Star Sign Lotto — Numbers From Your Zodiac
Your birth date finds your star sign, and its lucky numbers go into every pick, marked on the balls so you can see where they came from
Fadongkwon Soft
Fadongkwon Soft
A solo developer building small apps after work — and writing down what the process actually taught me.
Car Number Lotto — Numbers From Your Plate
Your licence plate becomes the seed for Korean Lotto 6/45 and Pension Lottery 720+ picks, with an every-past-draw replay that scores how the method would have done
Daily Money Quiz — One Question a Day
Deposits, loans, taxes and pensions across ten topics, one question a day, with plain-language explanations and a wrong-answer notebook
Daily Korean History — One Question a Day
Ten eras from prehistory to the present, one question a day, with an explanation for every answer, a wrong-answer notebook and per-era accuracy
My Ad Account Was Suspended 29 Days for Invalid Traffic — The Culprit Was My Own Dev Phone
On August 26 my ad publisher account was suspended for 29 days over invalid traffic, with no appeal available. Auditing every codebase turned up a cause that was not malicious clicking but builds c...
Apps in Toss Is Changing How Mini Apps Get Found — Notes From the PO Webinar
On 21 September three Apps in Toss product owners spent ninety minutes on what is changing. A quality sweep of every non-game mini app, the end of promotional push, why ad rates fell, and a three-t...
Sequence Memory — Watch the Lights, Repeat the Order
Four, six or nine pads, one more step every round, a shared Daily Sequence with streaks and TOP 10 rounds per mode, now on Google Play and Apps in Toss
Mole Tap — Sixty Seconds of Reflexes
A mole is +1, a gold mole is +3 and a bomb takes 2 away, across three difficulties with combos and six rank badges, now on Google Play and Apps in Toss
Fixing a "Cold Start Over 20 Seconds" Rejection Twice — 20 Seconds Is When the Screen Stops Moving
Apps that paint in 0.2 seconds on our machine were rejected for taking over 20 seconds to open. The first cause was outbound requests during the first paint. After fixing that they were rejected ag...
Turning 27 Games Into Reels — 1.5x Speed, 9:16, and Links That Do Not Click
Our Instagram account had 27 posts and not one video. The gameplay clips recorded for YouTube Shorts were already sitting there, so we re-cut all of them into Reels. Here is what mattered — why 1.5...