Codeminer42's Engineering Blog
The Miners
ColdCard’s RNG: what about your passphrase?
A complement to Fabio Akita's post on the Coinkite RNG problem (in Portuguese), aimed at people who used a BIP39 passphrase and at the question left hanging: did it protect…
MyJourney: create product demos without wasting a day
GemLab has several projects running at the same time, and all of them change from week to week. Then someone asks how Mother is doing, and the honest answer is…
From Tickets to Conversations: Upgrading Customer Support with Gladly
Customer support is one of those areas where the toolset shapes not just agent efficiency, but the entire quality of the customer relationship. When the CS team at one of…
I built an AI agent for our World Cup betting pool. She beat all of us.
Memory and context engineering for a long-running AI agent: how BETanIA got a diary, a mood, grudges, and a compaction strategy - and won our World Cup pool.
How “Your CFPs Aren’t Good” Became Five Approvals at RubyConf
In April 2025, Tropical on Rails, the Rails conference in São Paulo, said yes to one of our talks for the first time. A few months later, one of its…
