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Field notes from building How Are You?!

Blog

Experience, thoughts, disappointments, successes, and technical advice from building a 24/7 Android safety app for elderly parents.

Why this blog exists

I build How Are You?! — a safety-critical Android app that quietly watches an elderly parent's phone 24/7 and emails their family if something looks wrong. Working on it surfaces a steady stream of stories: OEMs that quietly kill background services, a bug that hid for 21 hours, an AI prompt that learned the wrong thing, an OTA that wiped six months of careful permission setup in a single night.

Some of these I post on the usual platforms. Many I don't. Every platform I've tried rewards seniority — how long you've been there, how many followers, how well you play the algorithm — over whether what you wrote is worth reading. Something written this week, by someone the system doesn't recognise yet, doesn't compete on equal footing with content that has neither more insight nor more truth in it.

So this is the unfiltered version. A place where I share experience, thoughts, disappointments, successes, and technical advice from building How Are You?! — without anyone deciding it's too technical, too venting, or too boring before it reaches you. Long, short, niche, useful, useless. If something isn't for you, scroll. If it is, glad it found you.

— Stoyan

Posts

11 min read

Honor watched my Android app come back from the dead — and revoked the battery exemption that let it

I write a safety-critical Android app that watches a phone 24/7 — motion, GPS, screen activity — and...

12 min read

I pushed my Android app to production. Then Android and the OEMs spent two weeks tearing it apart.

I build a safety-critical Android app that monitors elderly people living alone. It watches the phone...

5 min read

A single Kotlin lambda silently broke my app for 21 hours - and I only found the bug because I crossed a border

I build a safety-critical Android app that monitors elderly people living alone. It watches their...

8 min read

I built a 126K-line Android app with AI — here is the workflow that actually worked for me

Most developers trying AI coding tools hit the same wall. They open a chat, type "build me a todo...

12 min read

What Android OEMs do to background apps, and the 11 layers I built to survive it

I spent over a year building a safety monitoring app that runs 24/7 on elderly parents' phones. If it...

4 min read

I spent several months building an AI safety app for my elderly parent — here is what I learned

My parent lives alone. After a fall that nobody noticed for hours, I decided to build something that...