Stitch Fix seeks a Principal Full-Stack Data Scientist to design, develop, evaluate, and productionize foundational ML capabilities (client/item representations, embeddings, retrieval, ranking, recommendation) using large-scale behavioral, transactional, textual, and visual data. Requires 8+ years of ML experience, strong production-grade Python coding, experience with SQL and distributed processing (e.g., Spark), and familiarity with deep-learning frameworks (PyTorch or TensorFlow).