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OpenAI's Host Assurance team is seeking a Software Engineer to build and operate the services, APIs, and host software that establish and maintain trust in compute infrastructure. This role sits at the intersection of hardware security, operating systems, and large-scale cloud infrastructure—working on the critical path of OpenAI's frontier infrastructure investments.
You will own production software end-to-end: from design and implementation through testing, rollout, observability, and operation. Key responsibilities include designing and building components that establish trust in bare-metal and VM hosts before production use, implementing machine identity and certificate issuance systems, building host attestation and measurement tooling, validating hardware and firmware against vendor claims, and eliminating insecure bootstrap patterns while maintaining deployment throughput.
The role requires strong technical judgment across software and host-system boundaries, with the ability to learn unfamiliar parts of the stack. You'll partner closely with infrastructure, research, and confidential computing teams to make secure deployment the easiest path. Success means building systems that are secure, reliable, and usable in fast-moving production environments at global scale.
You'll participate in production support via on-call rotation and help define observable, testable security properties for host platforms. The ideal candidate has strong software engineering experience building and operating reliable production systems at scale, with depth in distributed systems, backend/platform engineering, operating systems, or infrastructure security. Experience with PKI, HSMs, machine identity, attestation, secure boot, or hardware security is valuable but not required. You should be self-directed, pragmatic, and comfortable working in ambiguous spaces where architecture is still emerging.
