Senior Staff Machine Learning Engineer (Notifications)

Role Overview

Join Reddit as a Senior Staff Machine Learning Engineer (Notifications). You will design and implement content discovery algorithms to improve user experience, and lead the vision for the Notifications relevance team as the primary ML domain expert.

Key Responsibilities

• Drive the roadmap and vision for Notifications relevance.
• Build and improve core recommendation capabilities, including:
  • candidate retrieval
  • ranking models
  • recommendation/serving budget optimization
• Collaborate with multiple teams and act as the key ML domain expert.
• Mentor senior engineers and guide scalable improvements over the long term.
• Engage deeply with the Reddit Notifications product to inform algorithmic decisions.

Requirements

• 10+ years of industry experience with deep expertise in large-scale recommendation systems; notifications experience preferred.
• Proven ability to identify high-impact opportunities, define roadmaps, and drive scalable improvements.
• Strong experience building and deploying large-scale ML models using PyTorch or TensorFlow.
• Proficiency in object-oriented programming, including Python and Golang.
• Experience working with LLMs in production and using generative AI to augment recommendation systems.

Nice to Have

• Experience building production Agentic AI frameworks.
• Experience with state-of-the-art model architectures.
• Notifications relevance/experience as a domain.