The Principal Applied Scientist role in the Microsoft Ads Fraud Detection team focuses on combating fraud in one of the largest advertising ecosystems globally. This position involves leading complex fraud detection initiatives, developing advanced machine learning models, and ensuring the reliability and performance of detection systems. The role requires collaboration across various teams to operationalize research and enhance fraud detection capabilities. The successful candidate will also mentor other scientists and drive technical excellence within the organization.

• Bachelor's Degree in Statistics, Econometrics, Computer Science, Electrical or Computer Engineering, or related field with 6+ years of related experience, or a Master's Degree with 4+ years of experience, or a Doctorate with 3+ years of experience.
• Ability to meet Microsoft, customer and/or government security screening requirements.
• Extensive industry experience delivering machine learning solutions to production.
• Proven track record architecting scalable ML systems and low-latency decision pipelines.
• Deep expertise in statistical machine learning, anomaly detection, fraud modeling, and related areas.

• Independently lead and execute multiple high-impact fraud detection initiatives.
• Develop practical, deployable machine learning solutions that operate reliably at production scale.
• Translate scientific insights into production impact through rigorous experimentation and continuous optimization.
• Apply advanced ML methods with clear evaluation frameworks and success metrics.
• Drive technical collaboration across science, engineering, ads, security, and privacy teams.

• Employees at Microsoft are often offered comprehensive, “world-class” benefits—including health and mental-wellness programs, competitive pay with bonuses and stock awards, and retirement/savings options. Time-off and flexibility are common, with generous vacation and holidays, parental and caregiver leave, and flexible work schedules, alongside learning support, employee resource groups, product discounts, and matching-gifts/volunteering programs. Specific benefits can vary by region.