Senior Machine Learning Engineer - Ranking

Job Category

Join us to shape how users discover and interact with our marketplace. You’ll advance algorithms for ordering prioritization and personalization. Ranking is a core component which helps users discover ads balance user satisfaction business goals and system health.

Responsibilities

• Design and improve ranking systems through rigorous measurement and experimentation; translate broad goals into clear metrics and deliver steady validated gains.

• Advance evaluation practices (clean test design offline & online alignment) and help teams make evidence-based decisions.

• Build high-value signals and features with reliable offline/online pipelines and robust monitoring. Incorporate content understanding signals such as text/image/metadata.

• Make uncertainty-aware decisions; handle drift and calibration so models remain stable and trustworthy over time.

Partner with Engineering Product Business and Analytics to ship resilient solutions end-to-end.

Requirements

• Advanced degree (MS/PhD) in CS Statistics or related field with 3+ years post-PhD or 5+ years industry experience.

• Strong foundations in applied ML statistics and optimization with demonstrated impact in ranking/recommendations.

• Proficiency in Python and solid software engineering practices (testing CI/CD).

• Experience working with large-scale datasets distributed systems and latency-sensitive production ML.

• Clear communication cross-functional collaboration and an ownership mindset.

Preferred Qualifications

• Demonstrated success in delivering production-grade ranking systems with measurable business impact.

• Track record building feature/signals pipelines feature stores and observability for ML systems.

• Depth in experimentation and metrics design including large-scale A/B testing and variance reduction.

The expected salary range for this position is $140000 USD to $170000 USD annually. This salary range is an estimate and the actual salary may vary based on the Company’s compensation practices. The salary may be adjusted based on applicant's geographic location. The position is also eligible to receive performance bonus or commission and equity in the form of restricted stock units. This position is eligible to participate in the Company’s standard employee benefits programs which currently include health care benefits; (2) retirement benefits; (3) the amount of paid days off (paid sick leave parental leave paid time off or vacation benefits); (4) any other tax-reportable benefits.