Principal Data Scientist — Personalization & Growth

The Briefed; United States; Remote; USD 313,000 - 365,000; Full time

Benefits offered by this job

Competitive base salary + equity

Comprehensive health, dental, vision

401(k) with generous employer matching

Generous vacation + parental leave

Job summary

Reddit is seeking a Senior Principal Data Scientist to shape how we measure, model, and experiment around our consumer flywheel. You will define strategies for discovery, personalization, retention, and long-term value, partnering with Product, Engineering, Research, and Community teams.

You will lead production-grade ML models, mentor senior data scientists, and translate complex analyses into actionable product decisions for executives, influencing Reddit's data science direction.

Qualifications

• Expert in consumer data science with a focus on recommender systems, retrieval, or personalization.
• Strong foundations in causal inference, experiment design, and observational studies.
• Hands-on experience with deep learning frameworks (PyTorch or JAX) and production ML.
• Experience shaping strategy across product, engineering, and research teams.

Responsibilities

• Define measurement, modeling, and experimentation strategies for core consumer questions.
• Lead advanced modeling and ML research to improve long-term user value and engagement.
• Translate statistical findings into actionable product strategies for executives.
• Mentor data scientists and influence Reddit's Data Science organization.
• Collaborate with cross-functional teams including Product, Engineering, and Research.
• Ensure production-grade models with rigorous evaluation and deployment practices.

Skills

Recommender Systems

Information Retrieval

Personalization

User LTV/Lifecycle Modeling

Knowledge Graphs

Causal Inference

Tools

PyTorch

JAX

Job description

Reddit is seeking a Senior Principal Data Scientist to shape how we measure, model, and experiment around our consumer flywheel. You will define strategies for discovery, personalization, retention, and long-term value, partnering with Product, Engineering, Research, and Community teams.

You will lead production-grade ML models, mentor senior data scientists, and translate complex analyses into actionable product decisions for executives, influencing Reddit's data science direction.