Holger Trahe
Senior Systems Architect & Rust Engineer
Senior Rust Engineer building production toolchains for lighting (GLDF, EULUMDAT, L3D, TM-25) and BIM/IFC. 60 crates on crates.io, 8 PyPI packages, bindings for Python, WASM, Swift/Kotlin, PHP and Java. Latest: firmware that runs on the chip and in the browser, AutoLISP scripting in the GLDF and IFC editors, and HL7/DICOM tooling.
Services
Rust Libraries
Workspace-scale Rust libraries with cross-platform bindings — Python (PyO3/maturin), WASM, Swift/Kotlin (UniFFI), Java (JNI), PHP.
Lighting & BIM Tooling
Photometric & BIM toolchains: GLDF, EULUMDAT/LDT, IES, L3D, IFC. Parsers, validators, viewers, ray tracers, report generators.
iOS / watchOS / macOS
Native Apple platform apps leveraging Swift and Rust cores via UniFFI.
WebAssembly
Browser-native apps with Leptos + Bevy + WebGPU, plus complex C++/Qt to WASM ports.
Python Web Backends
Django & Flask expert since the early days. REST APIs, ORMs, production deployments.
Projects
eulumdat ecosystem
Photometric file toolchain (EULUMDAT/LDT + IES) — parser, validator, CLI, TUI, cross-platform egui GUI, Bevy 3D viewer, WASM editor, Windows preview handler, Typst report generator, and (WIP) wgpu ray tracer for virtual goniophotometry. ~20 crates, all at v0.7.0. 8,500+ crate downloads, 56k+ PyPI downloads.
gldf-rs
Complete GLDF format implementation in Rust with cross-platform bindings — now at v0.4.0 with egui desktop viewer, UniFFI for iOS/macOS/Android, and an expanded search/index workspace. The editor is scriptable in AutoLISP and also runs as a terminal app (ratatui). 17k+ crate downloads, 49k+ PyPI downloads.
gldf-search
Deterministic, in-process search/index for GLDF luminaire catalogs. Delivers product-discovery workflows previously requiring heavyweight commercial photometric/lighting infrastructure — orders of magnitude faster, using a small fraction of the resources. 6-crate workspace (schema, index, extractor, CLI, server, Leptos UI), all at v0.1.0 — actively evolving from a linear-scan reference implementation toward fst+roaring-bitmap indexes. 760+ crate downloads.
l3d-rs
L3D (Luminaire 3D) file format parser with transformation matrices for WASM/WebGL rendering. Now includes egui desktop viewer and UniFFI bindings for iOS/Android. 2,900+ crate downloads, 147k+ PyPI downloads.
tm25ray
Reader and writer for IES TM-25 ray files: zero-copy ray views, vendor quirks handled bit-exactly, about 91 M rays/s decoded. Feeds the WebGPU viewer and virtual goniometer on iesna.eu. 30 crate downloads.
Greenhouse Console
SCADA in a browser tab for TRAHE SYSTEMS: live mimics, alarms, trends, MQTT — and a DALI gateway reached over USB (WebSerial). The gateway logic is one pure Rust crate shared by the browser, an ESP32-C6 and an STM32.
geodb-rs
World city database in Rust: flat DB and search blobs, a WebGPU globe that starts at 274 KB, and Embassy firmware for the STM32F769I-DISCO whose same code runs in the browser as WebAssembly. Workspace: core, CLI, WASM, Python, firmware. 3,000+ crate downloads, 11k+ PyPI downloads.
bimifc
Pure Rust IFC parser and viewer for BIM applications. Browser-native viewer using Leptos UI + Bevy 3D with WebGPU/WebGL2 rendering, plus a ratatui-based TUI for headless inspection. 8-crate workspace, all at v0.2.0. Includes an AutoLISP REPL that writes IFC models in the browser. 2,900+ crate downloads, 15k+ PyPI downloads.
acadlisp
AutoLISP interpreter and mini-CAD engine in Rust/WASM — the 1991 CSV → template → schematic workflow, revived, with DXF R12 and KiCad export. Also the scripting engine inside the GLDF and IFC editors. 220+ crate downloads.
Background removal (Burn)
U²-Net background removal compiled to WebAssembly with Burn: WebGPU by default, a CPU fallback, the weights inside the binary — the image never leaves the page.
dicomscope
DICOM meets HL7 v2 in the browser: a CT study and its HL7 order read locally, linked by Study Instance UID and accession number, mapped to FHIR — no upload, auditable no-network build. Built on hl7kit.
hl7kit · mwlkit
HL7 v2 parsing with byte spans for every field, and HL7 imaging orders turned into DICOM worklist items. Rust crates with Python bindings; the engine behind dicomscope. 50 crate downloads, 1,700+ PyPI downloads.
z-image-burn
Rust port of the Z-Image generative model using the Burn deep learning framework — exploring on-device, GPU-portable inference.
scopekit
ratatui viewers with live wgpu views — in any terminal (kitty, iTerm2, sixel or half blocks) or in their own window, from the same UI code. 17 crate downloads.
Rusterando
Delivery and order platform in Rust — cook food, keep margins. Full-stack experiment in pragmatic SaaS architecture.
Wuhan-Trans
On-device voice translator for iOS/macOS — Chinese / English / German + 23 languages. Uses WhisperKit for transcription, Apple Translation, and MultipeerConnectivity for peer-to-peer pairing.
RoomPlanSimple
iOS LiDAR room scanning app that creates USD 3D models — with IFC export for BIM workflows, bridging on-device AR capture into the same pure-Rust IFC pipeline used by bimifc. Published on the App Store.
bitcoin_de
Rust implementation of the Bitcoin.de Trading API v4. 1,300+ crate downloads.
TinyTwilioStripe
Compact Rust backend for Twilio Video/Audio calls with optional Stripe payments. 3,100+ crate downloads.
Burn & CubeCL (Contributor)
Fixes merged upstream while running models in the browser: staging-buffer flushing in CubeCL's wgpu runtime, and a dtype match in burn-candle.
Let's Work Together
Based in NRW, Germany. Available for remote consulting worldwide.