Enforcing a concrete performance budget for Expo EAS builds and OTA updates
The situation Say you are a mobile engineer on a small React‑Native team that uses Expo Application Services (EAS) for CI‑driven builds and over‑the…
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One .web.tsx in the whole app, and it is 196 lines of stack navigator that no phone will ever run
Munchable's phone app is also a website. Same Expo Router tree, same screens, exported with web.output: "single" and served at app.munchable.app . A…
Deep‑link crashes in Expo Router when the app hits real traffic
The situation You are a mobile lead on a React Native product that just shipped version 2.4 with Expo Router 2.1.0. The release added a “share‑to‑ap…
Unexpected UI glitches after enabling React Native Fabric
The situation Say you are the lead mobile engineer on a cross‑platform product that ships a daily active user base of ≈ 500 k. The next sprint’s mil…
Migrating a React Native app to the new EAS build and OTA workflow without a release freeze
The situation You are the lead mobile engineer on a React Native app that ships to 150 000 active iOS and Android users. The app currently uses the…
Unexpected UI‑Thread Jank When Using Reanimated 4 Worklets
The situation You are a mobile engineer on a small React‑Native team (React Native 0.73, Reanimated 4.5). The sprint goal is to implement a draggabl…
I Built a Bilingual "Mini-Uber" for My Dad's Escalade Business
I Built a Bilingual "Mini-Uber" for My Dad's Escalade Business My dad drives a Cadillac Escalade. He's licensed in California (TCP permit — the real…
Google Play ads declaration: check formats before submission
A Google Play “Contains ads” declaration is a small release task with an app-wide answer. Before you submit, Play Console asks whether your app cont…
Android 15 edge-to-edge: fix screens before content hides behind system bars
Android 15 changes how an app’s window meets the edges of the screen. For apps targeting Android 15 (API level 35) or higher, edge-to-edge display i…
Android advertising ID: check the AD_ID permission before targeting Android 13
Android advertising ID work can look like a one-line manifest change. The risky part is deciding whether your app or one of its included libraries u…
Apple's EU payment options: compare fees and checkout costs before launch
A lower platform commission can look like an easy win until you count the work around it. If your subscription app sells digital services through th…
Six mobile app UIs you can tap through in a browser tab (Expo + React Native Web)
A screenshot of an interface tells you what it looks like. It doesn't tell you how it feels — what happens when you tap, how a sheet rises, whether…
Defending the 16ms Frame: A Performance Budget for React Native TurboModules
I was the first engineering hire at Synapsis Medical Technologies, where I owned the architecture for a HealthTech AI platform from day zero. We wer…
The Hidden Performance Ceiling of React Native Skia in Production
I was three weeks out from a major release for a clinical HealthTech platform when we hit a wall that didn't exist in our staging environment. We we…
Native incoming calls in React Native: CallKit on iOS, full-screen calls on Android
From the Streaming CDN team. The original, kept up to date, is at streaming-cdn.ewin888.com/guides/react-native-incoming-call-screen . A calling app…
On-Device Computer Vision in React Native: Auto-Aligning Progress Photos with MediaPipe and Expo
A person can take thirty photos of the same face and still produce a timelapse that looks like camera shake. On Monday they stand closer to the mirr…
If you fail, you owe money to the cause you hate most. So every screen-time bug in my app is a billing bug
Go one minute over your Instagram limit and you owe $15 to the NRA. Or to Everytown. Or to whichever organisation makes your skin crawl. You picked…
Building Instagram Reels-style video feeds in React Native with reels-kit
An open-source React Native toolkit for vertical video feeds: snap paging, bounded video players, tap and scrub gestures, and pluggable video adapte…
Building a Photo-Based Card Grader: Computer Vision Where the LLM Doesn't Pick the Score
Trading-card grading looks like an image-classification problem until you try to build it. A grade is driven by several physical properties at once:…
File-Based Routing Explained (Next.js, Expo Router & Why Your Folder Is Now Your Router)
TL;DR File-based routing = your folder structure is your route config. No routes.js , no giant switch statement. The core conventions are nearly uni…
React Native vs Flutter in 2026: Which to Choose
Originally published on the MatrixInn Solutions blog . React Native vs Flutter is still the first real decision most teams make when they commit to…
Expo SDK 58 beta opens with iOS 27 support and a faster build pipeline
You update your simulators, iOS 27 drops, and every app you haven't rebuilt yet either misbehaves or just looks wrong on the new scene-based life cy…
Introducing Buoy.gg — in-app tools for mobile + web apps
When something breaks in production, the usual loop is slow: reproduce locally, dig through logs, guess at what the user saw, then ship a fix and ho…
From bug report to verified pull request: how an agent fixes bugs using EAS Simulator
A user files a bug report that says "Settings crashes when I scroll to the bottom." No stack trace, no reproduction steps, no screen recording. You'…
React forgot to add something.
It is a simple and humble Global state management . I know, Now you are thinking "Why not React context or any others?". The answer is simple. Peopl…
Deferred Deep Links in React Native: Complete Integration Guide
If you've shipped a React Native app, you've probably wired up universal links / app links already. Existing users tap a link, the OS hands it to yo…
I built a to-do app that hatches creatures because I couldn't make myself do anything
The confession first I am a software engineer. I ship things for a living. And I have never once, in my adult life, opened a to-do app and felt anyt…
Looking for a co-founder who thinks in products, not just pixels
I'm not looking for a designer to make our startup look good. I'm looking for someone who might change what we decide to build. Some people see a we…
Shipping my first mobile app: what an operations leader learned taking PromptSpend to iPhone and Android
I spent 15 years running operations and P&Ls, not writing apps. In August I set out to put PromptSpend, my open-source LLM cost calculator, on i…
MAUI vs React Native vs Flutter vs Ionic
An Honest Cross-Platform Comparison — No Sugar Coating Cross-platform development promises something attractive: build once and run everywhere . The…