Kevin Stillhammer
Owner at tado°
Wiesbaden, Hesse, Germany
Summary
🤩
Rockstar🎓
Top SchoolKevin Stillhammer is a pragmatic software engineer and founder with over a decade of experience building and leading teams across JVM, .NET and Python ecosystems, currently running his own IT consulting practice from Wiesbaden. He has driven production-grade cloud and IoT systems at companies like tado° and OTTO, delivering scalable Spring Boot services, canary testing at 13k RPS, and cost-saving observability migrations to OpenTelemetry/Signoz. As a hands-on tech lead and architect he has taken products from pre-sales through certification for medical and industrial IoT, improving quality via TDD, pairing and architecture refinements. An active open-source and smarthome enthusiast, he contributes backend improvements to the widely used Home Assistant project (notably the here_travel_time integration), focusing on robust unit handling and API rate limiting. He combines strategic product sense with low-level engineering—automating CI/CD, firmware testbeds and monorepo workflows—to shorten feedback loops and reduce operational costs.
10 years of coding experience
8 years of employment as a software developer
Bachelor's Degree Information Technology, Bachelor's Degree Information Technology at DHBW Mannheim
English, German
Github Skills (9)
asynchronous10
apim10
home-assistant10
api10
python10
async10
asyncio10
configuration-management9
testing8
Programming languages (17)
Github contributions (5)
home-assistant/core
Sep 2019 - Jan 2023
:house_with_garden: Open source home automation that puts local control and privacy first.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:235 reviews, 87 commits, 141 PRs in 3 years 4 months
Contributions summary:Kevin primarily contributed to the `here_travel_time` component, which is related to calculating travel times, suggesting a focus on back-end logic. Their work involved modifying configuration flows and options flows, implementing new features around time settings and origin/destination selection. The user also refactored and improved the unit handling and implemented a rate limiting mechanism for the API calls used by the integration. Further, they removed deprecated imports, and added migration logic.
raspberry-pipythonhouseprivacy-firstasyncio
astral-sh/ruff-action
Nov 2024 - Mar 2025
A GitHub Action to run Ruff
Contributions:1 release, 18 reviews, 78 PRs in 4 months
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