The Machine Learning Engineer will be responsible for designing and implementing a global-scale machine learning system for feeds, ads, and search ranking models. The role involves improving the usability and flexibility of the machine learning infrastructure, enhancing model training and serving workflows, data pipelines, storage systems, and resource management for multi-tenancy machine learning systems. The engineer will also design and develop key components of ML infrastructure, mentor interns, and contribute to the overall advancement of the company's AI infrastructure and recommendation platform. This role demands a strong understanding of large-scale system development and experience with deep learning frameworks and core machine learning infrastructure.