Staff Machine Learning Engineer

Reddit is a community of communities built on shared interests, passion, and trust. It hosts 100,000+ active communities and approximately 130 million daily active unique visitors.

Reddit is looking for a Staff-level Machine Learning Engineer to join the App Ads Modeling team within the Ads Ranking Org. This role focuses on enhancing Reddit's ML-powered ad ranking systems through improved model architectures, contextual embeddings, and conversion-optimized modeling.

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

• 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

• Experience with conversion modeling, app ads, or performance/brand ads
• Experience in ads marketplaces at peer companies
• Publications, patents, or industry contributions in applied ML or ranking systems

Base salary range: $230,000—$322,000 USD. Eligible for equity in the form of restricted stock units, and possibly commission. Benefits include comprehensive healthcare, income replacement programs, 401k with employer match, global benefit programs, family planning support, gender-affirming care, mental health & coaching benefits, flexible vacation & paid volunteer time off, and generous paid parental leave.

100% remote opportunity; Reddit has office locations in NY, SF, LA, and Chicago for hybrid/onsite preference.