Bitácora
Working notes from the studio — trading systems run on real capital, engineering decisions made alone, and the consulting playbooks behind the products. Documented honestly, losses included.
- trading
Evidence gates: why no strategy touches live capital without proof
Every strategy has to clear the same bar before it sees a single dollar — out-of-sample windows, walk-forward validation, and a kill switch I trust more than my own optimism.
8 min read - trading
The March drawdown, documented in full
I lost real money in March. Here is the equity curve, the exact decisions, and what the post-mortem changed in the risk engine. Losses included, as promised.
11 min read - engineering
Architecture you can run alone at 3am
Five products, one engineer. The constraint forces good decisions: boring stacks, aggressive observability, and a hard rule that everything stays shippable by one person.
7 min read - consulting
Rails upgrades that do not explode
A repeatable playbook from a decade of rescuing legacy Rails apps: how I sequence the upgrade, where teams usually get burned, and the tests that actually matter.
9 min read - product
Notes on fatigue prediction for Kraft
Modeling athlete fatigue is mostly a data-quality problem, not a modeling problem. What I learned wiring training load and wellness signals into something coaches trust.
6 min read