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

Our story:

Every year millions of people are either filing their taxes in fear or giving up on their tax refund altogether. We're working on fixing that. Our intuitive app enables anyone, regardless of education or background, to file their taxes with newfound confidence.

Spread across Germany, Spain and the UK, the team at Taxfix Group with its brands Taxfix and Steuerbot, is a compassionate group of solution-finders. We speak our minds openly, and with over 400 professionals, including tax experts, developers, and IT security experts, we're rich in ideas and voices. The group has facilitated more than 3.5 billion euros in tax refunds for its customers since its founding in 2016.

The opportunity (Interim/Freelance basis):

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.

Excited? So are we. Learn more about Team Taxfix on our blog and get a glimpse of our culture.

At Taxfix, we believe that incredible things happen when you have a wealth of perspectives and experiences. We're proudly committed to equal employment and development opportunities no matter your gender, race, religion, age, sexual orientation, colour, disability, or place of origin. To help mitigate any potential unconscious biases, we ask that you refrain from including your picture, age, or marital status on your CV. Let your experiences speak for themselves.

Not sure if you meet all the requirements for this role? Please apply anyway. You might bring something special to the team that we hadn't considered previously.

Please note: This role is offered on an interim/freelance basis.