Senior Security Software Engineer, v0

v0 turns natural language into working, deployed applications. An agent writes code, executes it, and ships it on a user's behalf. That makes v0 one of the most interesting and highest-stakes security surfaces at Vercel: sandboxed code execution, multi-tenant isolation, permission boundaries between what a user asked for and what the agent actually did, and resistance to prompt injection and tool misuse.

We're looking for a Senior (IC4) software engineer with a strong security background to sit fully embedded inside the v0 team, not as a rotating auditor who reviews designs and files tickets, but as a peer engineer who owns security end to end for everything v0 ships. That means finding and fixing vulnerabilities yourself, building security features directly into the product, reviewing every new feature and launch before it goes out, and running the relationship with our HackerOne researcher community for anything v0-related. You'll spend real time being a great generalist engineer: building features, fixing bugs, shipping to production alongside the rest of the team. The difference is that you bring security judgment and hands-on ownership to everything the team builds, and you're the one who catches the sandbox escape, the auth gap, or the injection vector before it ships, rather than after.

This role reports into the security organization but is deployed full-time with v0, and is evaluated as much on shipped product velocity as on security outcomes. As a senior (IC4) engineer, you're expected to operate independently, set the security bar for the team, and be trusted to make the final call on v0-specific tradeoffs.

• Find and fix issues yourself: Proactively hunt for vulnerabilities across v0, from code you're reviewing to systems you're actively poking at, and ship the fix, not just the finding.
• Build security features directly into the product: Design and implement the security-facing functionality itself (sandboxing/isolation controls, permission boundaries, abuse detection, safe defaults for generated apps) as a normal part of the v0 roadmap, not a side project.
• Review all new v0 features and launches: Be the security reviewer of record for everything the team ships (new capabilities, generated-app patterns, integrations) before it goes out the door.
• Own the HackerOne relationship for v0: Triage, validate, and drive fixes for reports from Vercel's HackerOne researcher community that touch v0, and work directly with researchers on reproduction and remediation.
• Own the v0 threat model: Understand and continuously refine how v0 generates, executes, and deploys code, including sandbox/runtime isolation, permission boundaries between agent actions and user intent, and defenses against prompt injection and tool-use abuse.
• Harden code execution boundaries: Work directly on how agent-generated code is scoped, sandboxed, and constrained before it touches real infrastructure, including Vercel's own sandbox and serverless runtimes.
• Build guardrails that don't slow the team down: Create patterns, libraries, and checks that let v0 engineers ship new generated-app capabilities quickly without reintroducing known bug classes (auth, SSRF, injection) each time.
• Partner with central Product Security: Share threat models, incident learnings, and SDLC tooling with the broader security team, while making the final call on v0-specific tradeoffs since you have the deepest context on the product.
• Respond to v0-specific security reports and incidents: Be the first responder and technical owner when a security issue is reported against v0 specifically.
• Think like an attacker, and like an agent: Reason about how a user, or an agent acting on that user's behalf, could misuse v0 to attack itself, other tenants, or the platform underneath it.