Reddit

Overview

We’re looking for a Senior Staff Machine Learning Engineer to lead Reddit’s next-generation user understanding initiative: building a unified, high-fidelity representation of each user that powers personalization across the platform.

About Reddit

Reddit is a community of communities. It’s built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 130 million daily active unique visitors, Reddit

Requirements & Eligibility

• At least 10 years experience building and scaling production-grade ML systems, particularly in user modeling, large-scale representation learning, or recommender systems
• Track record of driving ambiguous, high-impact initiatives from concept to production
• Product- and impact-oriented with experience moving real metrics
• Strong fundamentals in mainstream user understanding ML approaches such as representation learning, behavioral modeling, and user clustering
• Experience applying LLMs or foundation models to evolve existing systems
• Ability to think in systems, considering data, training, evaluation, serving, and adoption as a cohesive whole

Key Responsibilities

• Design User Understanding Strategy: Define a unified user understanding framework and strategy: how users are represented, computed, stored, and exposed.
• Build Foundational User Models: Lead design and implementation of advanced user models that share representations across surfaces to improve personalization experiences.
• Reimagine user understanding with LLM/Gen-AI: Evolve user modeling beyond traditional representations by leveraging LLMs to build richer user understanding.
• Ship Large Scale User Understanding as a System: Partner with platform teams to design and build core components for large-scale learning and serving.
• Drive Cross-Team Integration & Impact: Partner with Feeds, Notification, Search and Ads teams to drive experimentation and adoption of new user understanding models.
• Set Technical Bar & Mentor: Mentor senior to staff engineers, lead design reviews, and steward technical decisions across the user understanding domain.

Interview Process