Staff Machine Learning Engineer, Ads Ranking

unlimited holidays - extra parental leave - work from home - fully flexible
Work set-up: 
Full Remote
Contract: 
Full time
Experience: 
Senior (5-10 years)
Work from: 
United States

Offer summary

Qualifications:

7+ years of industry experience in applied machine learning., Deep expertise in deep neural network architectures and frameworks like TensorFlow and PyTorch., Strong background in recommendation systems, ad ranking, or related domains., Experience working with large-scale datasets and complex feature pipelines..

Key responsibilities:

  • Design and train advanced machine learning models for Reddit Ads Ranking.
  • Develop and optimize features such as embeddings and contextual signals.
  • Collaborate with product, infrastructure, and data teams for model deployment and performance analysis.
  • Mentor other machine learning engineers and contribute to modeling best practices.

Reddit logo
Reddit Internet Unicorn http://redditinc.com
1001 - 5000 Employees
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Job description

Reddit is a community of communities. It’s built on shared interests, passion, and trust and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 101M+ daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit redditinc.com.

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

 

 

Pay Transparency:

This job posting may span more than one career level.

In addition to base salary, this job is eligible to receive equity in the form of restricted stock units, and depending on the position offered, it may also be eligible to receive a commission. Additionally, Reddit offers a wide range of benefits to U.S.-based employees, including medical, dental, and vision insurance, 401(k) program with employer match, generous time off for vacation, and parental leave. To learn more, please visit https://www.redditinc.com/careers/.

To provide greater transparency to candidates, we share base pay ranges for all US-based job postings regardless of state. We set standard base pay ranges for all roles based on function, level, and country location, benchmarked against similar stage growth companies. Final offer amounts are determined by multiple factors including, skills, depth of work experience and relevant licenses/credentials, and may vary from the amounts listed below.

The base pay range for this position is:
$230,000—$322,000 USD

In select roles and locations, the interviews will be recorded, and transcribed and summarized by artificial intelligence (AI). You will have the opportunity to opt out recording, transcription and summarization prior to any scheduled interviews.

During the interview, we will collect the following categories of personal information: Identifiers, Professional and Employment-Related Information, Sensory Information (audio/video recording), and any other categories of personal information you choose to share with us. We will use this information to evaluate your application for employment or an independent contractor role, as applicable.  We will not sell your personal information or disclose it to any third party for their marketing purposes.  We will delete any recording of your interview promptly after making a hiring decision.  For more information about how we will handle your personal information, including our retention of it, please refer to our Candidate Privacy Policy for Potential Employees and Contractors.

Reddit is proud to be an equal opportunity employer, and is committed to building a workforce representative of the diverse communities we serve.  Reddit is committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. If, due to a disability, you need an accommodation during the interview process, please let your recruiter know.

Required profile

Experience

Level of experience: Senior (5-10 years)
Industry :
Internet
Spoken language(s):
English
Check out the description to know which languages are mandatory.

Hard Skills

Machine LearningTensorFlowPyTorch (Machine Learning Library)Deep LearningControlled ExperimentsVery Large Databases (VLDB)Recommender SystemsFeature EngineeringAd Serving

Other Skills

  • Problem Solving
  • Mentorship
  • Collaboration
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