DNS Spoofing Testing on Android — What It Is, Why It Matters, and 4 Hands-On Lab Approaches
When your app calls api.mybank.com, who decides which IP that resolves to? On compromised Wi-Fi, the attacker controls DNS and points your domain at t...
Articles in Performance & Security
Why Your Push Notifications Work on Pixel and Fail on Xiaomi — FCM Across OEMs
I don't get notifications until I open the app. Then they all arrive at once. My friend on iPhone gets them instantly. Your app is broken." The user i...
Secure File Upload on Android — Chunked, Resumable, Encrypted Uploads for Banking & Enterprise Apps
Upload a file" sounds basic, and the tutorials treat it that way: build a MultipartBody.Part, hand it to Retrofit, done. Then you ship it to a banking...
Google Maps SDK on Android — Implementation Deep-Dive Beyond the Tutorials
The Google Maps tutorials online stop at exactly the wrong place — drop a map, add one marker, done. They don't teach what happens when you buil...
OEM Battery Optimization Killing Your App — A Survival Guide for Samsung, Xiaomi, Huawei, and the ColorOS Family
The fitness app stops counting my steps after a few hours. Started happening on my new Samsung — my old Pixel was fine." The user thinks the app...
Android Root & Tampering Detection — Play Integrity, RootBeer, and the Cat-and-Mouse Reality
Root detection on Android is a cat-and-mouse game where the cat keeps losing. Every check you write, someone has a Magisk module that defeats it. Ever...
Android Security for Banking & Enterprise Apps — Threat Model, Keystore, Cert Pinning, and the OEM Realities
The first time I worked on a banking app, I learned the threat model is fundamentally different. Consumer apps protect against bugs; banking apps prot...
R8 / Proguard — The Mental Model, Keep Rules, and a Debugging Workflow That Actually Works
Every Android developer eventually ships a release that crashes on launch. Debug works perfectly. Then Crashlytics lights up with NoSuchMethodError &m...
App Startup Optimization — Measure, Trim, and Ship Baseline Profiles
Cold start is the most ruthless metric in mobile. Users decide whether to keep your app in the first 1.5 seconds — yet I've seen apps take 4+ se...
Android Memory Leaks — The Five Patterns That Cause 90% of Them, and How to Fix Each
Three years ago I inherited a music app where memory climbed steadily during playback — 180MB after launch, 420MB after an hour, OOM crash after...