Senior Software Engineer

About the role

You'll work across the full stack of a genuinely complex, physical-digital product. That means backend services, frontend interfaces, mobile experiences, database design, operational tooling, and occasionally hardware. Senior means senior: you'll take real technical responsibility for meaningful parts of the product, make decisions, and ship things that members and coaches interact with every day.

What you'll do

• Own and deliver end-to-end solutions to complex, ambiguous problems across the product from scoping through to production
• Make sound architectural decisions independently, and advocate for them clearly with your team and stakeholders
• Contribute to frontend, backend, infrastructure, and wherever else the work takes you without needing a specialist for every context
• Mentor and actively grow the engineers around you, raising the technical capability of the team as a whole
• Bring technical insight early into product discovery, and collaborate closely with Product and Design to shape what gets built
• Champion quality, observability, and production reliability as non-negotiables
• Help evolve our engineering practices and tooling, and drive improvements that make the whole team faster and better

What you'll need

• A strong generalist with proven experience across the full stack — you're comfortable in backend, frontend, databases, and ops, and you don't wait for someone else to handle the unfamiliar parts
• Sharp engineering judgement: you make good decisions under ambiguity, validate them with data, and communicate trade-offs clearly
• A genuine product engineering mindset — you think about outcomes, not just outputs, and you care about the members and coaches using what you build
• Experience working in complex, real-world systems where reliability and performance actually matter
• Comfort with AI-assisted development, and the discipline to own everything you ship with it
• Someone who raises the bar around them through code quality, documentation, mentorship, and how you show up in a team

Nice to have

• Experience with Elixir, LiveView, or React Native

What they offer

• Unlimited BEAT81 workouts for you and one other person, plus membership to John Reed Berlin Bötzow
• Flexible working hours
• Professional development budget for courses, workshops, and certifications
• Access to Meditopia and 7Minds platforms for wellness
• Private company pension plan partnership with Stuttgarter Versicherung
• Free drinks, fresh fruit, coffee, and snacks in the office