Staff Machine Learning Engineer, Notifications Relevance

About the role

Reddit is a community of communities, built on shared interests, passion, and trust, and home to the most open and authentic conversations on the internet. The Notifications Relevance team at Reddit is building the next generation of notifications focused on delivering the right content to the right user at the right time using the right channel (push notification, email digest, and in-app). We are the second largest growth lever at Reddit and a core component to understanding how to delight our current user base and bring new users to discover all that Reddit has to offer.

As a Staff Machine Learning Engineer on Notifications Relevance, you'll serve as a technical leader for one of Reddit's highest-leverage ML systems, helping millions of users discover relevant content, communities, and conversations every day. You'll drive the strategy, architecture, and execution of large-scale recommendation systems spanning targeting, budget optimization, retrieval, ranking, measurement, and emerging LLM-powered experiences. This role offers the opportunity to shape the future of engagement and retention at Reddit while pushing the boundaries of personalization and machine learning at massive scale.

Responsibilities

• Contribute to advancing Reddit's growth by designing and implementing content discovery algorithms that prioritize a seamless and highly personalized user experience.
• Deeply understand the Reddit Notifications product and drive the vision for the notifications relevance team.
• Enhance core recommendation capabilities, including candidate retrieval, ranking models, and budgeting optimization, while designing and testing new pipeline components. Deploy ML models, integrate LLMs, and ensure robust monitoring and smooth product integration throughout the process.
• Serve as the primary ML domain expert, deploying state-of-the-art models at scale, driving architectural decisions, and ensuring robust monitoring and smooth product integration across the engineering organization.
• Collaborate across disciplines and with ML, Product, Infrastructure, and DS teams at Reddit to find technical solutions to complex challenges.

Requirements

• 8+ years of industry experience with deep expertise in large-scale recommendation systems; notifications experience preferred.
• Proven ability to identify key opportunities, define roadmaps, and drive scalable improvement in notifications relevance.
• Strong experience in building and deploying large-scale ML models using frameworks such as PyTorch or TensorFlow.
• Experience working with LLMs in production and utilizing generative AI to augment recommendation systems.
• Proficiency in object-oriented programming (Python, Golang).
• Experience with state-of-the-art model architectures (big plus).
• Experience building production Agentic AI frameworks (big plus).

Benefits

• Comprehensive healthcare benefits and income replacement programs.
• 401k with employer match.
• Global benefit programs that fit your lifestyle, from workspace to professional development to caregiving support.
• Family planning support.
• Gender-affirming care.
• Mental health and coaching benefits.
• Flexible vacation and paid volunteer time off.
• Generous paid parental leave.

Pay

The base salary range for this position is $230,000—$322,000 USD. In addition to base salary, this job is eligible to receive equity in the form of restricted stock units, and depending on the position offered, it may also be eligible to receive a commission.