Shipping an Expo app to the App Store: the landmines nobody warns you about
I recently shipped Add to Calendar: AI Events — an iOS app that turns screenshots and text into calendar events — built with Expo SDK 52 and React Nat…
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Shared UI Means Shared Contracts, Not Shared Hosts
A component can compile in a shared assembly and still be impossible to construct in one of the applications that renders it. That is easy to miss whe…
Port Support You Can Trace Back to a Green Test
“Supported on iOS, Android, desktop, and web” sounds useful until you need one method on one target. Does WebSocket work on watchOS? Which Linux archi…
Nobody Hands You Day One: Stepping In as CTO on a Live Product Across Three Runtimes
Most engineering stories start at day one with a clean repo. This one did not, and I think the messy version is the more useful one to read. I stepped…
Building a Parking Puzzle in Unity: A Systems Breakdown of the Park Match Mechanic
Parking and matching puzzles look almost insultingly simple from the outside. A few cars, a cramped lot, tap or drag to move them out. But if you've a…
Building Knowzup: Architecting a True Multimedia Q&A App as a Solo Developer in React Native
Building Knowzup: Architecting a True Multimedia Q&A App as a Solo Developer in React Native How I built a cross-platform community knowledge hub …
Firebase Analytics in React Native — Complete Implementation Guide
Analytics is one of the most valuable tools you can add to a mobile application. While building features is important, understanding how users interac…
React Native List Performance — ScrollView, FlatList, SectionList, FlashList
Your feed scrolls fine with 20 items. Ship 2,000 and the UI starts hitching, memory climbs, and “just wrap it in a ScrollView ” becomes the bug report…
Running Android on my own hypervisor — what I learned in one month. 11 partitions, 1.7GB sparse images.
I've been building IONA OS — a sovereign operating system written entirely in Rust — for the past 13 years. This month, I decided to run Android on it…
Building the AI Fallback Ladder Behind LOCK TF IN (an app that roasts you into working out)
I just shipped my first solo iOS app: LOCK TF IN — a fitness accountability app where an AI drill sergeant roasts you when you skip a workout. Log a s…
Podcast Apps: A Framework for Dying Slowly with Dignity
Independent podcast apps are not growing as a category. This is not a particular secret, but perhaps you haven’t seen it stated explicitly. It’s the s…
I Put Real Planes in the Sky With AR. The 3D Was the Easy Part.
A few years ago I would have told you AR was a graphics problem. You get a 3D model, you get a camera feed, you draw one on top of the other. Ship it.…
One C# Core, Three Platforms: What Shipping a Background Networking SDK Taught Me
Most "cross-platform" war stories are really UI stories: one framework draws the same button on two phones and everyone calls it a day. The one I want…
What breaks when nobody touches your app for three years
An app can die without a single line of its code changing. Nothing breaks inside; the world around it moves. A demo — or an AI-generated prototype — s…
I built an offline-first sync engine with event sourcing, in Rust shared between mobile and backend
A small, honest write-up of a thing I built mostly for fun, that somehow ended up working. Code: github.com/teimuraz/rust-mobile-offline-sync First, t…
How We Beat HotSpot Performance (By Cheating, But Not Like That)
No, we didn't cheat in the benchmark. At least I hope we didn't. Every optimization in this story was gated on bit identical output checksums against …
Building Recourse.ai: A Parametric Insurance Prototype for the Age of Agentic AI
Every enterprise I've talked to in the last year has the same story: AI agents are being deployed faster than risk and compliance teams can review the…
H5 or Native App for QR-Based Device Rentals? A Decision Framework
A QR code makes a device rental look simple: scan, pay, unlock, return. The client experience behind that QR code is not simple. A product team still …
Synchronous TurboModules Are Not Automatically Fast
React Native’s New Architecture gives JavaScript more direct access to native functionality. One important capability is synchronous communication thr…
Unify Web and Mobile Development with OTF's Cross-Platform Components
I've shipped three Buttons to production. The web one lives in your JS bundle. The iOS one is a SwiftUI view. The Android one is a Compose composable.…
Building PathFindr: An AI-Powered Campus Navigation App with Expo and Sarvam AI
Navigating a large university campus can be overwhelming, especially for new students, visitors, and even returning students attending classes in unfa…
Cookies or Bearer Tokens? The Day my Auth Design Decision Broke.
It's been 3 months since I was actively building StashD -- a link-organizing app. NextJs on the frontend, Flask + MongoDB on the backend. Auth was one…
Building a Cross-Platform E-commerce App with Flutter: Architecture, Challenges, and Lessons Learned
When building an e-commerce application today, users expect more than just a catalog of products. They expect instant search, secure payments, real-ti…
Hello World! 👋 I'm Pablo, Android Dev & Creator of Aura Finance
Hi everyone! 👋 I’m Pablo Martín, a Mobile Engineer and Android Architect based in Spain. For over 5 years, I’ve been building, scaling, and leading na…
Apple TV And Android TV: One Codebase, And CSS @media For The Living Room
This is the Tuesday follow-up to Friday's funding open source without the bait and switch , and it picks up right where last week's Apple Watch port l…
Privacy Isn't a Checkbox — It's Architecture
Privacy isn't a checkbox. It's not a statement in your terms of service. It's not a toggle in your settings app. Privacy is architecture. And most app…
Designing Hybrid Edge AI Systems for Low-Latency Intent Classification in Mobile Applications
A Hybrid Edge–Cloud Architecture for Low-Latency Intent Classification in Mobile Applications Abstract Large Language Models (LLMs) have fundamentally…
Questions to Ask a Mobile Dev Partner About Store Accounts, Release CI, and Handover
A question list for founders and tech leads before the contract is signed. The proposal lists features, design, and a twelve-week timeline. It says "A…
Game Builder Tutorial 1: Build a 2D Platformer — Duke's Coffee Run
Most game tutorials make you hand-place every sprite in code. The Game Builder flips that around: you draw the level visually, tag objects with the nu…
How to Test On-Demand Logistics Apps: From Booking to Doorstep Deliver
Testing a food delivery app is hard. Testing an on-demand logistics app is harder. Food delivery has a fixed pattern: one restaurant, one customer, on…