Senior Staff Machine Learning Engineer, Notifications

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 is one of the internet’s largest sources of information. 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). As a Senior Staff, you will design and build a large-scale system that powers end-to-end recommendation systems at 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. You will also 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; Mentor and guide senior and staff engineers in the team; Partner closely with senior leadership and cross-functional org leads to shape long-term roadmaps, balancing immediate operational wins with strategic technical objectives

Requirements

10+ years of industry experience with deep expertise in large-scale recommendation systems; 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 LLM in production and utilizing generative AI to augment recommendation systems; Proficiency in object-oriented programming (Python, Golang)

Nice to have

Notifications experience; Experience with state of the art model architectures; Experience building production Agentic AI frameworks

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 & Coaching Benefits; Flexible Vacation & Paid Volunteer Time Off; Generous Paid Parental Leave; Equity in the form of restricted stock units; Commission depending on position; Medical, dental, and vision insurance; Generous time off for vacation and parental leave