Senior Machine Learning Engineer, Advertiser

Opportunity

At Unity, we are building a world‑class ad‑tech ecosystem that connects billions of users with the creators and experiences they love. The Advertiser Growth team is at the heart of this mission, owning the online ads delivery stack, including auctioning, ranking, pacing, and bidding systems. In 2026, our engineering roadmap is defined by three transformative pillars:
Foundation, Smart, and Intelligence. As a Senior Machine Learning Engineer, you will be a key contributor to modernizing our core infrastructure, partnering with research teams to deploy ROI‑driven bidding strategies, and building the backend systems for next‑generation AI agents that revolutionize campaign management. This role offers the chance to solve complex distributed systems challenges at massive scale while directly influencing Unity’s revenue growth.

• Improve the efficiency and reliability of core ads delivery and marketplace systems.
• Optimize real‑time feedback mechanisms to ensure high‑precision delivery and budget management.
• Collaborate on the design and implementation of next‑generation bidding and ranking algorithms.
• Develop scalable infrastructure for automated products that enhance the advertiser experience.
• Partner with cross‑functional teams to drive technical innovation and maintain a high bar for system quality.
• Analyze complex datasets and lead experimentation efforts to optimize performance metrics.

• Scalable Backend
  
  Experience:
  
  Proven experience building and operating large‑scale distributed systems using languages like Java, Go, or Scala.
• Ad‑Tech Domain Knowledge:
  Proven experience in the ads delivery lifecycle, specifically with pacing controllers, auction mechanics, and delivery funnels.
• Real‑Time Data Processing:
  Deep familiarity with low‑latency data pipelines and stream processing technologies like Kafka, Flink, or Spark.
• Systems Optimization:
  Experience building or maintaining control systems, PID controllers, or bid/pricing optimization systems.
• Analytical Mindset:
  Proficiency in metric design, experimentation methodologies, and using data to guide architectural decisions.
• AI/Agentic Interest: (Plus) Experience or a strong interest in building infrastructure to support AI agents or LLM‑integrated backend workflows.

• Relocation support is not available for this position.
• Note:
  
  Certain locations require a good faith disclosure of the base salary range for the role. The actual salary for the successful candidate may differ based on location, experience, and other job‑related factors. Gross pay salary 148,700—223,100 USD.

• 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

We offer a wide range of benefits designed to support employees' well‑being and work‑life balance. You can read more about them on our career page.

Unity [NYSE: U] is the leading platform to create and grow games and interactive experiences. Creators, ranging from game developers to artists, architects, automotive designers, infrastructure experts, and filmmakers, use Unity to bring their imaginations to life across multiple platforms, from mobile, PC, and console, to spatial computing. As of the third quarter of 2024, more than 70% of the top 1,000 mobile games were made with Unity, and in 2024, Made with Unity applications had an average of 3.7 billion downloads per month.

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…