Offensive Security Engineer

Full time • San Francisco, CA • $180K – $250K

Parameter builds AI agents that do offensive security work. Our agents run autonomous penetration tests against production applications and cloud environments, finding IDORs, broken access control, XSS, and infrastructure misconfigurations that scanners miss and that human pentest firms only look for once or twice a year.

We are not a theoretical security company. Our team has responsibly disclosed real, high-severity vulnerabilities to well-known technology companies, and our findings are the front door to most of our customer relationships.

You are the person whose expertise gets encoded into the product. You'll do real offensive work against customer environments, then turn your methodology into agent capability.

The title points at where you'll spend most of your time. Expect the rest of the week to go wherever the work is: agent systems one day, the product the next, a customer call or a report that has to go out after that. We are small enough that everyone works across every product, and we hire people who want that.

What you'll do

• Run manual penetration tests against customer web applications, APIs, and cloud infrastructure

• Translate your methodology into agent capabilities: new attack modules, detection logic, and verification steps

• Validate and triage agent findings before they reach customers. You are the quality bar

• Lead the technical side of customer engagements, including scoping calls and findings walkthroughs

• Contribute to our vulnerability research and responsible disclosure work, which is a core part of how we go to market

What we're looking for

• 3+ years of hands-on offensive security: web application pentesting, red teaming, or serious bug bounty work

• Deep knowledge of web application vulnerability classes, particularly access control, authentication, and business logic flaws

• Cloud security experience across AWS or GCP: IAM, misconfiguration, privilege escalation paths

• You write code and build your own tooling rather than only running other people's. We're a TypeScript shop, but we care more that you build than what you've built in

• Ability to write clearly for both engineers and executives. Findings that nobody understands do not get fixed

• Bonus: OSCP, OSWE, published CVEs, bug bounty leaderboard placement, or conference talks

Interview process

• Intro call with a founder (30 minutes)

• Technical deep dive on your past work (60 minutes)

• Paid work trial or take-home, scoped to roughly one day

• Onsite in San Francisco with the team

• References and offer

We move quickly. Our target is an offer within two weeks of first contact. Small team, high trust, extremely fast. If you want to see your work in front of customers within days, this is that.

This role is onsite in San Francisco. You must be authorized to work in the US; we are not able to sponsor visas at this time.