Good code.
Real impact.
I’m Billie Heidelberg. An engineer, builder, and educator turning complex problems into thoughtful digital experiences.
made an impact
Ideas made real.
That Aisle
Built the React Native mobile app and React admin portal for a hair product discovery and community platform — delivering the full ecosystem from consumer experience to platform operations.
Daily Wick
AI trading journal for prop traders that logs trades, spots patterns, and coaches you with personalized insights.
Baby Tracker
A privacy-first baby tracking solution helping parents monitor feedings, diapers, sleep, growth milestones, and more.
Simmr
A privacy-first social discovery platform for the ENM (ethical non-monogamy) and polyamorous community — with availability planning, couples features, and a resilient, performant architecture.
Learn. Build. Share.
Notes from the workbench. Practical guides, honest lessons, and the things I’m figuring out along the way.
Latest dispatchPlaywright Testing Guide: End-to-End Testing for Modern Web Apps
Read the storyCustomizing Your Local AI Agent: SOUL.md, Skills, and Memory
Running AI Locally with Ollama and Hermes
Angular for React Developers: Signals, RxJS, and Best Practices (2025 Guide)
Good knowledge is better shared.
Always learning, always passing it on.
The human behind the code.Builder’s mindset.
Teacher’s heart.
I care about what happens on the other side of the screen. Whether I’m building a product, untangling a system, or helping a developer find their footing, the goal is the same: make something genuinely useful.