Linux Systems Engineer (100%)

About Threema

Threema is the world’s best‑selling secure messenger for both private users and businesses. Since 2012, we have been working tirelessly to ensure that our users can communicate freely without worrying about their privacy. Our growing user base includes millions of private customers and thousands of businesses and organizations from all over the world.

Your Role

As a systems engineer in the operations team, you will operate and monitor the Threema services and help build the infrastructure behind them. Your work keeps our systems secure, reliable, and scalable – protecting the privacy of millions of people. Our infrastructure is built on open source technologies, and we expect you to feel at home in this ecosystem.

Your Tasks

• Maintenance of a virtualization environment (Proxmox) and administration of virtual servers
• Administration of Linux‑based systems (RHEL); FreeBSD knowledge is a plus
• Operation, maintenance and further development of our infrastructure (services, networking, monitoring and alerting)
• Deployment and maintenance of containerized applications
• Management of our CI/CD infrastructure (GitLab CI) in collaboration with our developers
• Participation in 7×24 on‑call duty

Your Skills

Technical Experience

• At least 5 years of professional experience in a similar role
• Experience with server virtualization
• Expertise in IT security (VPN, firewall, system hardening, etc.)
• Experience with installation, configuration, and troubleshooting of Linux‑based systems
• Knowledge of automation and config‑as‑code solutions
• Experience with monitoring solutions
• Experience with OCI containers (Docker, Podman) and ideally experience with container orchestration
• Experience with databases such as MySQL or PostgreSQL is a plus
• Experience with managing CI/CD infrastructure (especially GitLab CI) is a plus

Soft Skills

• High level of awareness with regards to IT security and privacy
• Strong sense of responsibility and attention to detail
• Willingness to learn new technologies and concepts
• Good written and spoken German and English (at least B2)

We are also happy to accept applications from people who meet many but not all of these criteria.

What We Offer

• A young, motivated team with straightforward communication
• Flexible working hours, option to work from home up to two days per week
• Option to work from anywhere for two weeks per year
• Option to take unpaid leave
• You can choose your own hardware (macOS or Linux)
• Public transportation discount or parking space (electric car charging available)
• Free use of fitness room, including a fitness trainer once a month
• Professional massage once a month
• Internal German or English courses
• A great coffee machine ;)
• Regular company events and aperitifs
• The good feeling of contributing to the effective protection of the privacy of millions of people

Place of work

Pfäffikon SZ (Greater Zurich Area)

Start date

Immediately or by agreement

We believe that diverse teams build better products. We welcome and encourage applications from people of all gender identities and expressions, backgrounds, and perspectives. Your unique experience is an asset, and we’d love to hear from you.