SlipstreamJobs tracks this role from the company's public career site. Apply directly on the employer's site.
Taxfix is a fintech company that helps millions of people file taxes confidently and claim refunds. Operating across Germany, Spain, and the UK with over 400 professionals, the company has facilitated €3.5 billion in tax refunds since 2016.
As a Staff Software Engineer, you will build core features for the flagship product, transforming complex tax scenarios into simple, reliable user experiences. This is a hands-on role with a builder-first mindset: you'll stay close to customer problems, leverage AI and modern engineering tools to move quickly from idea to impact, and take ownership of outcomes.
You will work in a cross-functional team, bringing deep expertise in either frontend or backend engineering while collaborating effectively across the full stack. Your responsibilities include:
- Partner with product, design, and engineering to understand customer problems, shape pragmatic solutions, and deliver measurable outcomes
- Own work end-to-end: discovery, technical design, implementation, release, monitoring, and iteration
- Turn ambiguity into action, make sound trade-offs, and deliver valuable increments without compromising long-term maintainability
- Contribute to technical direction and strategy supporting the long-term product vision
- Use AI-assisted development tools daily to accelerate exploration, implementation, testing, debugging, and documentation while maintaining high standards
- Critically evaluate and troubleshoot AI-generated output, using effective prompting and appropriate safeguards
- Share AI-assisted development practices and help teammates improve their use of AI tools
- Improve developer experience through tools, automation, and engineering practices enabling reliable, frequent delivery
- Collaborate across product and platform teams, fostering an environment where people learn, grow, give constructive feedback, and raise challenges safely
Taxfix offers 30 annual vacation days, flexible working hours, work-from-abroad opportunities (up to 6 weeks/year), employee stock options, free mental health coaching, yoga, a monthly wellness allowance, free tax filing through the app, and a dog-friendly office.
REQUIREMENTS:
- Professional software engineering experience with React and Node.js; React Native experience is a plus
- Ability to work effectively across system boundaries and collaborate with engineers outside your primary specialism
- Proficiency using AI-assisted development tools in daily work while maintaining high engineering standards
- Ability to evaluate and troubleshoot AI-generated output, use effective prompting, and share practical learnings
- Experience with public cloud environments (Google Cloud, AWS, or Microsoft Azure)
- Familiarity with DevOps concepts and practices: CI/CD, observability, production software operation
- Understanding of core application and backend concepts: authentication, databases, distributed systems, cloud infrastructure, API integrations
- Builder-first, pragmatic approach: turn customer problems into shipped outcomes, take initiative, test and learn quickly, make clear trade-offs between speed, quality, maintainability, and risk
- Passion for writing maintainable, elegant code and continuously improving how software is built
- Collaborative, positive attitude with willingness to challenge ideas constructively
- Builder mindset: thrive in environments still taking shape, take initiative to move ideas forward, create impact even when the path isn't fully defined
- Embrace trying things out over waiting for perfect conditions, ship early to learn fast, treat iteration as progress
