ESP32 Web Serial API: Live Sensor Data in Next.js
What we built An ESP32 plugged into a PC over USB, with a web app (Next.js) connecting directly to the serial port through the Web Serial API and sh…
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Why I Built an Unbypassable, 100% Offline Android Focus App with Kotlin & Jetpack Compose
The Problem with 99% of App Blockers We’ve all been there: You download a screen time tracker, set a 30-minute Instagram limit, and the moment you c…
Architecting for Zero-Data Privacy: How I Implemented Android's Local-Only SQLite Architecture in Muffle
The Silent Crisis I was sitting in the front row of a Friday Jumu'ah prayer. The imam had just begun the khutbah, the room was perfectly still, and…
Secure Your APIs: OAuth2 and JWT for Beginners
Secure Your APIs: OAuth2 and JWT for Beginners APIs are frequent targets for bad actors since they expose data and functionality. Securing them whil…
Building Custom Geofencing for Android Without Google Play Services
It happened during a critical team meeting. The room was silent, the project lead was outlining the Q4 roadmap, and then, my phone erupted with a lo…
Why HTTPS Won’t Save Your Checkout Flow: Building Zero-Trust State Machines in Kotlin Multiplatform
How to protect multi-step workflows, fin-tech funnels, and Server-Driven UI from step-skipping, state tampering, and replay attacks — with zero runt…
Building an Excel download API with TBEG and Spring Boot (Kotlin/Java)
In Part 3 , we explored TBEG's template syntax in depth. Now let's build an Excel download API with Spring Boot + TBEG - the most common real-world…
Kotlin Coroutines vs Java Virtual Threads: A Comprehensive Comparison for Modern Backend Development
Kotlin Coroutines vs Java Virtual Threads: A Comprehensive Comparison for Modern Backend Development Introduction: The Concurrency Evolution The lan…
Architecting a Privacy-First Android App: Why Local-Only Storage Beats Cloud Sync
It happened during a job interview. My phone decided that the precise moment I was explaining my technical background, it needed to play a loud, upb…
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…
Do We Really Need Reflection or Code Generation for JSON in Kotlin? Building a Lightweight JSON Library
Building a lightweight Kotlin/JVM JSON library with a direct JSON representation and optional reflection-based mapping between JSON and Kotlin class…
How I Structured My First KMP App: Modules, Layers and Source Sets
A walkthrough of the modules, source sets and Gradle setup behind a Kotlin Multiplatform app on Google Play. Part 2 of “Building an Exam Prep App wi…
System Design: How to Build a Networking Library Like Retrofit or OkHttp
System Design: How to Build a Networking Library Like Retrofit or OkHttp Networking is one of the most important infrastructure layers in a modern A…
Android System Design: A Complete Guide for Android Developers
Android System Design: A Complete Guide for Android Developers Modern Android development is no longer only about creating screens and connecting AP…
Android App Security: A Practical Guide to Building Secure Android Applications
Building an Android application is not only about creating a good UI and connecting it to an API. Modern Android applications handle sensitive infor…
Navigating the Android background lifecycle: Lessons from building Muffle
It was the middle of a Friday afternoon, and I was sitting in a quiet, hushed room for a Jumu'ah prayer. The space was packed, the atmosphere solemn…
Sachin Mandawi — Software & Android Developer | Open-Source Projects & Portfolio
Hi DEV Community! 👋 I'm Sachin Mandawi , a Software & Android Developer from India focused on building privacy-first Android utilities, system t…
Your thresholds do not belong in constants
Every tuning change needed a code review, a release, and a week of store rollout. So we stopped tuning, which is the worst possible outcome. Eightee…
Pragmatic AI-Driven Workflows: Refactoring Legacy Kotlin Code with Gemini in Android Studio
Maintaining legacy Android codebases often feels like taking care of an ancient engine while driving on a highway. Thousands of production apps stil…
Architecting a Low-Power GPS Geofencing Engine for Android Background Services
The board meeting was moving into its third hour when my phone decided to belt out an aggressive notification chime. It wasn't just a ping; it was a…
Deferred Deep Links in Android: Complete Integration Guide
Same problem as always: a user without your app taps a link, gets routed to the Play Store, installs, opens the app — and lands on the default launc…
Invariants are cheap. Silent corruption is not.
We had five numbers that were supposed to add up. Nothing in the codebase checked that they did. The relationship nobody wrote down A tracked journe…
Kotlin + Vision-Language-Action Models for Robotics
Kotlin + Vision-Language-Action Models for Robotics What You Will Build By the end of this tutorial, you will have a Kotlin-based architecture for t…
Kotlin + TensorFlow Lite for Robot Vision
Kotlin + TensorFlow Lite for Robot Vision What You Will Build By the end of this tutorial, you will have a Kotlin-based architecture for the selecte…
Building a Kotlin Dashboard for NVIDIA Physical AI
Building a Kotlin Dashboard for NVIDIA Physical AI What You Will Build By the end of this tutorial, you will have a Kotlin-based architecture for th…
Kotlin + Jetson + Isaac ROS for AI Robots
Kotlin + Jetson + Isaac ROS for AI Robots What You Will Build By the end of this tutorial, you will have a Kotlin-based architecture for the selecte…
Kotlin Coroutines for Real-Time ROS 2 Robot Data
Kotlin Coroutines for Real-Time ROS 2 Robot Data What You Will Build By the end of this tutorial, you will have a Kotlin-based architecture for the…
Optimizing ROS 2 Communication from Android Kotlin
Optimizing ROS 2 Communication from Android Kotlin What You Will Build By the end of this tutorial, you will have a Kotlin-based architecture for th…
Kotlin + ROS 2: Building a Robot Telemetry Dashboard
Kotlin + ROS 2: Building a Robot Telemetry Dashboard What You Will Build By the end of this tutorial, you will have a Kotlin-based architecture for…
Android Kotlin + ROS 2 for Real-Time Robot Control
Android Kotlin + ROS 2 for Real-Time Robot Control What You Will Build By the end of this tutorial, you will have a Kotlin-based architecture for th…