Reddit

Senior Machine Learning Engineer, Ads ML Platform

Reddit$216K — $303K *
US-AnywhereRemote in United States
Information Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • Deep experience with ML systems in production environments.
  • Proven track record in enhancing training or serving efficiency with measurable results.
  • Strong judgment on optimization at various system levels.
  • Ability to manage complex projects and collaborate cross-functionally.
  • Strong customer focus with an eye for maintainability and future use.
  • Excellent communication skills for conveying technical tradeoffs.

Responsibilities

  • Own high-impact optimization projects across Ads ML training and inference.
  • Identify and diagnose production bottlenecks using profiling and benchmarking.
  • Develop performance tools and optimization frameworks for multiple teams.
  • Enhance launch safety and efficiency through robust operational practices.
  • Collaborate with model and platform teams to implement feasible solutions.
  • Guide team direction by identifying patterns and opportunities for automation.
  • Mentor junior engineers in technical skills and effective execution.

Benefits

  • Comprehensive healthcare and income replacement programs.
  • 401k plan with employer match.
  • Global benefits aligned with your lifestyle and professional growth.
  • Family planning support available.
  • Gender-affirming care offered.
  • Mental health resources and coaching benefits.
  • Flexible vacation policy and generous paid time off for volunteering.
  • Paid parental leave for family support.
Full Job Description
About the Role

We're building a scalable feature platform that powers Ads ML by making high-quality features and training datasets easy to build, share, and maintain. Our small but growing team works on projects like batch & realtime feature management platform, training set generation platform, sequence features platform and, agentic and automated ML workflows for feature lifecycle management.

We are looking for an engineer with deep experience in building high-scale data infrastructure and ML platforms to help evolve and scale our feature management systems.

What You'll Do
  • Design and build data infrastructure that supports large-scale feature and training set computation, transformation, and storage.
  • Develop frameworks for batch and real-time features with a focus on reliability, scalability, and ease of use.
  • Build platform capabilities for feature governance, including lineage tracking, validation, drift detection, anomaly monitoring, reproducibility, and versioning
  • Partner with ML engineers to ensure smooth integration of feature engineering workflows into ML production systems.
  • Build systems that support agentic ML workflows, including automated feature discovery, feature quality evaluation and feature lifecycle management
  • Drive architecture and technical direction for high-scale ML platform infrastructure powering ads ranking, targeting, and optimization systems.
  • Contribute to operational excellence through observability, performance tuning, reliability engineering, and cost optimization initiatives.

What You Bring
  • 5+ years in infrastructure/platform engineering or large-scale distributed systems.
  • 2+ years of hands-on experience building or operating ML platform infrastructure and production ML systems
  • Proficiency with large-scale feature computation frameworks (Spark, PySpark, or Scala).
  • Expertise in distributed systems (scaling, partitioning, fault tolerance, caching).
  • Experience building intelligent automation or agentic workflows for ML systems is a strong plus, including areas such as automated pipeline management, feature recommendations, evaluation systems, or AI-assisted developer tooling.
  • Experience with ML infrastructure and MLOps workflows spanning feature engineering, training pipelines, experimentation, model deployment, and online serving is a plus

Benefits:
  • 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


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 salary 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 salary range for this position is:

$216,700-$303,400 USD

In select roles and locations, the interviews will be recorded, transcribed and summarized by artificial intelligence (AI). You will have the opportunity to opt out of 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.

About Reddit

Reddit is an American social news aggregation, web content rating, and discussion website. Registered members submit content to the site such as links, text posts, images, and videos, which are then voted up or down by other members. Posts are organized by subject into user-created boards called "communities" or "subreddits", which cover topics such as news, politics, religion, science, movies, video games, music, books, sports, fitness, cooking, pets, and image-sharing. Submissions with more upvotes appear towards the top of their subreddit and, if they receive enough upvotes, ultimately on the site's front page. Although there are strict rules prohibiting harassment, it still occurs, and Reddit administrators moderate the communities and close or restrict them on occasion. Moderation is also conducted by community-specific moderators, who are not considered Reddit employees. As of September 2021, Reddit ranks as the 19th-most-visited website in the world and 7th most-visited website in the U.S., according to Alexa Internet. About 42–49.3% of its user base comes from the United States, followed by the United Kingdom at 7.9–8.2% and Canada at 5.2–7.8%. Twenty-two percent of U.S. adults aged 18 to 29 years, and 14 percent of U.S. adults aged 30 to 49 years, regularly use Reddit. Reddit was founded by University of Virginia roommates Steve Huffman and Alexis Ohanian, with Aaron Swartz, in 2005. Condé Nast Publications acquired the site in October 2006. In 2011, Reddit became an independent subsidiary of Condé Nast's parent company, Advance Publications. In October 2014, Reddit raised $50 million in a funding round led by Sam Altman and including investors Marc Andreessen, Peter Thiel, Ron Conway, Snoop Dogg, and Jared Leto. Their investment valued the company at $500 million then. In July 2017, Reddit raised $200 million for a $1.8 billion valuation, with Advance Publications remaining the majority stakeholder. In February 2019, a $300 million funding round led by Tencent brought the company's valuation to $3 billion. In August 2021, a $700 million funding round led by Fidelity Investments raised that valuation to over $10 billion.
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