Sebastian Reimers developed a targeted user provisioning feature for the TUM-DSE/doctor-cluster-config repository, focusing on automating secure cluster access for new students. He implemented a system to create and manage user accounts, including setting up home directories, login shells, unique user IDs, allowed hosts, and SSH keys, all using Nix for reproducible configuration. This work leveraged his skills in DevOps, system administration, and user management to streamline onboarding and ensure compliance with access policies. The feature addressed the need for scalable, auditable student onboarding, with clear traceability in the commit history, reflecting a focused and well-scoped engineering contribution.