[Hiring] Senior Data Scientist @Unity Technologies

Role Description

Unity’s Ads Experimentation Platform team is looking for a Staff Data Scientist to lead the evolution of how we validate and optimize our global advertising ecosystem. At Unity, our ads reach billions of devices, and the ability to rapidly iterate on machine learning models or ads delivery pipelines is critical to our growth.

In this role, you will be the technical authority for our experimentation and evaluation roadmap. You will bridge the gap between advanced statistical methodology and large-scale engineering, building the tools that allow ML teams to iterate faster and with higher confidence. You will join a team focused on high-velocity innovation, moving beyond standard A/B testing into the next generation of causal inference and high-sensitivity evaluation methodologies.

What you'll be doing

• Advance A/B Testing Efficiency: Lead the implementation of variance reduction (CUPED) and sequential testing to increase platform sensitivity and speed. Develop strategies to mitigate interference and network effects, ensuring results reflect true causal impact in a complex auction environment.
• Scale Ranking Evaluations: Architect and deploy interleaving frameworks to rapidly assess ranking model performance in real-time, enabling the team to identify winning candidates orders-of-magnitude faster than standard bucket testing.
• Reduce Budget Cannibalization Effects: Design methodologies to account for finite advertiser budgets and prevent experimental groups from cannibalizing each other's spend. Develop pacing-aware evaluation techniques to maintain marketplace integrity and ensure unbiased results.
• Define Long-Term Value (LTV) Proxy Metrics: Research and validate surrogate metrics that correlate highly with long-term user retention and value. Provide ML teams with short-term signals that accurately predict long-term impact, enabling faster optimization for long-term growth.
• Drive Automated ML Experimentation: Build the statistical foundations for automated pipelines that autonomously test and select optimal features and hyperparameters, reducing manual engineering overhead and accelerating the deployment of high-performing models at scale.
• Cross-Functional Technical Leadership: Serve as the lead subject matter expert on experimentation for ML, Product, and Engineering teams, ensuring statistical rigor is integrated throughout the product lifecycle, from initial model training to live production auctions.

Qualifications

• 8+ years of experience in Data Science or Applied Research, specifically within Ad Tech, Marketplaces, or high-scale experimentation platforms.
• An MS or PhD in a quantitative field (Statistics, Economics, Computer Science, Operations Research, or equivalent).
• Deep expertise in causal inference, experimental design, and frequentist/Bayesian statistics, with a proven track record of applying these to high-volume, real-time data.
• Strong programming skills in Python or Scala, and experience with large-scale data processing frameworks like Spark, Snowflake, or BigQuery.
• Practical experience implementing advanced testing methodologies like CUPED, interleaving, or switchback testing in production environments.
• Ability to translate complex statistical concepts into clear product roadmaps and mentor engineering teams on experimental rigor.

Requirements

• Experience building or maintaining internal experimentation platforms at a major tech company.
• Familiarity with the unique challenges of long-term value (LTV) prediction and surrogate metric design in mobile gaming or digital advertising.

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