Reddit hiring Senior Machine Learning Engineer, LS Embedding • Remote (Work from Home) | Himalayas
RedditRE

Senior Machine Learning Engineer, LS Embedding

"The front page of the internet,” Reddit brings over 430 million people together each month through their common interests, inviting them to share, vote, comment, and create across thousands of communities.

Reddit

Employee count: 501-1000

Salary: 217k-303k USD

United States only
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.

About the Team

The LS Embedding team focuses on developing highly expressive, multi-entity embeddings to enhance Reddit’s recommendation systems. We go beyond standard two-tower architectures, leveraging graph-based modeling, Graph Neural Networks (GNNs), and transformer-based architectures to capture complex interactions between users and entities. Our work directly impacts personalization and relevance across Reddit’s platform.

About the Role

We are seeking a Senior Machine Learning Engineer to design, develop, and optimize graph-based ML models for large-scale recommendation systems. You will work on embedding generation, distributed training, and scalable serving architectures, playing a key role in improving Reddit’s AI-powered personalization. This role offers the opportunity to contribute to cutting-edge ML research and apply it at scale in a high-impact production environment.

Responsibilities

  • Design and implement scalable, high-performance machine learning models using Graph Neural Networks (GNNs), transformers, and knowledge graph approaches.
  • Develop and optimize large-scale embedding generation pipelines for Reddit’s recommendation systems.
  • Collaborate with ML infrastructure teams to enable efficient distributed training (multi-GPU, model/data parallelism) and low-latency serving.
  • Work closely with cross-functional teams (Ads, Feed Ranking, Content Understanding) to integrate embeddings into various personalization and ranking systems.
  • Drive feature engineering efforts, identifying and curating expressive raw data to enhance model effectiveness.
  • Monitor, evaluate, and improve model performance using A/B testing, offline metrics, and real-time feedback loops.
  • Stay up-to-date with the latest research in GNNs, transformers, and representation learning, bringing new ideas into production.
  • Participate in code reviews, mentor junior engineers, and contribute to technical decision-making.

Qualifications

  • 5+ years of experience in machine learning engineering, with a strong focus on recommendation systems, representation learning, and deep learning.
  • Hands-on experience with Graph Neural Networks (GNNs), collaborative filtering, and large-scale embeddings.
  • Proficiency in Python and experience with ML frameworks such as PyTorch Geometric (PyG), Deep Graph Library (DGL), TensorFlow, or JAX.
  • Strong understanding of graph theory, network science, and representation learning techniques.
  • Experience building distributed training and inference systems using ML infrastructure components (data parallelism, model pruning, inference optimization, etc.).
  • Ability to work in a fast-paced environment, balancing innovation with high-quality production deployment.
  • Strong communication skills and the ability to collaborate cross-functionally with engineers, researchers, and product teams.

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

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:
$216,700$303,400 USD

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.

About the job

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Posted on

Job type

Full Time

Experience level

Senior

Salary

Salary: 217k-303k USD

Location requirements

Hiring timezones

United States +/- 0 hours

About Reddit

Learn more about Reddit and their company culture.

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"The front page of the internet,” Reddit brings over 430 million people together each month through their common interests, inviting them to share, vote, comment, and create across thousands of communities. Come for the cats, stay for the empathy.

Founded by Steve Huffman and Alexis Ohanian in 2005, Reddit is an online community where users submit, vote, and comment on content, news, and discussions. Nicknamed "the front page of the internet,"​ Reddit is one of the top ten sites in the United States (source: Alexa) with 130k+ communities and 430M+ users each month on desktop, mobile web, and our official Android/iOS apps.

Reddit is home to thousands of communities, endless conversation, and authentic human connection. Whether you're into breaking news, sports, TV fan theories, or a never-ending stream of the internet's cutest animals, there's a community on Reddit for you.

Employee benefits

Learn about the employee benefits and perks provided at Reddit.

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Personal & professional development

Personal & professional development funds.

Paid parental leave

Family planning funds & 4+ months paid parental leave.

Comprehensive health benefits

Medical, dental, and vision insurance for employees and dependents.

Equity benefits

Every employee gets equity, so you are rewarded for your best work.

View Reddit's employee benefits
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Reddit

Company size

501-1000 employees

Founded in

2005

View company profile

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