Senior Machine Learning Systems Engineer

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 130 million daily active unique visitors, Reddit is one of the internet's largest sources of information. The Machine Learning Platform team at Reddit is a high-impact team that owns the infrastructure that powers recommendations, content discovery, user and content quantification, while directly impacting other teams such as Growth, Ads, Feeds, and Core Machine Learning teams.

Responsibilities

Design end-to-end model lifecycle patterns (MLOps) to boost velocity of development for ML engineers, including data preparation, model management, experiment tracking, and more; Zero-to-one development and support of a graph ML codebase and platform that abstracts away common patterns and enables greater model scalability and iteration; Collaborate with ML engineers on performance tuning, including improving model training time, efficiency, and GPU training costs in a large, distributed ML training environment; Optimize batch data processing within a data warehouse and with tools such as Apache Beam, Apache Spark, Ray Data, and more; Architect pipelines to build and maintain massive graph data structures on the order of billions of nodes and tens of billions of edges

Requirements

5+ years of experience in ML infrastructure, including model training and model deployments; Hands-on experience with ML optimization, including memory and GPU profiling; Deep experience with cloud-based technologies for supporting an ML platform, including tools like GCP BigQuery, Google Cloud Storage, infrastructure-as-code (Terraform), and more; Hands-on experience administering and integrating MLOps tools for experiment tracking, model serving, and model registries (e.g. MLflow or Wandb); Proficiency with the common programming languages and frameworks of ML, such as Python, PyTorch, Tensorflow, etc.; Deep experience working with distributed training frameworks, including Ray and Kubernetes; Strong focus on scalability, reliability, performance, and ease of use; Strong organizational & communication skills

Nice to have

Experience working with graph databases (Neo4j, JanusGraph, TigerGraph) is a big plus; Experience working with graph neural networks (GNNs) and associated graph ML frameworks (PyTorch Geometric, Deep Graph Library) is a big plus

Benefits

Equity in the form of restricted stock units; Commission depending on position offered; Medical, dental, and vision insurance; 401(k) program with employer match; Generous time off for vacation; Parental leave