Staff Software Engineer (on-site)

About the role

We're looking for a Staff Software Engineer to join our Berlin team: someone who helps set technical direction, raises the bar across the engineering org, and solves the problems that others escalate. You'll report to our CTO and operate across squads. From your first week, your decisions will be shaping systems that reach thousands of installer partners directly.

What you'll do

• Set technical direction and lead complex, cross-functional initiatives end-to-end: architectural decisions across APIs, infrastructure, and data systems through to production and long-term ownership.
• Identify systemic weaknesses before they become incidents. Design systems that self-monitor, degrade gracefully, and recover fast.
• Own and evolve our backend and frontend systems (Node.js, Next.js, React, TypeScript). Design APIs that are scalable, secure, and easy to build on.
• Model, optimise, and operate our PostgreSQL data layer: schema design, indexing, query optimisation, and migrations that ship safely.
• Architect and manage cloud infrastructure on Google Cloud Platform using Terraform, keeping environments consistent, auditable, and built for the scale we're heading toward.
• Integrate and harden authentication and authorisation flows on Auth0 (OAuth, SSO, session and token management) across the platform.
• Champion AI tooling across the engineering team: not just using it yourself, but defining how we build with it.
• Mentor junior engineers, develop technical leads, run architecture reviews, and shape how we hire and evaluate engineering talent.

What you'll need

• 10+ years of professional software engineering experience, operating as a Staff or Senior engineer — leading initiatives, not just executing them.
• Deep experience building high-stakes systems where reliability and correctness matter more than raw scale.
• Strong JavaScript and TypeScript across frontend and backend. Comfortable across the full stack and opinionated about quality.
• Cloud infrastructure depth, ideally on Google Cloud Platform, with hands-on Terraform or equivalent IaC practice at production scale.
• Strong relational database expertise: schema design, indexing, query optimisation, and performance tuning at scale.
• Based in Berlin. We're intentionally office-first — decisions get made in real time, prototypes get stress-tested over lunch, and the founding team is ten meters away.
• Fully proficient in English (C2).

Nice to have

• Deep knowledge of auth protocols: OAuth, OpenID Connect, SSO, session management. You've built this, not just consumed it.
• German language skills.

What they offer

• Strong base, bonus tied to outcomes, and meaningful equity.
• Unlimited enterprise-grade AI — no caps, no approval process.
• 25 days vacation and Urban Sports Club (M) membership.
• Free breakfast and dinner, stocked kitchen, and regular team events.
• Prenzlauer Berg office with the latest Apple hardware and company discounts.