(Senior) Software Engineer – Backend (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. Your challenge As a (Senior) Software Engineer on the TaxCore team, you'll be part of a shared engineering team that serves both Taxfix and Steuerbot - one team, two brands, multiple products. Based in Berlin or Stuttgart with a flexible hybrid setup, you’ll build and evolve the core shared services that power core experiences across both brands. In close collaboration with other teams, you'll design scalable backend systems and help shape technical direction as part of a small, high-ownership team that moves fast without cutting corners. This is a role for someone who loves building things that matter - and who takes genuine pride in the craft of doing it well. Your responsibilities Build, maintain, and continuously improve core shared services and internal tools that power stable, intuitive user experiences for both Taxfix and Steuerbot. Design and implement scalable, reliable backend systems and architecture that enable core functionality across Taxfix and Steuerbot. Collaborate across teams to design, ship new features and share capabilities, working pragmatically beyond the boundaries of your immediate team. Contribute to shaping the long-term technical direction of core backend services, bringing both depth of expertise and a pragmatic, outcome-focused mindset. Contribute across the team’s stack, including occasional frontend work on internal tooling. Take ownership, remove blockers, and help the team stay focused on what matters most. Your profile You bring strong backend engineering experience and a proven track record of building and evolving complex, scalable systems in production environments. You are highly proficient in at least one modern programming language, and experience with Go is strongly preferred. You have solid experience with modern software architecture concepts, including API design, databases, and cloud-based systems - and hands-on experience integrating a diverse range of third-party and internal APIs. You are comfortable with containerization and DevOps concepts, with practical experience using tools like Kubernetes. You care deeply about code quality - writing performant, maintainable, and elegant code is something you take genuine pride in, and you have a natural affinity for the full stack of what it takes to ship great software. You are familiar with AI-assisted development tools like Claude Code, and understand how to use them thoughtfully to support better, faster engineering. You’re a pragmatic, hands-on builder: someone who cuts through complexity and enjoys turning ideas into well-crafted solutions. You’re collaborative, direct, and outcome-oriented, and thrive in cross-functional environments where people work closely together to solve problems. German language skills are a plus, as this team works closely with Germany-specific tax logic. 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 and yoga. 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.