Interim Staff Systems Engineer - IT & Infrastructure

The opportunity

As our Staff Systems Engineer within the IT & Infrastructure team, you'll be responsible for keeping the enterprise systems that power Taxfix running reliably, securely, and intelligently — from cloud infrastructure and identity management to network, device, and application performance. Reporting to our Director of IT & Infrastructure, and collaborating closely with cross-functional stakeholders across the business, you'll architect and operate the backbone that enables every team at Taxfix to do their best work. In a company that moves fast and thinks big, you'll be the person who makes sure the foundation never wobbles.

This is an interim position on a freelance basis.

Your responsibilities

• Maintain and operate enterprise cloud infrastructure that serves employees and internal systems, ensuring high availability, performance, and security at all times.
• Lead and evolve identity management across the enterprise — including platform management and Okta — developing concepts and processes to govern both human and agentic identities in a scalable, secure way.
• Support the integration of new tools and systems based on business requirements, owning the technical evaluation, onboarding, and configuration end to end.
• Ensure enterprise systems remain up to date, with security configurations, patches, and compliance standards consistently applied across the board.
• Maintain security backups and redundancies for enterprise infrastructure, proactively identifying and closing gaps before they become incidents.
• Manage and improve network, device management, and systems, keeping the environment stable, modern, and fit for a growing, hybrid workforce.
• Develop automations, AI-powered and agentic solutions, and scripts that reduce manual toil and improve the efficiency of infrastructure maintenance.
• Provide third-level support for cloud applications, acting as the deepest technical escalation point for complex issues and enablement of internal app deployment.
• Collaborate with SRE and platform engineering to assess risk, develop guardrails, and resolve incidents together with application owners.
• Collaborate with the Director of IT to continuously improve the enterprise architecture and infrastructure landscape, contributing strategic thinking alongside hands‑on execution.
• Own performance tuning of application stacks, including communication and messaging between applications, load management, and components such as Apache and Ruby.

Your profile

• You bring strong, hands‑on experience in enterprise cloud administration — ideally with GCP — and know how to design, operate, and scale cloud environments that real businesses depend on.
• You have solid practical experience with Kubernetes, containerisation, and virtualisation technologies such as Docker and VMware, and you're comfortable navigating complex, layered infrastructure.
• Your networking knowledge is deep and grounded — TCP/IP and related protocols are second nature to you, and you can diagnose and resolve network issues with confidence.
• You implement best practices for network security and governance, ensuring that access, segmentation, and policy controls are consistently applied and continuously improved.
• You're proficient in at least one scripting or programming language such as Python or shell, and you use code as a tool to make infrastructure smarter and more maintainable.
• You have hands‑on experience configuring and troubleshooting Google Workspace and Linux environments, and you know how to keep them healthy and secure.
• You've set up and improved monitoring and visualisation systems, and you understand how good observability translates into faster incident response and better decision‑making.
• A background in engineering or computer science is a plus — what matters most is that you bring structured thinking and hands‑on experience to make systems work together.

Why Taxfix?

• A chance to do meaningful, people‑centric work with an international team of passionate professionals.
• Holistic well‑being with free mental health coaching sessions.
• A monthly allowance to spend on an extensive range of services that you can use and roll over as flexibly as you like.
• Employee stock options for all employees—because everyone deserves to benefit from the success they help to create.
• 30 annual vacation days and flexible working hours.
• A generous learning budget to support your personal and professional development and guidance from our internal L&D experts.
• Work from abroad for up to six weeks every year. Just align with your team, and then enjoy your trip.
• Plenty of opportunities to socialise as a team. In addition to internal meetups, our international team hosts regular get‑togethers—virtually and in person when possible.
• Free tax declaration filing, of course, through the Taxfix app—and internal support for all personal tax‑related questions.
• Have a four‑legged friend in your life? We're happy to have dogs join us in the office.

Location: Berlin
Employment Type: Full time
Location Type: Hybrid
Department: Corporate IT