Senior Application Security Engineer

Unity Enterprise

København

On-site

DKK 702,000 - 1,053,000

Full time

14 days+

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Benefits offered by this job

Health insurance

Commuter subsidy

Employee stock ownership

Pension plan

Vacation and personal days

Parental leave support

Office snacks

Wellbeing programs

ERGs (Employee Resource Groups)

EAP (Employee Assistance Program)

Training and development programs

Volunteer program

Job summary

Unity is seeking a Senior Application Security Engineer to lead threat modeling, secure design reviews, and penetration testing across engine, editor, cloud services, and APIs. You will perform deep code reviews, build security automation, and extend AI-assisted tooling for continuous code review and testing.

Collaborate with engineering teams to remediate findings and secure Unity’s AI systems. You will work with global teams across US and EMEA, ensuring secure development practices,

Qualifications

5+ years in application security on large-scale systems.
Solid understanding of secure coding and common vulnerability classes.
Hands-on secure development experience across several languages.
Experience with cloud security (GCP, AWS, or Azure).
Root-cause analysis and remediation would be beneficial.

Responsibilities

Lead threat modeling, secure design reviews, and pen tests for Unity products and services.
Perform deep code reviews and manual testing on high-risk systems with AI-assisted reviews.
Build and operate security automation and extend AI-assisted tooling for code review and testing.
Secure Unity's AI and agentic systems and assess AI-native products for risks.
Partner with engineering teams to drive remediation and secure defaults.

Skills

Threat modeling

Secure design reviews

Code review

Penetration testing

AI tooling

Cloud security

Secure coding

Technical communication

Tools

SAST

DAST

SCA

Job description

Senior Application Security Engineer

Unity builds 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.

What you will do

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.

What you bring

domain expertise 5+ years 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 (SAST, DAST, SCA, and manual techniques).
Experience with Cloud security (GCP, AWS, or Azure).
Working knowledge of authentication, authorization, cryptography, and secure architecture patterns.
Clear technical communication for both engineers and non-technical partners across regions.

Preferred Qualifications

Experience in the technology, gaming industry or Ad tech.

Base Salary Range: kr702,200 – kr1,053,400 DKK gross

This range reflects the anticipated base salary for this position. Beyond base salary, this role may be eligible for equity awards and participation in our company incentive plans (such as annual discretionary bonuses or sales commissions).

Benefits

Comprehensive health, life, and disability insurance
Commute subsidy
Employee stock ownership
Competitive retirement/pension plans
Generous vacation and personal days
Support for new parents through leave and family-care programs
Office food snacks
Mental Health and Wellbeing programs and support
Employee Resource Groups
Global Employee Assistance Program
Training and development programs
Volunteering and donation matching program

Life at Unity

Unity is a proud equal opportunity employer. We are committed to fostering an inclusive, innovative environment and celebrate our employees across age, race, color, ancestry, national origin, religion, disability, sex, gender identity or expression, sexual orientation, or any other protected status in accordance with applicable law. Our differences are strengths that enable us to support the growing and evolving needs of our customers, partners, and collaborators.

If you have a disability that means there are preparations or accommodations we can make to help ensure you have a comfortable and positive interview experience, please fill out this form to let us know.

This position requires the incumbent to have a sufficient knowledge of English to have professional verbal and written exchanges in this language since the performance of the duties related to this position requires frequent and regular communication with colleagues and partners located worldwide and whose common language is English.

This posting is intended to fill an existing vacancy, and we are committed to providing applicants with updates throughout the hiring process in accordance with applicable law.

Headhunters and recruitment agencies may not submit resumes/CVs through this website or directly to managers. Unity does not accept unsolicited headhunter and agency resumes. Unity will not pay fees to any third-party agency or company that does not have a signed agreement with Unity.

Your privacy is important to us. Please take a moment to review our Prospect and Applicant Privacy Policies. Should you have any concerns about your privacy, please contact us at DPO@unity.com.

Unity [NYSE: U] is the world’s leading game engine, powering play for more than 3 billion consumers each month. The top mobile games in the world, the most played PC indie titles, the most innovative console games, and virtually all of the top XR and Web Games are developed, deployed, and grown in Unity. Unity also enables teams across industries like automotive, manufacturing, and healthcare to design, simulate, and collaborate in 3D — closing the gap between ideas and reality.

At Unity, we're committed to creating a workplace that fosters collaboration and teamwork that allows you to harness your unique skills. Join us in creating industry tools to help creators of all levels bring their projects to reality. Learn more about our culture and values, and get a head start by reading about how our hiring process works.

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