Staff Machine Learning Engineer, App Ads Modeling

Reddit is seeking a Staff-level Machine Learning Engineer to join its Ads Ranking Organisation. The successful candidate will design and train advanced ML models to power Reddit Ads Ranking, develop and optimise features, and work closely with product, infra, and data teams.

Responsibilities:

• Design and train advanced ML models (e.g., DNNs, transformers) to power Reddit Ads Ranking
• Develop and optimise features including embeddings, contextual signals, and cross-session behaviour
• Work closely with product, infra, and data teams to drive end-to-end model deployment and performance analysis
• Mentor other MLEs and contribute to modelling best practices across the organisation
• Shape the long-term modelling vision across one or more domains (conversion, app ads, shopping, brand, etc.)

Required Qualifications:

• 7+ years of industry experience, including several years in applied ML roles
• Strong experience with Deep Learning architectures and ML frameworks (TensorFlow, PyTorch)
• Strong background in recommendation systems, ads ranking, or similar domains
• Experience working with large-scale datasets and complex feature pipelines
• Strong problem-solving and experimentation skills
• State of the Art models for Ads or Recsys experience (ex: Transformers, Recsys)
• Knowledge about Recsys or Ads funnel
• Track record of delivering high-impact models in production settings
• Comfort collaborating with infra and data teams on feature serving and training pipelines

Benefits:

• 100% remote opportunity
• 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