Isidor

Founded in September 2025, Isidor is an applied-research and product company focused on enterprise AI infrastructure. Its public job listings describe a small team working directly with frontier AI labs and enterprise customers, while LinkedIn currently labels the company “Isidor (acq. by Handshake AI).”

Isidor converts unstructured proprietary data into reinforcement-learning-ready curricula and builds systems for model evaluation, benchmarking, output verification, reasoning-trace capture, and foundation-model post-training. Its stated focus is the layer upstream of AI applications: making model behavior measurable, reproducible, and safer in specialized workflows.

The firm appears strongest in applied AI evaluation and data operations rather than general-purpose software. The roles advertised emphasize building evaluation pipelines, quality-control systems, model-in-the-loop and human-in-the-loop workflows, and custom integrations for research labs and enterprise clients.