Senior Staff Machine Learning Systems Engineer, Feed Relevance
As a Senior Staff Machine Learning Systems Engineer, you will lead the vision and architecture for the high-performance systems powering Reddit's Home Feed. This role focuses on owning real-time serving pipelines, low-latency candidate retrieval, and data fetching layers to enable personalized experiences for millions of users.
Reddit is a community of communities, built on shared interests, passion, and trust. It 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 126 million daily active unique visitors, Reddit is one of the internet’s largest sources of information.
The Feed Relevance team is responsible for the end-to-end systems that power personalization and ranking for the main Reddit feeds. The team prioritizes building scalable, extensible, and highly performant personalization systems to improve the user experience and drive key business metrics.
As a Senior Staff Machine Learning Systems Engineer, you will help define and lead the vision for the systems that power the Reddit Home Feed. While this role sits within the Feed Relevance team, it is primarily a systems architecture and backend engineering position rather than a modeling role. We are looking for a distributed systems expert to own the 'engines' of personalization—the real-time serving pipelines, low-latency candidate retrieval systems, and high-throughput data fetching layers that allow our models to impact millions of users in milliseconds.
Posted June 2, 2026