Senior Product Security Engineer

Crusoe is on a mission to accelerate the abundance of energy and intelligence. As the only vertically integrated AI infrastructure company built from the ground up, we own and operate each layer of the stack — from electrons to tokens — to power the world's most ambitious AI workloads. When you join Crusoe, you join a team that is building the future, faster. We're in the midst of the greatest industrial revolution of our time. The demand for AI compute is boundless, and power is a bottleneck. We're solving that — with an energy-first approach that makes AI infrastructure better for the world and faster for the people innovating with AI. We're looking for problem-solving, opportunity-finding teammates with a sense of urgency, who believe in the scale of our ambition and thrive on a path not fully paved — people who want to grow their careers alongside a team of experts across energy, manufacturing, data center construction, and cloud services. If you want to do the most meaningful work of your career, help our customers and partners advance their AI strategies, and be part of a high-performing team that believes in each other, come build with us at Crusoe. About This Role Crusoe is building the infrastructure for the next era of AI and high-performance computing; and we're looking for someone to make sure it's built securely from the ground up. As part of the Product Security team, you won't just be securing the future, you'll be building it, working closely with engineering teams, shipping production code, designing secure architectures, and creating the security foundations that protect our platform at scale. This is a high-impact role where you'll shape how security is practiced across the company, not by saying "no," but by making the secure path the easy path. We're seeking a Senior Product Security Engineer who is first and foremost a skilled software engineer with AI expertise. You'll design secure systems, build security controls that integrate seamlessly into developer workflows, and help raise the security bar across our AI infrastructure and distributed systems, all while maintaining a pragmatic, delivery-focused mindset. What You’ll Be Working On - Design and build secure frameworks and patterns for high-performance AI workflows, agents, and models to protect our clients - Create reusable security patterns for product microservices, focusing on service-to-service authorization, API security, and multi-tenant data isolation that scales across product lines - Create developer-facing tools and automation that catch security issues early in the development cycle without slowing teams down - Perform security reviews, penetration tests, code reviews, and system design reviews for Crusoe’s fleet of SaaS offerings. What You’ll Bring to the Team - 7+ years of experience shipping production software with strong system design skills - Deep expertise in Golang and Node.js/JavaScript, with experience building and debugging distributed systems Hands-on experience securing gRPC services, REST APIs, and microservice architectures - Strong background implementing authentication and authorization systems using OAuth2, OIDC, SAML, JWT, and RBAC/ABAC models - Production experience with application security tooling (SAST, DAST, SCA) and CI/CD integration (e.g., Semgrep, OWASP ZAP, Burp, GitLab) - Knowledge of runtime application security and observability tools - Solid understanding of cloud-native and containerized environments (Docker, Kubernetes) and network security fundamentals - Strong grasp of OWASP Top 10, secure coding practices, cryptography, and secure design principles Bonus Points - Experience building reusable security frameworks or internal developer platforms - Background in platform or infrastructure-adjacent security engineering - Experience influencing security practices across multiple engineering teams - Familiarity with supply chain security and dependency risk management Benefits: - Competitive compensation - Res