Senior ML Engineer — Personalization & Recommendations

Perplexity AI Inc.; San Francisco (CA); On-site; USD 120,000 - 160,000; Full time

Job summary

Perplexity AI Inc. is seeking experienced ML Engineers to design and optimize core recommendation systems, enhancing user experience. Successful candidates will have hands-on experience in production environments developing personalization, ranking, and user modeling systems.

Ideal applicants possess strong fundamentals in machine learning and familiarity with large-scale infrastructure. The role emphasizes ownership, creativity, and a data-driven approach to improve user engagement and business metrics.

Qualifications

• Deep, hands-on experience building production recommendation, ranking, or personalization systems at scale.
• Strong ML fundamentals in engagement modeling and model calibration.
• Experience integrating LLMs into ranking or retrieval systems.

Responsibilities

• Own personalization and ranking for product surfaces to drive user and business impact.
• Build user modeling that captures intent and enhances personalization.
• Design systems that balance competing objectives for best user experience.

Skills

Experience building recommendation systems

Strong ML fundamentals

Integrating LLMs into pipelines

Judgment for personalization design

Technical leadership experience

Tools

Large-scale ranking infrastructure

Real-time serving

Job description

Perplexity AI Inc. is seeking experienced ML Engineers to design and optimize core recommendation systems, enhancing user experience. Successful candidates will have hands-on experience in production environments developing personalization, ranking, and user modeling systems.

Ideal applicants possess strong fundamentals in machine learning and familiarity with large-scale infrastructure. The role emphasizes ownership, creativity, and a data-driven approach to improve user engagement and business metrics.