Principal Machine Learning Engineer

AppFolio is seeking a Principal Machine Learning Engineer to lead the development of AI systems within Realm-X, their AI-native platform for property management. The role involves architecting and scaling intelligent AI agents, improving end-to-end ML systems, and driving the transition to autonomous property management operations. You'll work at the intersection of traditional ML, deep learning, and generative AI.

• Architect and lead the technical vision for AI systems across Realm-X in partnership with senior leadership.
• Design and deploy advanced AI Agentic systems including multi-agent orchestration across specialist agents.
• Establish platform primitives and abstractions for context-aware, action-oriented AI.
• Architect and build scalable, multi-modal, and real-time AI applications.
• Drive AppFolio's transition toward autonomous property management operations using LLMs, fine-tuning, and RL optimization.
• Build data and feedback loops for Reinforcement Learning over agent action policies.

• Master's or Ph.D. in Computer Science, Machine Learning, or related field.
• 10+ years of experience building software systems with significant focus on ML/AI.
• Combined academic and industry track record: published research and shipped production systems.
• Deep ML expertise: Traditional ML, Deep Learning, and Generative AI/LLMs (prompting, fine-tuning, RAG, agents).