Building uReview, Uber’s Multi-Agent Code Review Engine — Will Bond & Ameya Ketkar, Uber
Aug 28, 2026 · 15:07
Will Bond and Ameya Ketkar explain how Uber built uReview, its multi-agent code review engine, to fight a growing review bottleneck: first-review wait times at Uber grew from 3 hours in 2024 to 9 hours in 2026. They describe why Uber built rather than bought (most vendors don't support Phabricator) and how they made the system work by measuring reply sentiment, addressal rate, and agent trajectory, since 'the model never knows that it's wrong.' Letting hundreds of teams write their own reviewers was easy to author but hard to run cheaply at scale. Results: uReview posts about 25,000 comments a week, roughly 67% get addressed, costs fell 60% versus the naive first build, and quality and accuracy rose 70%. They close by arguing the agentic shift is expanding rather than killing the human outer loop, moving engineers from implementation details to architecture and product thinking.
