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Security Engineer, Application Security

Mercor -
New York, NY

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Job Details

Full-time
$130,000 - $400,000 a year

Benefits

Health insurance
Dental insurance
Vision insurance

Qualifications

Production systems

Full Job 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 repetitive work that slows AppSec programs down. If you'd rather write a CodeQL query than file a Jira ticket, you'll fit in here.

We're in-person five days a week at our SF headquarters, with first Fridays remote.

What You'll Build:

Security review workflows embedded in the SDLC - PR-level analysis that catches auth bugs, injection flaws, and business logic errors before they ship
SAST/DAST pipelines integrated into CI/CD - shifting security left without slowing down deploys
Vulnerability management processes that prioritize by real exploitability, not CVSS score
Secure coding standards and guardrails that make the safe path the easy path for 50+ engineers
Threat models for new features and architecture changes - especially around AI data pipelines, payment flows, and multi-tenant boundaries
Bug bounty program operations - triaging HackerOne reports, validating findings, and driving fixes to closure

What We're Looking For

You've found and fixed real vulnerabilities in production applications - not just run scanners
Deep understanding of web application security: OWASP Top 10 is baseline, you think in terms of attack chains and business logic flaws
Strong in at least one of Python, TypeScript, or Go - you can read a PR and spot the auth bypass
Experience building or tuning SAST/DAST tooling (Semgrep, CodeQL, Snyk, Burp, or similar)
You understand modern web frameworks, APIs, and authentication patterns well enough to threat model them
Experience managing a vulnerability pipeline - from discovery through prioritization to verified remediation
5+ years of professional experience in application security, security engineering, or software engineering with a strong security focus

Bonus Points

Experience running or triaging a bug bounty program (HackerOne, Bugcrowd)
Offensive security skills - you've done penetration testing and can think like an attacker
Experience securing AI/ML applications - model serving APIs, training data pipelines, prompt injection defense
Familiarity with supply chain security - dependency scanning, registry firewalls (Socket, Snyk)
You've built custom security tooling that a team still uses
Contributions to open source security projects or published vulnerability research

Why Mercor

The problem is real. Application security at scale is hard - you'll build defenses that matter across a fast-moving platform.
AI-native AppSec. You'll use frontier AI tools daily - for code review, vulnerability analysis, and anything that benefits from an AI co-pilot.
Ownership from day one. You'll own the entire application security domain - from code review processes to CI/CD security to bug bounty operations.
See the future early. Working alongside AI labs means you'll understand frontier model capabilities months before the market.
Benefits
- Bi-annual performance bonus structure
- Generous equity grant vested over 4 years
- Up to $15k Relocation bonus
- $10K housing bonus (if you live within 0.5 miles of our office)
- $1.5K monthly stipend for meals
- Free Equinox membership
- $200 monthly laundry reimbursement
- $200 monthly personal wellness reimbursement
- Health, Dental, Vision insurance

Compensation Range: $130K - $400K

Apply Now

Refine Your Search

platform engineer jobs in queens ny

Security Engineer, Application Security

Frontend Engineer - User Interface

AI Platform Support Engineer

Software Engineer, Frontend

Full Stack Engineer (Laravel)

Frontend Engineer

Security Integration & Security Systems Engineer

Technical Director - Animatronics Lead – Holiday Window Displays

Manufacturing Engineer

Handyman/Building Mechanic

POMS MES Techno-Functional SME

Solution Architect

Infrastructure Engineer (DevOps Focus)

Reporter, Secondaries Investor

Business Solutions Architect

Software Developer - AI Trainer

Marketing Automation Engineer

Backend Software Engineer - AI Trainer

Electrical Engineer

Underwriter, Financial Institutions

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