About the job
We are looking for a Senior Machine Learning Engineer to join our Ads Conversion Modeling team. In this role, you will design and build scalable machine learning systems that power ad ranking and conversion prediction across large-scale advertising platforms. As a key member of the Vector AI group, you will play a central role in driving Unity’s monetization engine. You will work with massive datasets and rich signals to develop the state-of-the-art conversion rate prediction model. This model serves as the core intelligence behind delivering the right ad to the right user at the right time, maximizing both user experience and advertiser outcomes.
Responsibilities
Design, implement, and optimize the CVR prediction model
Build and enhance multi-objective ranking systems balancing retention, monetization, diversity, and long-term value
Solve cold-start problems for new users, new games, and new creatives
Conduct offline evaluations and online A/B experiments to deliver measurable impact
Partner closely with product, infrastructure, and monetization teams
Continuously improve model quality, serving latency, and system scalability
Qualifications
Minimum
Hands-on experience applying state-of-the-art machine learning and deep learning models to complex real-world problems
Strong software engineering skills in Python and experience with deep learning frameworks, preferably PyTorch
Solid understanding of metric design, experimentation frameworks, and large-scale data analysis
Proven ability to lead projects end-to-end and deliver measurable business impact
Preferred
Experience working with large datasets and distributed computing frameworks
Experience building CVR systems, content understanding, or behavior modeling systems
Experience embracing AI as a strategic advantage in engineering, following established best practices for code quality and security