Senior Application Security Engineer

ironSource; København; On-site; DKK 702,000 - 1,053,000; Full time

Benefits offered by this job

Health insurance

Commuting subsidy

Employee stock ownership

Job summary

Unity seeks a Senior Application Security Engineer to lead threat modeling, secure design reviews, and penetration testing across Unity’s real-time 3D platform and cloud services.

You will perform deep code reviews, implement AI-assisted security tooling, and secure AI/agentic systems while partnering with global engineering teams to reduce risk and strengthen the SDLC.

Qualifications

• 5+ years in application security and experience with large-scale systems.
• Strong command of secure coding practices and vulnerability classes (OWASP Top 10).
• Hands-on secure development across multiple languages.
• Proven penetration testing, security assessment and vulnerability management skills.
• Experience with cloud security (GCP/AWS/Azure).
• Clear technical communication for engineers and non-technical partners.

Responsibilities

• Lead threat modeling, secure design reviews, and penetration testing for Unity products and services across engine, editor, cloud, APIs, and internal platforms.
• Perform deep code review and manual testing on high-risk systems using AI-assisted review where applicable.
• Build and operate security automation, extend AI-assisted tooling for code review, triage, and automated testing.
• Secure Unity's AI and agentic systems, assess AI-native products and LLM integrations.
• Collaborate with engineering teams to drive remediation, establish guardrails and secure defaults.
• Investigate security incidents with root cause analysis and durable corrective action.
• Contribute to Unity's secure development lifecycle and compliance efforts.

Skills

AppSec experience

Secure coding

Penetration testing

Cloud security

Technical communication

Tools

SAST

DAST

SCA

Manual testing

Job description

Senior Application Security Engineer

About the role

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.

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

Isreal Base Salary Range: ₪352,000 - ₪528,000 ILS 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). The final offer amount will depend on several factors, including geographic location and the candidate’s relevant experience, professional background, and skill set.

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 [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. For more information, please visit www.unity.com.

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.

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