Founding Staff / Principal Engineer

**Founding Staff / Principal Engineer** Own product delivery across our SaaS platform, cloud infrastructure integrations, and developer tools, from customer problem to production. Remote first · Flexible hours · Berlin time zone overlap preferred You must be able to travel to Berlin for work. We do not offer visa sponsorship. **The role** Proofline reviews code changes against the infrastructure they will deploy into. The product connects code, Terraform and cloud configuration, and deployment evidence so engineers can investigate failures before a change reaches production. You will own core SaaS architecture and ship product workflows end to end, working directly with our founder, Mohsen Azimi. The role starts as a hands-on principal individual contributor, writing and reviewing code, with a path to grow and manage the engineering team as the company scales. You will move fluidly between systems design, product decisions, and implementation. That could mean building out a multi-tenant SaaS workflow, tracing a failed cloud connection, resolving how a Terraform change interacts with live AWS permissions, improving a review's explanation, or debugging a database bottleneck. You use AI coding agents heavily to multiply your output, and you stay responsible for the quality and reliability of the result in production. Read about how we work and what we offer. **What you will own** * **Build out the core SaaS application.** Own complete customer workflows from connecting a GitHub repository and cloud environment, to running asynchronous reviews, inspecting evidence in the web console, and managing organization and access boundaries. * **Develop deep Terraform and cloud infrastructure integrations.** Build integrations that reflect how production cloud environments actually operate across AWS and Google Cloud. Handle Terraform state and plans, IAM permissions, networking, resource discovery, changing cloud state, and partial API responses, and make configuration failures immediately understandable to the user. * **Turn customer problems into focused releases.** Talk directly to the engineers using Proofline, reproduce the friction they encounter, choose a pragmatic scope, and carry the change through design, implementation, verification, and rollout. * **Improve the developer tools and API experience.** Build capabilities that fit naturally into the CLI, SDKs, editors, and GitHub workflows, with clear contracts, useful errors, and considered compatibility. * **Improve review quality through reproducible evaluation.** Investigate unsupported findings, missed failure scenarios, and incomplete reviews. Use concrete production cases to guide changes in our AI review pipelines and verify their effect. * **Own reliability, performance, and operating cost.** Investigate slow reviews and failed jobs, understand database and cloud provider bottlenecks, and make measured improvements without weakening evidence or tenant isolation. * **Set the engineeri