Jeffrey Zhang

Security Engineer at Stripe. Co-presented “Guardrails Beyond Vibes: Shipping Security Agents in Production” with Siddh Shah at [[unprompted-conference-march-2026|[un]prompted Conference]] (March 3, 2026, Stage 1 Lecture 05).

LinkedIn: j778zhan

Contribution to this wiki

Primary source: Guardrails Beyond Vibes: Shipping Security Agents in Production. Zhang is the Security Engineer half of the team; the talk covers two production security agents at Stripe (a threat modeling agent and a security routing agent), their multi-agent architecture, evaluation pipeline design using LLM-as-a-Judge with golden-standard test cases, and five operational learnings including the failure of AlphaEvolve for prompt optimization.

Companion Stripe talk at the same conference: Breaking the Lethal Trifecta (Without Ruining Your Agents) by Andrew Bullen (Head of AI Security at Stripe), delivered the following day.