How Shopify turns open models into task experts

Our short summary of Shopify’s engineering write-up. The full story, with all the detail, is on their blog.

Problem

Token‑heavy tasks cost too much and run slowly on the main model.

Created specialized sub‑agents by post‑training open models with a continual learning loop and an LLM judge, then swapped them in for the main model.

7× faster, 90% cheaper

Want the architecture, code and numbers? They’re in the original post.