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…
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…
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…
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…
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…
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…
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…
I Built SnapList to Make Product Research Less Messy
When I’m researching something I want to buy, I usually end up with the same problem: Too many tabs. Too many screenshots. Too many links. And event…
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…
Teaching our on-device assistant to say "I don't know"
We're building FamiliaSync , an offline-first family organizer where all data stays encrypted on your own devices. That constraint extends to the as…
How to Hire a React Native Developer for Your Startup MVP
Your MVP hire decides how fast you get to real users and how much you'll spend rebuilding later. Here's how to actually get it right. Hiring the wro…
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…
Engineering RAG Pipelines That Survive a HIPAA Compliance Audit
When building Retrieval-Augmented Generation (RAG) systems for clinical environments, the technical challenge isn't the vector search or the prompt…
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…
What Bridgeless Mode Actually Changed in React Native
For nearly a decade, the architecture of React Native was defined by a single, asynchronous bottleneck: The Bridge. During my eight years in profess…
Offline-First in React Native: Building an Auto-Sync Engine That Users Never Think About
By Shivkrishna Shah · Engineer Philosophy — @shivkrishnashah · @engineerphilosophy Your app shouldn't have a "no internet" screen. Here's the archit…
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…