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Open Home Foundation · IT - Software Development

Senior Build System Engineer

· Job Posted February 21, 2026
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Job Description

The Open Home Foundation is looking for a Senior Build System Engineer to join our Ecosystem department on a contract basis for a specific, high-impact project for ESPHome. The goal of this project is to phase out our dependency on PlatformIO. By eliminating PlatformIO from the ESP-IDF path, we remove a third-party dependency that must be maintained and versioned. This simplifies the toolchain and reduces potential points of failure. Crucially, it enables faster issue resolution. This role will involve significant architectural work involving both the large C++ core codebase and the Python code generation component.

Job Responsibility

  • Lead the architectural design to replace PlatformIO's orchestration role within ESPHome with a native, Python-based solution that interacts directly with vendor SDKs
  • Implement direct integration with native toolchains, specifically focusing on the Espressif IDF (IoT Development Framework) using modern CMake
  • Develop the mechanisms within ESPHome's Python backend for toolchain acquisition, version management, and library dependency handling that PlatformIO previously managed
  • Update ESPHome’s existing Python CLI and dashboard code to seamlessly utilize the new CMake-based build backend
  • Review code from team members regarding build system changes
  • Ensure the new build system reliably produces working binaries across supported platforms and complex configurations

Requirements

  • Senior experience in architecting and implementing complex software build systems
  • Expert-level knowledge of modern CMake, specifically in cross-compilation environments for embedded systems
  • Strong expertise in Python development
  • Deep understanding of embedded toolchains (compilers, linkers, sysroots) and vendor SDKs, particularly Espressif IDF
  • Experience with Git and GitHub
  • Professional Fluency in English: Excellent written and verbal communication skills in English

Nice to have

  • A passion for smart homes and automation
  • Experience as an ESPHome user
  • Previous experience contributing to, or deeply analyzing the internals of, PlatformIO
  • Experience with C/C++ package management design concepts (e.g., Conan, vcpkg)
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