Security Engineer

ABOUT US: Modal provides the infrastructure foundation for AI teams. With instant GPU access, sub-second container startups, and native storage, Modal makes it simple to train models, run batch jobs, and serve low-latency inference. We have thousands of customers who rely on us for production AI workloads, including Lovable, Scale AI, Substack, and Suno. We're a fast-growing team based out of NYC, SF, and Stockholm. We've hit 9-figure ARR and recently raised a Series B https://modal.com/blog/announcing-our-series-b at a $1.1B valuation. Our investors include Lux Capital https://www.luxcapital.com/, Redpoint Ventures https://www.redpoint.com/, Amplify Partners https://www.amplifypartners.com/, and Elad Gil https://eladgil.com/. Working at Modal means joining one of the fastest-growing AI infrastructure organizations at an early stage, with many opportunities to grow within the company. Our team includes creators of popular open-source projects (e.g. Seaborn https://github.com/mwaskom/seaborn, Luigi https://github.com/spotify/luigi), academic researchers, international olympiad medalists, and experienced engineering and product leaders with decades of experience. THE ROLE: We’re looking for a hands-on Security Engineer to help with building, operating and securing Modal’s low-level systems and infrastructure. This role involves close partnership with engineering to drive projects across AppSec, CloudSec, Detection and Response, and Compliance. REQUIREMENTS: - 5+ years building and operating security controls or tooling in production systems (ideally at a cloud/SaaS or developer platform) - Proficiency in at least one of: Python, Go, or Rust - Strong fundamentals in systems and networking - Experience with modern cloud security: IAM design, VPC/networking, container security, Kubernetes - Depth in at least two security domains (e.g., AppSec, CloudSec, Detection & Response, Identity Management, GRC or Offensive Security) - Comfortable owning the full lifecycle: threat modeling, secure design reviews, code/infra reviews, vulnerability management, and partnering with engineers to land fixes - Clear communication, product sense, and high empathy for developer productivity - Ability to work in-person in our NYC office