# Security Engineer, Application Security at Mercor

- Company: Mercor
- Status: Open
- Workplace: On-site
- Location: San Francisco · New York City
- Level: Mid-level
- Discipline: Security
- Employment: Full-time
- Salary: $130K–400K
- Posted: 2026-09-04
- Skills: Security
- Apply: https://jobs.ashbyhq.com/mercor/cf6fcf5a-6348-4d60-beb3-43333a2c2bb9

## Description

ABOUT MERCOR



Mercor's mission is to organize human intelligence to power the AI economy. We're a leading AI data company, building the layer between human expertise and frontier models. Millions of domain experts on the platform are paid over $4 million per day to train frontier AI models. Mercor's APEX benchmark family measures AI's real-world impact on professional work. Mercor Enterprise brings this same infrastructure to Fortune 500 companies: helping companies capture how their best people actually work, translating that expertise directly back into agents.

 

Mercor is creating a new category of work where expertise powers AI advancement. Achieving this requires an ambitious, fast-paced and deeply committed team. You’ll work alongside researchers, operators, and AI companies at the forefront of shaping the systems that are redefining society. Mercor is a profitable Series C company valued at $10 billion. We work in-person five days a week in our San Francisco, NYC, or London offices.

You'll own application security at a company where the app layer is the highest-priority security surface. This is not a scan-and-triage role. You'll embed in the development lifecycle, review code for exploitable flaws, build security tooling into CI/CD, and drive vulnerability remediation across a platform serving 300K+ experts and enterprise clients processing sensitive AI training data.

We use AI heavily in our own security work. You should be comfortable building alongside AI code-gen tools, using LLMs to accelerate code review and threat modeling, and automating away the repet

More Mercor roles: https://deviantjobs.com/companies/mercor