Tobias von Arx
Tobias von Arx

Hey! I'm a Data Science Master's student at ETH Zurich; currently visiting the University of Cambridge. I'm interested in machine learning, security, and language models. I've worked on LLMs + security at the ETH SRI Lab and at UBS, pretraining and memorization dynamics with the ETH AI Center, and applied machine learning across oncology, geospatial, and energy.

I'm always happy to discuss interesting ideas, please reach out.

tobiasvonarx [at] proton [dot] me
CV, LinkedIn, GitHub, and X.

Research

AutoBaxBuilder: Bootstrapping Code Security Benchmarking Tobias von Arx, Niels Mündler, Mark Vero, Maximilian Baader, Martin Vechev ICML 2026

Agentic generation of web-backend security benchmark tasks with functional tests, contrastive exploits, and an executable benchmark release.

Memorization Dynamics of Fill-in-the-Middle Pretraining Tobias von Arx*, Tanguy Dieudonné* (*equal contribution) MemFM @ ICML 2026

Controlled 100B+ token pretraining experiments, studying FIM vs. left-to-right memorization through probabilistic extraction and attention patterns.

Writeups