AfterQuery - Security Engineer

Pushes the frontier of LLMs and AI agents through novel datasets and experimentation; builds infrastructure powering frontier data creation for agentic and hard-reasoning workflows for leading AI labs and YC companies. Comp: $200K-$350K base (depends on experience) + $250K-$500K (4-year vesting) equity. Visa: Open to visa transfers (e.

g. OPT, H1B transfers). Policy: On-site, 5 days in-office in San Francisco. Own and build After. Query's security posture from the ground up while contributing to core infrastructure; protect highly sensitive AI training data and workflows across integrations with leading model labs. Founding-level role.

What you'll do

Design and implement security infrastructure across cloud/production (GCP/AWS); build the 30/60/90 day plan from scratch Build programmatic, scalable solutions replacing manual security workflows, incl. incident detection, response and resolution Secure sensitive data flows and model interaction layers unique to AI systems Contribute to core infrastructure and horizontal platform work when not on security Integrate security checks into dev workflows without slowing shipping Tech stack: Python, Go, TypeScript, GCP, AWS, Docker/Containers 4-12 yrs security + infrastructure engineering Deeply technical: has built security systems, not just configured off-the-shelf tools Comfortable moving between security work and general engineering On-site 5 days SF