Interim Staff Systems Engineer - IT & Infrastructure (d/f/m)

Taxfix is looking for an interim Staff Systems Engineer on a freelance basis to join its IT & Infrastructure team and keep the company's enterprise systems running reliably and securely. Reporting to the Director of IT & Infrastructure, you will operate enterprise cloud infrastructure, lead identity management including Okta for human and agentic identities, and manage networks, device management and systems for a hybrid workforce. The role also covers integrating new tools, patching and compliance, backups and redundancy, third-level support for cloud applications, automation and AI-powered tooling, and performance tuning of application stacks such as Apache and Ruby. Candidates need hands-on enterprise cloud administration experience (ideally GCP), practical Kubernetes, Docker and VMware skills, deep TCP/IP networking and network security knowledge, scripting in Python or shell, and experience with Google Workspace, Linux and monitoring systems. The role is based in Berlin with a hybrid setup.