Senior Machine Learning Engineer
Core
Design, build, and productionalize machine learning and Generative AI capabilities for large-scale ecommerce applications, powering intelligent experiences for millions of buyers and sellers.
Role type
Senior IC machine learning engineer (foundation models & GenAI)
Builds
Production-grade AI systems including LLMs, retrieval-augmented generation, embeddings, multimodal models, ranking, and personalization for the eBay marketplace.
Domain
Ecommerce / Generative AI / Foundation Models
Deliverable
production ML models
Required skills
Machine learning system design and deployment, Large Language Models (LLMs), neural architectures, embeddings, retrieval, ranking, multimodal modeling, reinforcement learning, feedback-driven learning systems, Python, PyTorch, TensorFlow, scalable data processing, distributed systems, cloud infrastructure, model-serving platforms
Preferred skills
Experience with preference learning, reward modeling, bandits, continuous model improvement loops, structured experimentation, peer review
Technologies
PyTorch, TensorFlow, Python
Responsibilities
Design and build ML/GenAI systems for ecommerce, optimize systems involving LLMs and retrieval, develop learning systems from feedback signals, partner with researchers to productionize prototypes, build training/fine-tuning/deployment pipelines, improve model quality/latency/cost/reliability, integrate AI into platform experiences, apply software engineering best practices, raise technical standards through experimentation and documentation
Seniority
Senior, hands-on IC
