Vercel built its new Queues durable event streaming product entirely with Cursor's AI coding agents, using them to write code and test it end-to-end against real AWS environments (DynamoDB, Kinesis). Engineer Joe Haddad credits Cursor's harness, context management across long compacting agent sessions, and model-switching (Claude Opus 4.5, GPT-5.4) for the results. Vercel's heaviest Cursor users saw 54% higher PR throughput, 89% lower PR cycle time, and 104 hours saved per developer annually. Cursor adoption has also expanded to product managers who use it for product analytics and shipping small fixes without engineering resources.
Table of contents
# Cursor offers the best harness and developer experience# Access to all the best models# Intelligent context management# A unified workspace for the entire software lifecycle# Building Vercel Queues with Cursor# Measuring impact# Expanding beyond engineering and turning PMs into builders405 Impressions