Senior Security Engineer

About Kestra Kestra is the universal orchestration platform : open source, declarative, and designed to orchestrate data pipelines, IT automation, business workflows, and AI/agentic systems. Trusted by over 10,000 organizations worldwide , including JPMorgan Chase, Bloomberg, FILA, and Crédit Agricole , Kestra orchestrates mission-critical workloads at scale. The open-source project has close to 30,000 GitHub stars , hundreds of contributors, and a fast-growing global community. About the role 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. What you would do 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. Our Tech Stack • Security & Vulnerability Tools : Trivy, GitHub Security / Dependabot, Elastic Security • Infrastructure : Docker, Kubernetes, Terraform • Cloud : GCP • Programming language : Java, Typescript, Javascript • Datastore : PostgreSQL, Elasticsearch • Queuing : Redis, Kafka, AMQP • Monitoring & Logs : ELK, Prometheus, Grafana • Deployment & Repository : GitHub Actions, ArgoCD What we are looking for • 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 : You don't just export scanner PDFs; you can read code, understand exploits, write fixes, or provide clear remediation steps to engineers. • Deep familiarity with cloud security (AWS or GCP) and containerized environments ( Kubernetes , Docker). • Experience with dependency and supply-chain security (CVE management, open-source licensing, SCA tools). • Fluent in English and comfortable working autonomously in a fully remote environment. • Adaptability to a fast-paced open-source startup environment where pragmatism and execution speed matter. Perks & Benefits • Work from anywhere : We’re a remote-first company, so you can work from wherever feels like home. Plus, you’ll have access to coworking spaces worldwide if you ever need a change of scenery. • Health coverage : From medical support, dental, and vision, we've got you covered. • Home office setup on us : We’ll provide all the equipment you need to work comfortably.   Our Hiring Process We aim to move quickly (2-3 weeks), but we can adjust the timeline if needed. • Intro call with the hiring manager (30 min) • Technical scenario / Practical assessment (2 hours, asynchronous homework focusing on threat assessment and remediation) • Team chat with one of your future colleagues (30 min) • Final discussion with one of our co-founders (30 min) Find more English Speaking Jobs in France on Arbeitnow