Join a high-caliber team of five in San Francisco as the third engineer. You will build an AI-native platform that replaces legacy security stacks by automating vulnerability research, verification, and remediation. You'll develop autonomous agents that simulate CVEs and manage complex entity graphs to protect organizations at machine speed.
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Founding Engineer at Hinoki
We are looking for a Founding Engineer to help us replace 20-year-old legacy security stacks with a live AI-native vulnerability brain. Join an elite 5-person team in San Francisco building autonomous agents that don't just find bugs—they research, verify, and fix them. With a salary up to $270k and significant equity, you will own core platform infrastructure like distributed research labs and entity graphs from day one. If you have 3-6 years of experience building production AI agents and want to ship code that protects global enterprises, this is your chance to be the third engineer at a high-growth cybersecurity startup.
Overview
Role overview
Company
Hinoki
Stealth cybersecurity startup automating enterprise vulnerability management through AI agents
Responsibilities
What you will do
- Architect and scale the distributed scanning runtime and CVE reproduction labs using sandboxed research agents.
- Build a live entity graph that maps messy enterprise asset data across cloud providers and internal systems to business context.
- Design auditable provenance systems that ensure agent-led decisions meet the highest standards of engineering taste and quality.
Candidate profile
Who this is a fit for
- 3-6 years of experience building autonomous AI agents with multi-step reasoning and tool use in production environments.
- Expert-level proficiency in distributed compute, workflow pipelines, and managing high-scale data infrastructure.
- A high bar for engineering quality and an ownership mentality suited for a fast-moving, early-stage founding team.
What makes it remarkable
Why this role is remarkable
- Ship production-grade autonomous systems that go beyond prototypes to drive real-world remediation for Fortune 500 organizations.
- Join an elite founding team in a 5-days-a-week in-person culture located in a premium SF office overlooking the Ferry Building.
- Significant ownership and equity (40-80 bps) in a company tackling the massive $20B+ vulnerability management market with a live AI brain.
Jack & Jill
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Meet Jack
Jack gets to know what you're great at and what you want next, then searches 14 million jobs daily and introduces you directly to hiring managers.
How does this work?
Jack's an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack's network.
If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.