Infrastructure Security Lead

Together AI; San Francisco (CA); On-site; USD 200,000 - 300,000; Full time

Benefits offered by this job

Health insurance

Startup equity

Job summary

Together AI is seeking a hands-on security leader to own infrastructure security for its globally distributed systems. You will be the technical owner, building internal security tooling, expanding telemetry, and hardening training clusters, GPU fleets, model artifacts, and inference endpoints.

You will report to the SVP of Engineering, define security standards, grow the team, and shape how security enables rapid, safe development of cutting-edge AI infrastructure.

Qualifications

• Hands-on security leadership—lead by example, build with the team.
• Strong systems and cloud-native engineering with Linux expertise.
• Fluency in automation and IaC (Terraform, Ansible, Salt).
• Pragmatic security mindset that enables velocity with safety.

Responsibilities

• Own infrastructure security for globally distributed systems.
• Build and lead infrastructure security team and define standards.
• Harden global systems with security-by-design, accelerate secure shipping.

Skills

Security leadership

Linux administration

Automation / IaC

Cloud-native engineering

Threat detection

Tools

OSQuery

Falco

SIEM

Job description

Together AI is a research-driven AI infrastructure company building the go-to platform for developers to run, fine-tune, and build on open models. We believe open and transparent AI systems drive innovation and create the best outcomes for society, and we're on a mission to dramatically lower the cost of modern AI systems. Our team has helped ship foundational open-source research like FlashAttention, FlexGen, and RedPajama - and we're building the next generation of AI infrastructure.

About the Role

We're looking for a hands-on security leader to own infrastructure security.

You’ll be the technical owner of how we keep our systems secure, building internal security tooling, deepening our detection and telemetry, and hardening our global infrastructure against threats that range from opportunistic attackers to sophisticated nation-state actors.

You’ll report directly to our SVP of Engineering and help define infrastructure security. Over time, you’ll grow the team, set the standards, and increasingly shape how we secure the systems at the heart of modern AI: training clusters, GPU fleets, model artifacts, and inference.

Responsibilities

• Own infrastructure security for Together AI's globally distributed systems - hands-on, as the technical leader of the function.
• Build and lead the infrastructure security team, defining what great looks like and attracting engineers who want to build with you.
• Partner with engineering and infrastructure teams to harden global systems - shipping security as something that speeds engineering up, not slows it down.
• Develop and implement internal security tooling that addresses security challenges at scale.
• Deepen our security telemetry and detection - gathering system telemetry and improving detection of and response to potential security events.
• Identify and remediate vulnerabilities across our engineering systems, including authenticated vulnerability scanning of distributed systems.
• Grow into securing the AI-specific surface - training clusters, GPU fleets, model artifacts, and inference endpoints - as the threat landscape evolves.

Requirements

• Hands-on security leadership - you can lead a team and stay deep in the technical work. You lead by building, not just by delegating.
• Strong systems and cloud-native software engineering experience, with deep proficiency in Linux configuration, security, and administration.
• Fluency with automation and infrastructure-as-code (Terraform, Ansible, and/or Salt) to solve security problems at scale.
• A pragmatic security instinct - you treat security as an enabler, make sound risk calls, and help the team ship safely and fast rather than piling on friction.
• Experience with security telemetry and detection (e.g. OSQuery, Falco, SIEM) and with finding and fixing vulnerabilities in distributed systems.
• Curiosity about how AI changes the security landscape - you don't need to be an AI-security expert today, but you're the kind of engineer who becomes one.
• Bonus: Go or Rust development, cloud-native service experience (AWS, GCP), deep Linux/networking fundamentals, OCP familiarity (OpenBMC, Coreboot, Linuxboot), or a public security-practitioner footprint (talks, OSS, writing).

Compensation

We offer competitive compensation, startup equity, health insurance and other competitive benefits. The US base salary range for this full-time position is: $200k - 300k+ equity + benefits. Our salary ranges are determined by location, level and role. Individual compensation will be determined by experience, skills, and job-related knowledge.

Together AI is an Equal Opportunity Employer and is proud to offer equal employment opportunity to everyone regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, veteran status, and more.