Senior Security Engineer

Kestra runs arbitrary, user-defined code at scale. Our users write workflows that execute scripts, containers, and queries against their own production systems, through hundreds of community-built plugins, on a platform whose entire source code is public. That is an unusually rich attack surface, and securing it is a genuinely hard engineering problem rather than a checklist exercise. You would be our first dedicated security hire. We're looking for a Senior Security Engineer to own and elevate the end-to-end security posture of our platform, infrastructure, and open-source ecosystem.

This is a unique, hybrid role for someone who excels at both sides of security: actively breaking systems to find vulnerabilities (hands-on penetration testing) and actively fixing them (opening PRs, patching infrastructure, and managing supply chain risks). If you want to build a world-class security foundation for a fast-growing open-source and SaaS platform, this role is for you. This is a hands-on engineering role, not a GRC or compliance one.

Your first six months would focus on the first three points below. The rest is where the role grows.

• Conduct hands-on penetration testing and threat modeling across our web application, APIs, control plane, and cloud environments.
• Manage end-to-end vulnerability tracking across our codebases, software dependencies (SCA), container images, and cloud infrastructure.
• Proactively fix security flaws by writing patches, submitting Pull Requests (PRs), or collaborating directly with product teams to guide remediation.
• Audit and harden our cloud infrastructure (GCP, Kubernetes clusters, and networking configurations) against external and internal threats.
• Automate security tooling into our CI/CD pipelines (SAST, DAST, dependency scanners) to catch CVEs before code reaches production.
• Perform security code reviews and evaluate third-party dependencies, open-source integrations, and supply-chain risks.
• Lead incident response efforts and establish continuous monitoring, detection, and mitigation strategies.
• Own our public security posture as an open-source project: vulnerability disclosure process, CVE handling, security advisories, and the trust model of our plugin ecosystem.

• 5+ years of experience in Security Engineering, Product Security, DevSecOps, or a combined Offensive/Defensive role.
• Strong hands-on penetration testing background, with proven ability to discover application, API, and network-level vulnerabilities.
• A builder/fixer mindset: