Senior Machine Learning Infrastructure Engineer (AI)

Location: Remote - United States

Salary: $190,800–$267,100 USD annually, plus potential equity and commission depending on the position offered.

Company

Reddit is a large-scale online community platform with over 100,000 active communities and approximately 130 million daily active unique visitors.

What you will do

• Design, train, and improve large-scale machine learning systems for recommendation and personalization.
• Own major ML system components end to end, from problem framing through production rollout.
• Build and optimize pipelines covering data preparation, feature generation, training, evaluation, and deployment.
• Improve distributed training, model efficiency, and online inference performance.
• Apply sequence modeling and foundation-model techniques to Reddit use cases.
• Develop reliable low-latency serving, monitoring, experimentation, and feedback-loop systems in collaboration with product, relevance, ads, and core ML teams.

Requirements

• 5+ years of experience in machine learning engineering, focused on large-scale ML infrastructure and recommendation or personalization systems.
• Expertise in modern deep learning architectures, including sequence models and foundation models.
• Experience building or scaling ML platforms for large datasets and high-traffic production environments.
• Understanding of distributed training and inference, including data, model, or pipeline parallelism.
• Proficiency in Python and modern ML frameworks such as PyTorch or TensorFlow.
• Strong software engineering, system design, debugging, testing, performance optimization, A/B testing, and model evaluation skills.

Culture & Benefits

• Comprehensive healthcare and income replacement programs.
• 401(k) with employer match.
• Global benefit programs supporting workspace, professional development, and caregiving.
• Family planning support, gender-affirming care, and mental health and coaching benefits.
• Flexible vacation, paid volunteer time off, and generous paid parental leave.
• Interviews may be recorded, transcribed, and summarized by AI, with an option to opt out before the interview.