Responsibilities include:

• Design, implementation, and maintenance of our public cloud infrastructure based on Proxmox and Ceph
• Design, implementation, and maintenance of various high-availability e-commerce platforms for our customers
• Administration of the email platform (SMTP, IMAP, DKIM, SPF, DANE)
• Administration of the data center and various networks (OSI layers 1-7)
• Administration of the edge routers and firewalls (BGP, OSPF, PPTP, etc.)
• Administration of SiSeNet – Siemens’ Alarm-over-IP carrier network
• Design, implementation, and maintanance of an email account takeover detection and prevention system
• Design, implementation, and maintenance of an automation and configuration-management toolchain based on Ansible
• Participation in 24/7 on-call rotation
• Provide customer support

Responsibilities include:

• Maintenance and expansion of the HPC for Charité Berlin
• Administration of the networks, switches, routers, and firewalls
• Design, implementation, and maintenance of various storage backends based on Ceph and ZFS
• Administration of the SLURM cluster
• Provide customer support

Responsibilities include:

• Design, implementation, and maintenance of an automation and configuration-management toolchain based on Ansible
• Participation in 24/7 on-call rotation
• Provide customer support

Responsibilities include:

• Automating AWS infrastructure based on Chef

Responsibilities include:

• Ensure operational continuity of the hosting infrastructure
• SysAdmin Team-Lead
• Spearhead the establishment of mailbox.org (in response to the revelations uncovered by the Snowden leaks)
• Implement 2FA for mailbox.org based on FIDO/U2F (Yubikey)
• Present technical talks at various conventions, such as the Chemnitzer Linux Days
• Participate in 24/7 on-call rotation
• Provide customer support

Responsibilities include:

• Administration and expansion of the public cloud based on OpenVZ/Virtuozzo
• Participate in 24/7 on-call rotation
• Provide customer support

Responsibilities include:

• Workstation provisioning and administration
• Back-office administration
• Server administration
• Implementation of continuous deployment based on Git