCompression

Software engineering is evolving fast thanks to AI. At amo, we built a team dedicated to leveraging AI across our stack. Our experience so far is pretty clear. AI isn’t (yet) great at building features to our craft standards. 1/2

Great animations should always add value. But if they also bring delight, that’s a win 🏆. Instead of a generic 'Search', explicitly specify what’s searchable and animate each character individually. It subtly guides users, catches the eye, and feels uniquely crafted.

One of the most underrated parts of my job is "chaos management". Turning disorder into order, and slowing down entropy before it speeds up. It’s the invisible work that keeps everything running smoothly.

Just received "Code Health Guardian" today. Can't wait to go through it 😋

We already had incremental compilation in the single-digit seconds range, but I’m still blown away by how much faster it is now that the entire codebase is fully on Metro. 🤯 github.com/ZacSweers/me...

Ever wish you could see what your friends are up to? Even when they’re off-screen? With sticky pins in Bump by amo, you can now spot friends typing in chat or sending super sends, no matter where they are on the map. ✨

🪦 Android Instant Apps 🪦 2016 - 2025 R.I.P.

There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies and the other way is to make it so complicated that there are no obvious deficiencies. – Tony Hoare

I’ve spent my entire career in startups. Why? • I build things, not just org charts. • I move at 10x speed, no alignment meetings required. • I’m a generalist, not a cog in a machine. • My impact > my title.

Interviewing engineers is like watching kids play with blocks: • Some struggle with Duplos. • Some follow the manual. • Some build castles from thin air.

Here are the slides for the "Navigating Dependency Injection with Metro" talk I just gave at DroidKaigi. Great conference and super well-organized. speakerdeck.com/zacsweers/na...

NADD - Naming Avoidance-Driven Development - for the win! Just refactored an API to avoid the impossible: naming things. Because if we can’t agree on a name, we’ll just make it disappear 😅.

Code consistency is the backbone of scalable tooling. As your codebase grows, inconsistency becomes technical debt that cripples automation, refactoring, and even AI-assisted workflows. Consistency enables tooling, and tooling enables scale. Ignore it at your peril.

This week in frontend engineering: • Wrote an iOS strings file parser • Reviewed a Liang-Barsky implementation • Built a URI matcher using a tree • Debated efficient geospatial collision detection Who said frontend is about tweaking padding and building UI like Lego blocks?

Nouvelle saison ? Nouveau site ! Nous sommes ravis de vous présenter le tout nouveau site du Paris Android User Group ! ▶︎ paug.fr Un grand merci à toutes celles et ceux qui font vivre le PAUG et rendez-vous sur le site pour découvrir ce qui vous attend en 2025–2026

Flat surfaces are boring. Textures, when used thoughtfully, can transform user experience. We added subtle Perlin noise to our map tiles. Why? It helps users "anchor their eyes" to something tangible, reducing disorientation when zooming in/out. Small details, big impact. 🧵👇

OMG, I can finally review PRs without having to manually download images to view them in the finder 💥 github.blog/changelog/20...

Is anybody working on function-based DI framework? Most (all?) frameworks are class-based and don't fit well with Compose (function-based). …and yes I know about compositionLocalOf. But it's not checked at compile-time and is generally just for singletons.

Super excited today! I just completed the migration to a new cross-platform, type-safe, and modular deeplink framework. I’ve had this in mind for years but never implemented it. An interesting challenge was dealing with modularity and supporting multiple apps.

TIL about the 'super<Type>' expression in Kotlin. Reading a programming language grammar is always super insightful even though it's not useful everyday 😅. kotlinlang.org/docs/referen...

Investigated a broken internal-only feature this morning. Eventually found out it was actually not in the binary anymore. That's one of the problem of extreme modularity, it is (too?) easy to add/remove a feature from an app. With great power comes great responsibility 🕷️

Murphy’s Law is undefeated: your infrastructure will go down. But just because outages happen doesn’t mean your frontend should fall apart. 💥 Designing mesmerizing error states can ease user frustration … and buy engineers time to fix the issue.

Just discovered Internal App Sharing today. Completely missed it back then. Anyone using it? I'd love to have your feedbacks 😊 play.google.com/console/abou...

Bezier paths are pure magic ✨. This animation appears when your friends interact: smooth curves, vibrant gradient, particles dancing along the curve, sleek 3d effect. All made possible by the power of Bezier paths bringing UI to life.

When building a product, you sometimes need randomness that is repeatable (e.g. generating textures, shuffling lists). The solution is super simple: seed your random number generator with a fixed value.

Most think engineering growth is about scaling systems. That’s the easy part. Scaling culture and knowledge sharing is by far the biggest challenge.

James Lovell 1928 - 2025 Guided us through the stars.

The droidcon NYC 2025 videos were uploaded a few days ago. I finally took the time to upload the slides from the eulogy talk that @BQuenaudon and I gave about Instant Apps. Enjoy them until December 2025 ☠️… cyrilmottier.com/posts/2025/i...

I've been coding with bunch of different programming languages/environments over my career. The only one having true (i.e. compile-time) DI frameworks is Java/Kotlin. All other options I found are poor (i.e. runtime) DI / basic service locator. Did I miss something?

Building a suite of intercommunicating apps introduces unique challenges that very few engineers encounter: extreme modularization, cross-app data communication/persistence, inter-app navigation/deeplinks, and much more. It adds an entirely new & exciting dimension to mobile software engineering.

Obviously super aligned with everything that is discussed in here. Must read/watch 😎

Building this signature scratchmap recap animation was a lot of fun 🤩. It involved clustering scratched hexagons with H3, smoothly interpolating camera movements thanks to a centripetal Catmull-Rom spline, and adding some flair with animated WebP hexagon explosions.

Playing around with the UI for fun. Designing such micro-interactions and animations is a breeze thanks to Compose. P.S. If you didn't catch it, a full vinyl rotation takes exactly 1800ms. That's 33 RPM 🎶💿

Some colleagues question my high standards during interviews. I don't do it me. I do it for them. Ensuring new hires meet the bar helps retain a strong team.