Software engineering student at Hochschule Esslingen, 5th semester. I mostly write backend services in Go and Java/Spring Boot, and I gravitate towards the parts where being wrong is expensive: money, state, things you can't quietly get wrong.

Suche eine Werkstudentenstelle (20 h/Woche) im Raum Stuttgart, idealerweise mit der Option, dort ab Sommersemester 2027 auch das Pflichtpraktikum (ca. 5 Monate) zu absolvieren.

VentoryGo | invoicing backend · Go, Gin, PostgreSQL, Docker

Invoicing service for small businesses. Amounts are stored as int64 cents and VAT as basis points, so no float ever touches the money, and invoices are never deleted — a cancellation writes a credit note, which keeps the books auditable. The document model leaves room for ZUGFeRD/XRechnung output. Sessions use Argon2id with rate limiting on the auth endpoints; PDFs are generated server-side. Unit tests cover the money paths: rounding, VAT calculation, credit notes.

Aktivitätstracker | Android client and Spring Boot backend · Kotlin, Java, Keycloak

Team project for 5 people over one semester. Offline-first: the client writes locally and reconciles through WorkManager, so the app stays usable without network. Auth via Keycloak, CI builds and signs release APKs on tag. I worked on the offline sync between the local and remote database, the statistics feature, and the release pipeline.

mysh | Unix shell · C++

Interactive shell built directly on fork(), exec(), pipe() and dup2(). Pipelines, redirections, signal handling, tab completion. No leaks reported under Valgrind.

Almost daily:

Used in projects: