01 / Work

At Herzog.

Railroad Services

CMMS — Enterprise

Full-stack feature work on a maintenance platform spanning invoicing, assets, scheduling, and reporting.

2026

AngularTypeScriptC#.NETSQLAzureRabbitMQ

EBUS — Integrated Systems

End-to-end build of a feature that collapsed two tools into one workflow.

2025

C#WPFWinFormsXAMLC++SQL

EBUS — Integrated Systems

Ongoing maintenance, debugging, and reliability work on a critical internal application.

2025

C#WinFormsWPFC++

GPSTIE — Integrated Systems

Tablet-and-laptop solution for two-operator field work in low-signal environments.

2025

.NET MAUIC#XAML

02 / Private

On the side.

Nights & weekends

SpotSaved — Never lose your car again

iOS app for remembering where you parked. Meter reminder, photo of the spot, walks you back.

Live

2026

A native iOS app built on nights and weekends and shipped to the App Store. Fully offline by design: no accounts, no servers, no tracking. State and photos live on the device, where they belong.

iOSReact NativeExpoTypeScriptZustand

lukassiemers.com — Self-hosted on a Raspberry Pi

This site, designed and built from scratch and self-hosted out of my home.

Live

2026

Next.js portfolio with a typographic editorial feel, blur-in animations on every masthead, and a static-export build so there's no Node runtime to run. Self-hosted on a Raspberry Pi 4 over a Cloudflare Tunnel with no port forwarding, no inbound exposure, TLS terminated at Cloudflare's edge and plain HTTP inside a Docker network. Two containers on the Pi: Caddy serves the built `out/` folder, cloudflared keeps an outbound tunnel open. Updates are one `npm run build` and an `scp -r out` away.

Next.jsTypeScriptTailwind CSSFramer MotionDockerCaddyCloudflare TunnelRaspberry Pi

Zentrum — Safety incident platform

Incident reporting, investigation, CAPA, and recurrence tracking, built end-to-end under a hackathon deadline.

2nd place

2026

Full-stack safety and incident management system: submit reports, run investigations, track corrective and preventive actions, and surface recurrence patterns on a dashboard. Built end-to-end against a hackathon clock for Herzog's Prompt-A-Palooza and placed 2nd. Auth, migrations, testing, and a one-command Docker spin-up all done inside the window.

ReactTypeScriptViteExpressPostgresDrizzlePlaywrightDocker

Graphite — Cross-platform notes

A notetaking app that works the same everywhere I do.

In progress

2026

One notetaking app for every surface I actually use: desktop and mobile, with Apple Pencil drawings and typed text living side by side in the same note and syncing across devices. A shared codebase underneath, and a release pipeline that ships binaries on every push. Still in progress, and the public repo is where the thinking happens.

ElectronExpoReactTypeScriptZustandSupabaseGitHub Actions