Cosmin Pop
Software Testing
Stop hardcoding test IDs: discovery-first test data with a ScenarioResolver
Jun 12, 2026Hardcoded entity IDs go stale the moment someone reshapes your shared test environment. I banned them: every spec names the shape of data it needs, and a ScenarioResolver finds a real entity at fixture time.
Arduino / ESP32
Taking back your Growatt inverter: local control with ESP32 + Modbus (part 1)
Feb 21, 2026Wire a cheap ESP32 and RS485 transceiver to a Growatt SPH5000 inverter, flash ESPHome, and get a local Modbus web UI for monitoring and control. No cloud, no app.
Software Testing
Automated Playwright Authentication with Microsoft SSO Push Notifications in CI/CD
Dec 30, 2025Security said no to TOTP, no to service accounts, no to disabling MFA. So I built a solution that uses OAuth2 refresh tokens to maintain Playwright browser sessions in CI/CD, without ever triggering push notification MFA after the initial setup. Here's the COSMIC Auth Pattern.