Hi, I'm Oscar Calvo 👋

Software Engineer · building native Windows apps · Seattle area, WA
Native Windows apps & dev tooling by day · Home Assistant / smart-climate tinkering by night

_{Recruiters: I'm happily employed and not looking for a new role — thanks!}

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About me

• 💻 18 years at Microsoft (2007–2025): the distributed build system every Windows engineer uses, modernizing MSBuild in the Windows build pipeline.
• 🎨 Years in Windows UI / XAML / WinUI (including the new Terminal console window) and helped Adobe move their app suite onto the Windows App SDK.
• 🔧 In Visual Studio I shipped CodeLens, the Fakes stubs/shims framework, the ground-up XAML unit-testing window (scales to 100k tests), and the VS 2010 UML tools.
• 🛠️ Off the clock I build developer tooling for Windows as PowerShell modules (PwrSudo, PwrRazzle, PwrCortex, …).
• 🏠 I run a heavily automated home: Home Assistant, Z-Wave, and a custom smart-climate stack for Midea/CCM15 HVAC (py-ccm15).
• 🎓 MSc & BSc in Software Engineering, Costa Rica Institute of Technology.
• 📍 Seattle area, WA

Tech & tools

Open-source contributions

Merged pull requests, public and live (click any badge to see the PRs):

In projects I don't own:

_{Counts reflect public open-source PRs only — work in private/internal repos isn't shown.}

Highlights: microsoft/terminal · microsoft/WinUI-Gallery · microsoft/Xaml-Islands-Samples

What you'll find here

Project	What it does
PwrSudo	Unix-style sudo (Execute-Elevated) for PowerShell
PwrRazzle	Sets up a Razzle environment for Windows Apps development
PwrCortex	PowerShell automation module
py-ccm15	Python library for the Midea CCM15 data converter

🏠 Home automation — @HomeOps

Project	What it does
HASS-Smart-Climate	ESPHome IR climate component for Midea HVAC, with Follow-Me support
ESPHome-Midea-XYE	ESPHome component driving Midea HVAC over the XYE/CCM RS-485 bus
esphome-hass-panels	Touch-screen alarm-keypad firmware (ESP32-S3) — LVGL UI, native HA panel
PwrHass	PowerShell client for Home Assistant — service calls + state queries

Recent activity

1. 🎉 Merged PR #147 in HomeOps/ESPHome-Midea-XYE

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