Senior Machine Learning Systems Engineer, Ads ML Experience Platform

Reddit is seeking a Senior Machine Learning Systems Engineer to join the Ads ML Experience Platform team. The team is building the next generation of ML research tools and agentic AI platforms that power machine learning development across Reddit.

The successful candidate will design and build large-scale offline ML experimentation platforms, develop production-grade training orchestration frameworks, and build infrastructure for experiment tracking, metadata management, and model registries.

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.

Requirements:

• 5+ years in infrastructure/platform engineering or large-scale distributed systems.
• 2+ years of hands-on experience building and operating production ML infrastructure, developer SDKs, platform APIs, or self-service AI tooling.
• Experience building workflow orchestration systems, developer platforms, or large-scale automation frameworks.
• Experience with distributed data processing systems such as Spark, Flink, Ray, or equivalent technologies.
• Experience with modern orchestration and workflow technologies such as Kubeflow, Argo, Airflow, or similar frameworks.
• Experience building offline ML experimentation platforms, model registries, experiment tracking systems, or training orchestration frameworks.
• Experience building and operating agentic AI systems is a strong plus.

Benefits:

• Medical, dental, and vision insurance
• 401(k) program with employer match
• Generous time off for vacation and parental leave

Salary: $216,700-$303,400 USD