Application Security Engineer
Hark, San Jose +1
The role
We're hiring a Member of Technical Staff (Application Security Engineer) to own the security of the software Hark ships. You'll review design and code, find and fix vulnerabilities in our backend services, mobile apps, and third-party integrations, and build the guardrails that let engineers move fast without shipping bugs. Our agents act on behalf of users across their apps and data, so you'll also be defining how to secure LLM and agent systems, a space with very few established playbooks.
This role is hands-on; you'll be reading code, writing fixes, and building tooling, not managing or auditing.
What you will do
- Threat-model new features and services, with a focus on agent/LLM attack surfaces (prompt injection, tool misuse, data exfiltration, cross-tenant access).
- Review code and designs for Hark's backend services (primarily Go), APIs, and mobile apps; fix vulnerabilities directly when it's faster than filing a ticket.
- Secure authentication, authorization, and session handling across our consumer product, including OAuth integrations with third-party platforms.