[Remote] Security Engineer, Offensive Security

Note: The job is a remote job and is open to candidates in USA. Fluidstack is building its offensive security program to protect its cloud infrastructure, endpoints, bare metal deployments, and data center systems. The Security Engineer will lead red and purple team operations, penetration testing, AI-focused security work, and communicate actionable findings to technical and executive audiences.

Responsibilities

• Build Fluidstack's offensive security program from the ground up, including its methodology, tooling, and engagement cadence
• Run red and purple team operations emulating advanced threat actors across our cloud infrastructure, endpoints and bare metal deployments
• Pen test critical systems, including tenant isolation, bare metal GPU hosts, firmware and BMCs, and data center OT
• Partner with security and engineering teams on AI-specific attack scenarios, including agentic systems and other novel AI-enabled risks
• Contribute to AI-assisted offensive testing tools and workflows
• Present findings to technical and executive audiences as clear, actionable risk that shapes the security roadmap
• Live on the bleeding edge of AI-enabled offensive operations inside and outside our environments

Skills

• You have years of hands-on experience in red teaming and offensive security operations
• You have deep expertise in at least two of: macOS, Linux, cloud (AWS, GCP, Azure), Kubernetes, CI/CD pipelines
• You've found novel attack paths and chained vulnerabilities into full compromise
• You've run adversary simulations against well-defended environments
• You write quality code in Python, Go, or similar languages
• You write findings that get fixed and help teams prioritize risk
• You've worked closely with blue teams
• State-nexus threat models (frontier AI, government, critical infrastructure)
• Testing AI and ML systems (agentic workflows, model serving)
• Defensive experience (detection engineering, SIEM, EDR)
• Hardware and data center attacks (firmware, BMC, OT/ICS)
• Interest in AI safety and security

Company Overview

Fluidstack provides cloud infrastructure for AI with GPU clusters, orchestration, and monitoring for intensive workloads. It was founded in 2017, and is headquartered in New York, New York, USA, with a workforce of 501-1000 employees. Its website is https://www.fluidstack.io.

Company H1B Sponsorship

Fluidstack has a track record of offering H1B sponsorships, with 19 in 2026, 1 in 2025, 2 in 2024. Please note that this does not guarantee sponsorship for this specific role.