Under the River
Shopify built River, an AI coding agent living in company Slack that reads code, runs tests, and opens pull requests. One in eight merged PRs at Shopify is now coauthored by River. The post details Aquifer, the internal agent platform beneath it, treating session durability as the core primitive.

Building production-ready agentic systems: Lessons from Shopify Sidekick
Shopify engineers share architectural insights from developing Sidekick, including Just-in-Time instructions for managing 50+ tools, LLM evaluation frameworks calibrated to human judgment, and Group Relative Policy Optimization training.


Under the River
Shopify built River, an AI coding agent living in company Slack that reads code, runs tests, and opens pull requests. One in eight merged PRs at Shopify is now coauthored by River. The post details Aquifer, the internal agent platform beneath it, treating session durability as the core primitive.

Building production-ready agentic systems: Lessons from Shopify Sidekick
Shopify engineers share architectural insights from developing Sidekick, including Just-in-Time instructions for managing 50+ tools, LLM evaluation frameworks calibrated to human judgment, and Group Relative Policy Optimization training.