Senior Machine Learning Systems Engineer, Ads ML Experience Platform

Reddit, Inc. is a large online community platform hosting millions of active users and communities. They are seeking a Senior Machine Learning Systems Engineer to build and enhance large-scale ML experimentation and training orchestration platforms, as well as develop agentic AI execution systems to accelerate the Ads ML lifecycle through scalable and automated tooling.

Responsibilities:

• Design and build large-scale offline ML experimentation platforms that enable reproducible research, model development, evaluation, and promotion workflows
• Develop production-grade training orchestration frameworks supporting distributed training, hyperparameter optimization, model evaluation, and automated retraining
• Build infrastructure for experiment tracking, metadata management, lineage, artifact versioning, model registries, and reproducibility
• Partner with ML engineers and researchers to improve experimentation velocity and operational efficiency
• Build automated workflows for model promotion, rollback, compliance validation, and continuous evaluation
• Design and build an agentic AI execution platform supporting autonomous and human-in-the-loop workflows, including multi-agent orchestration, memory/context systems, and scalable workflow infrastructure