Who We Are

Endex builds AI agents that handle complex, end-to-end work for the world's most demanding teams. Today we're deployed across leading financial institutions and Fortune 500 companies, embedded in the tools and workflows they rely on. We operate at the frontier of agentic knowledge work, partnering closely with top AI research labs and backed by the OpenAI Startup Fund. We're on a mission to build the most capable digital coworker in the world.

About the Role

Location: New York City (Primary), Denver, Chicago, Singapore (APAC), London, San Francisco, Austin, Los Angeles
Commitment: 5 Days In-Person

We're looking for an engineer who can find meaningful security weaknesses and work with the team to fix them.

As a Security Engineer at Endex, you'll build security improvements across our applications and infrastructure. You'll work directly with product engineers and compliance owners to turn identified risks into tested technical controls.

Your Key Responsibilities

• Secure Product Architecture: Review authentication, authorization, tenant boundaries and data flows to find practical weaknesses before they reach production.
• Build Technical Defenses: Improve cloud identity, secrets management, application protections and security checks with the engineering team.
• Manage Vulnerabilities: Investigate findings, prioritize remediation and verify fixes.
• Support Secure Development: Build useful checks and guidance into engineering workflows.
• Investigate and Learn: Help analyze security incidents and build detection or prevention improvements that address the underlying failure mode.

What We're Looking For

• Security Engineering Experience: You've investigated and remediated real application or cloud security issues.
• Software Fluency: You can read code, build tooling and work with production systems.
• Risk Judgment: You prioritize based on impact and the way a system is used.
• Clear Communication: You explain findings and fixes so engineers can act.
• Practical Security Depth: You can inspect code and cloud systems, verify a finding and help implement a fix that engineers can maintain.