Staff Machine Learning Engineer, Ads Ranking

Details

Reddit is a community of communities, built on shared interests, passion, and trust, hosting open and authentic discussions with over 100,000 active communities and 101M+ daily active unique visitors.

Role Overview

We are seeking a Staff Machine Learning Engineer to join Reddit’s 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. The position involves contributing across key modeling areas such as conversion, app ads, shopping, brand ads, and core ranking.

Responsibilities

• Design and train advanced ML models including DNNs and transformers to enhance Reddit Ads Ranking.
• Develop and optimize features like embeddings, contextual signals, and cross-session behavior.
• Collaborate with product, infrastructure, and data teams to manage end-to-end model deployment and performance analysis.
• Mentor other machine learning engineers and promote best modeling practices.
• Shape long-term modeling vision across various ad domains (conversion, app ads, shopping, brand).

Requirements

• 7+ years of industry experience with applied machine learning.
• Deep expertise with DNN architectures and frameworks such as TensorFlow and PyTorch.
• Strong background in recommendation systems, ads ranking, or related domains.
• Experience with large-scale datasets and complex feature engineering pipelines.
• Excellent problem-solving and experimentation skills.

Challenges

• Balancing model generalization with specificity across different ad formats.
• Managing trade-offs between model complexity, latency, and prediction accuracy.
• Aligning cross-functional teams to scale impactful ML initiatives.

Benefits

• Dynamic, supportive work environment with diverse teams.
• Professional growth opportunities focused on continuous learning.
• Competitive salary and focus on work-life balance.
• Flexible work arrangements including remote options.
• Comprehensive healthcare, 401k match, family planning, mental health, and other supportive benefits.

Salary

Base salary range: $230,000 - $322,000 USD per year.

Additional Information

• Eligible for equity (restricted stock units) and possible commission.
• Interviews may be recorded and transcribed with AI, with an opt-out option.
• Reddit is an equal opportunity employer and supports accommodations for disabilities.