Job Description

Hands-on Staff / Principal Engineer to own core SaaS architecture, cloud integrations, developer tools, and product delivery, with a path toward engineering leadership. Stack: Rust, Go, PostgreSQL, React/TypeScript, Terraform, AWS, GCP. We’re looking for someone with 10+ years of hands-on infrastructure engineering experience, deep SaaS and cloud expertise, extensive use of AI coding agents, and a track record of shipping end to end. Responsibilities include building and maintaining scalable infrastructure, tooling, and deployments with a focus on reliability and developer productivity. Remote globally, flexible hours, regular Berlin visits required. Salary: €120k-€200k depending on experience and location, plus meaningful founding equity. No visa sponsorship. To apply, ship a small feature PR to one of our open-source developer tools and email careers@proofline.sh with the link. If you have 10+ years of relevant experience and an established online presence showcasing your technical work, you can skip the PR and share your best work with us instead.