Senior Application Security Engineer

Unity Technologies•Montreal, QC

10d•$160,300 - $305,400

About The Position

Unity develops the real-time 3D platform that powers games and interactive experiences, along with tools used across ads, automotive, aerospace, architecture, retail, energy, and government. Our Product Security team keeps that platform, and the software built on top of it, safe for millions of creators and their users. We are seeking a Senior Application Security Engineer with profound expertise in application security. In this role, you will execute fundamental AppSec tasks, including threat modeling, secure design reviews, code evaluation, and vulnerability management, leveraging both manual methods and advanced AI tooling. You will also help secure the AI systems Unity itself is building, including agentic tools and AI-assisted development workflows. You will work directly with engineering teams across the US and EMEA.

Requirements

Experience in application security, with a track record on complex, large-scale systems.
Strong command of secure coding and common vulnerability classes (OWASP Top 10 and beyond)
Hands-on secure development experience across several languages.
Practical penetration testing, security assessment, and vulnerability management experience with standard tooling.
Experience with Cloud security (GCP, AWS, or Azure).
Working knowledge of secure architecture patterns.
Clear technical communication for both engineers and non-technical partners across regions.

Nice To Haves

Experience in the technology, gaming or Ad tech industry

Responsibilities

Lead threat modeling, secure design reviews, and penetration testing for Unity products and services, from the engine and editor to cloud services, APIs, and internal platforms.
Perform deep code review and manual testing on high-risk systems, using AI-assisted review processes and covering areas automated tooling cannot fully reach.
Build and operate security automation. Use and extend AI-assisted tooling for continuous code review, finding triage, and automated penetration testing, and step in where human judgment is required.
Secure Unity's AI and agentic systems. Assess AI-native products, LLM integrations, and agent workflows for the risks specific to them.
Partner with engineering teams to drive remediation, turning recurring findings into guardrails, secure defaults, and paved paths.
Investigate and respond to application security incidents, including root cause analysis and durable corrective action.
Contribute to Unity's secure development lifecycle and to compliance work.