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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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…
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…
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…
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…
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:…
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'…
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…
React Native Environment Setup: Managing Dev, Prod, and Staging Builds with Android Flavors and iOS Schemes
During my React Native development journey, I faced several issues managing dev and prod environments — API URLs, Firebase configuration, Android fl…
You Released an App. Now What?
Releasing an app feels amazing for about five minutes. You hit publish. You refresh the store page. Maybe you send the link to a few friends. Maybe…
OWASP Mobile Top 10 — M6: Inadequate Privacy Controls
Welcome to the sixth article in our OWASP Mobile Top 10 2024 series! In previous articles we covered M1 through M5. Today we reach the most unusual…
Google Sign-In Works in Debug but Fails in Production on Android? Check This Hidden SHA-1
Google Sign-In worked on my development build. It worked on my preview build. On the version Google Play delivered to real testers, tapping "Sign in…
Claude Code on a React Native Codebase: Guardrails That Actually Change the Output
Every React Native developer has run the same experiment by now: point an AI agent at the codebase, ask for a feature, watch it produce something th…
Why Retrieval Quality Beats Model Choice
When I architected the 0 to 1 stack at Synapsis Medical Technologies, the pressure to chase the latest LLM was constant. In a HealthTech AI environm…
Expo Router auth guards that survive expired sessions and deep links
Most Expo apps get sign-in working on the first day and get auth guards wrong for the next six months. The login screen appears, the token lands in…
How SWSH turned 300 monthly builds into a release pipeline nobody has to babysit
"Expo's ecosystem helped us take human error and effort out of the release process, from a local build to a validated release." — Nathan Ahn, CTO, S…
Hermes Bytecode and the Cold-Start Budget: Engineering Time-to-Interactive as a Product Requirement
In the lifecycle of a mobile application, the most expensive milliseconds are the ones that occur between the user tapping the icon and the first me…
Android Developer Verification hits Brazil on September 30
Google's developer verification requirement starts enforcing in about a month, and Brazil is one of the four countries it lands in first. If you wor…
How We Keep a Trunk-Based Pipeline From Being Reckless
Part 1 covered the mechanism: a fingerprint gate decides whether a change ships in minutes over-the-air or needs a full store release. But a gate th…
How I built an AI movie tracker as a solo dev
I am a full-stack developer in the Netherlands, a bit over ten years in. For the last year my evenings have gone into one side project: I Like Movie…
Why your App Tracking Transparency prompt doesn't show up (and how it got my app rejected)
App Review rejected my iOS app under Guideline 2.1. The note said reviewers were unable to locate the App Tracking Transparency permission request w…