Machine Learning Engineer, Ads Personalization

Unity Technologies; Mountain View (CA); On-site; USD 159,600 - 239,400; Full time

Benefits offered by this job

Health insurance

Commuter subsidy

Employee stock ownership

Competitive retirement plans

Generous vacation and personal days

Parental leave

Job summary

Unity is seeking a Senior Gamer AI Engineer to advance our ad ranking and recommendation systems. You will build and maintain user understanding models, ensuring model quality and addressing data drift across large-scale deployments.

Applicants should have 5+ years in Ads systems, 3+ years in content understanding, and strong proficiency in Python, Go, Scala, or C++. This role is based in Mountain View, CA with on-site expectations.

Qualifications

• Advanced degree in CS/ML/Statistics or equivalent practical experience.
• 5+ years building and operating large-scale Ads delivery/optimization systems.
• 3+ years in content understanding, behavior modeling, user profiling, and cohort analysis.
• Knowledge of metric design, experimentation, and large-scale data analysis.

Responsibilities

• Design, implement, and maintain user understanding models.
• Monitor performance, calibrate predictions, and address data drift or delayed feedback.
• Set long-term direction with leads, plan and oversee engineering designs and execution.
• Translate complex technical concepts for non-engineering stakeholders.

Skills

Advanced degree in CS/ML/Statistics

Machine learning

Communication with stakeholders

Education

MS or PhD in Computer Science, Machine Learning, Statistics

Tools

Python

Go

Scala

C++

Job description

The opportunity

Our Gamer AI team develops conversion rate prediction and market price models that power our ad ranking and recommendation systems. By leveraging large-scale data and contextual signals, we continuously enhance prediction relevance and accuracy. This drives outcomes such as higher user engagement, stronger conversion performance, and better return on ad spend, helping advertisers achieve their goals while delivering a more engaging experience for users.

What you’ll be doing

• Design, implement, and maintain user understanding models.
• Ensure model quality and reliability by continuously monitoring performance, calibrating predictions, and addressing data drift or delayed feedback.
• Actively participate and work with other leads to set the long‑term direction for the team, plan and oversee engineering designs and project execution.
• Effectively communicate complex technical concepts to non-engineering stakeholders.

What we’re looking for

• Advanced degree (MS or Ph.D.) in Computer Science, Machine Learning, Statistics, related field, or equivalent practical experience.
• 5+ years of hands-on experience building and operating large-scale Ads delivery and optimization systems.
• 3+ years of experience in content understanding, behavior modeling, user profiling, and cohort analysis.
• Significant experience in one or more general-purpose programming languages like Python, Go, Scala, C++ or similar.
• Knowledge of metric design, experimentation methodologies, and large-scale data analysis.

You might also have

• Experience designing and productionizing optimization algorithms in an ad serving platform and/or other marketplaces.
• Experience with state-of-the-art control systems, reinforcement learning algorithms.

Additional information

Relocation support is not available for this position

Annual Gross Pay: USD $159,600 - $239,400

Benefits

At Unity, we want our team members to thrive. We offer a wide range of benefits designed to support well-being and work-life balance.

Specific benefits vary based on country and employment status.

While specific benefits vary, here are some of the ways we strive to take care of our eligible team members globally:

• 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.

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.

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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 (https://unity.com/our-company), and get a head start by reading about how our hiring process works (https://unity.com/blog/news/want-to-work-at-unity-heres-how-our-hiring-process-works).