Senior ML Engineer — Ranking & Personalization Lead

Roku; San Jose (CA); Hybrid; USD 361,300 - 510,000; Full time

Benefits offered by this job

Health insurance

Equity awards

Life insurance

Disability benefits

Parental leave

Wellness benefits

Paid time off

Job summary

Roku is seeking a Senior Machine Learning Tech Lead in California to drive ranking and personalization for its entertainment assistant. You will lead large-scale ML systems, balancing engagement, retention, and monetization across discovery surfaces.

Ideal candidates have 8+ years applying ML at scale, strong expertise in ranking and personalization, and solid Python/Java/Scala skills. The role offers health insurance, equity awards, life insurance, disability benefits, parental leave, wellness,

Qualifications

• 8+ years applying ML at scale in search, recommender, or related domains.
• Strong expertise in ranking, personalization, and multi-objective optimization.
• Proficiency in Python, Java, or Scala; experience with distributed systems.

Responsibilities

• Lead the technical vision and roadmap for ranking, personalization, and recommendations.
• Develop and deploy state-of-the-art ML models (DL, transformers, LLMs, RL).
• Build multi-objective optimization systems balancing engagement, retention, monetization.
• Mentor engineers and collaborate with cross-functional teams.

Skills

8+ years experience

Leadership

Python

Java

Scala

Distributed systems

ML at scale

Strong product intuition

Education

MS or PhD in Computer Science/Statistics

Tools

Spark

Airflow

Cloud platforms

Feature stores

ML infrastructure

Job description

Roku is seeking a Senior Machine Learning Tech Lead in California to drive ranking and personalization for its entertainment assistant. You will lead large-scale ML systems, balancing engagement, retention, and monetization across discovery surfaces.

Ideal candidates have 8+ years applying ML at scale, strong expertise in ranking and personalization, and solid Python/Java/Scala skills. The role offers health insurance, equity awards, life insurance, disability benefits, parental leave, wellness,