Staff ML Platform Engineer - AWS, LLMs & Production

AppFolio Inc. is hiring a Staff Machine Learning Engineer in Denver, hybrid. You will advance our ML platform, design and operate infrastructure on AWS, including ECS and SageMaker, with GPU fleets and scalable model serving. You'll optimize costs, maintain multi-provider LLM access (Google, OpenAI, Anthropic), and build end-to-end training and fine-tuning pipelines for LLMs. The role demands 7+ years in web app development, SaaS experience, and strong Python/Docker/CI/CD practices.