Senior Rust Engineer based in Lüdinghausen, Germany. 13+ years of software engineering, focused on open-source Rust toolchain for the lighting and BIM industries.

Each core crate ships from a single Rust source tree to multiple ecosystems: Rust (crates.io, 28k+ downloads), Python (PyO3 / PyPI, 200k+ downloads), Swift and Kotlin (UniFFI), Flutter, and WebAssembly. The same Rust core powers the web showcases and the Apple apps.

• gldf-rs — reference Rust implementation of the international GLDF standard for photometric lighting data · github · crates.io · PyPI

• eulumdat — legacy EULUMDAT format with cross-platform bindings · github · crates.io · PyPI

• l3d-rs — L3D format support (used as GLDF 3D model input) · github · crates.io · PyPI

• bimifc — IFC parsing and BIM viewer core with integrated lighting visualization · github · crates.io · PyPI

• bimifc.de — BIM viewer based on the bimifc crate
• gldf.icu — GLDF browser toolkit based on gldf-rs
• eulumdat.icu — EULUMDAT toolkit based on eulumdat
• iesna.eu — photometric tools and virtual goniophotometer
• acadlisp.de — AutoLISP REPL in Rust + WASM (7,300+ downloads)

App Store-distributed. The Rust libraries powering these apps are actively maintained; app releases follow as needed.

• geodb — offline geolocation lookup based on geodb-rs. Native iOS, iPadOS, watchOS, and tvOS.
• gldf — photometric data viewer for iOS and macOS, built on gldf-rs. App release lags the Rust library.
• eulumdat — EULUMDAT data viewer for iOS and macOS, built on eulumdat. App release lags the Rust library.
• RoomPlan Simple — LiDAR room scanning for iOS with multi-format export (STL, USDZ, DXF, IFC via embedded bimifc — enabling full IFC rendering, not just conversion), position-tagged photo capture (rendered into the 3D model), and live WiFi strength heatmap generated during the scan.

• Bevy Engine — Rendering Core PRs (#23436 partial bindless on Metal, #23439 GPU clustering), RFC #23480 for photometric rendering, with endorsement from core contributor mate-h
• Burn — Metal backend optimizations for Apple Silicon
• CubeCL — wgpu command encoder, WASM poll gating (#1204)
• Various OSS projects — accepted PRs to Pillow, Leptos, Synphonyte, diesel_cli_ext, and others

Rust · WebAssembly · Bevy · wgpu · Apple Metal · Leptos · Axum Cross-Platform Bindings (PyO3, UniFFI, Flutter) · watchOS · tvOS Computer Graphics · Photometric Engineering · BIM/IFC · Lighting Industry Standards

• Rusterando — AGPL self-hostable restaurant delivery platform in pure Rust (Leptos + Axum + SQLite + Stripe + APNs + Typst). Demo at rusterando.de.

• geodb-rs — offline geolocation library in Rust, with Python and Flutter bindings. Live demo and benchmark at trahe.eu/geodb-rs.html. · github · crates.io · PyPI · Flutter

• trahe.eu — main site
• crates.io/users/holg — Rust crates
• pypi.org/user/holg — Python packages
• github.com/holg — all repositories

If your team uses any of my crates in production — whether through crates.io, PyPI, or WebAssembly — or you find value in standards-level work for GLDF/EULUMDAT/photometric formats, consider sponsoring me on GitHub. Every sponsorship directly supports continued maintenance and new development.