Security Engineer at Endex (New York, NY)
Endex· New York, NY·
Role details
Job description
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 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.
Nice to Have
- Experience with cloud and identity security
- Experience with enterprise SaaS or AI applications
- Experience with cloud IAM, application security, threat modeling or securing AI systems
Full-Time Benefits
- Health & Dental Insurance
- Monthly Wellness Stipend
- 401K Matching
Why work at Endex
- Culture: Fast-moving AI startup backed by OpenAI, working on cutting-edge reasoning models applied to a high-stakes domain. Team is small (~20 people) with a technical majority (37% of headcount in engineering/research).
- Remote/Hybrid: Offices in New York City (HQ) and team members across Israel, Canada, and Brazil – likely flexible work arrangements.
- Notable perks/engineering culture:
- Direct access to OpenAI’s latest models and research collaboration.
- Opportunity to solve hard problems in financial AI (multimodal analysis, agentic workflows, reinforcement fine-tuning).
- Emphasis on continuous evaluation and improvement – the team tracks metrics like response latency and reasoning depth.
- Recent hires from top firms (Jump Trading, Two Sigma, Shopify) and university partnerships (Columbia Business School).