We’re looking for a Staff Machine Learning Engineer to join Reddit’s Ads Ranking Org! This role is part of a broader effort to enhance Reddit’s ML-powered ad ranking systems through improved model architectures, contextual embeddings, and conversion-optimized modeling. This position allows the opportunity to contribute across key modeling focus areas such as conversion, app ads, shopping, brand ads, or core ranking.
What you bring:
- 7+ years of industry experience, including several years in applied ML roles
- Deep experience with DNN 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
Day-to-Day Responsibilities:
- 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.)
Most Challenging Aspects:
- Balancing generalization and specificity in modeling across different ad formats
- Managing trade-offs between model complexity, latency, and prediction quality
- Navigating cross-functional alignment to scale high-impact ML initiatives
What Differentiates This Role:
- Direct path to measurable product and revenue impact
- Opportunity to shape foundational ML modeling across Reddit Ads
- Flexible scope based on modeling strengths (conversion, app ads, core ranking, etc.)
- Exposure to diverse ad surfaces (feed, video, shopping, brand) and cutting-edge ML techniques
What We Offer:
- A dynamic, supportive work environment with a diverse team of engineers and cross-functional partners
- Opportunities for professional growth and development, with a focus on continuous learning and skill-building
- A competitive salary and benefits package, with a focus on work-life balance and employee well-being
- Flexible work arrangements, including remote work options, to support your individual needs and preferences
- The chance to work on high-impact projects that drive real results for our users and advertisers
Benefits:
- Comprehensive Healthcare Benefits and Income Replacement Programs
- 401k Match
- Family Planning Support
- Gender-Affirming Care
- Mental Health & Coaching Benefits
- Flexible Vacation & Reddit Global Days Off
- Generous paid Parental Leave
- Paid Volunteer time off
#LI-Remote
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