Senior AI Engineer

SubcontractorHub is an AI-powered operating system designed for contractors in the home services industry. They are seeking a Senior AI Engineer to take ownership of AI features, bridging the gap between applied research and production systems, while ensuring production safety and technical leadership.

Responsibilities:

• Take AI features from problem framing and research prototypes through productization and post-launch monitoring
• Develop and orchestrate advanced multi-agent systems and LLM-based applications using LangGraph and Python
• Train, fine-tune, and evaluate models using PyTorch and Hugging Face (leveraging LoRA and PEFT techniques where appropriate)
• Build the evaluation harness alongside the feature. Handle dataset curation, define metrics, utilize LLM-as-judge approaches, and analyze agent trajectories
• Implement strict operational guardrails for a multi-tenant SaaS environment, including prompt injection defenses, PII handling, output validation, jailbreak prevention, and circuit breakers for agent loops
• Raise the engineering bar by writing clear, precise PR descriptions, technical proposals, and architecture notes that a distributed team can rely on