Coinbase Says Roughly 100% of Merged Code Is Now AI-Generated, and Rebuilt Its Engineering Interview Around That
Coinbase published a post-mortem on a year of rebuilding its engineering interview loop, with the underlying data as the headline: AI-generated code was 5.7% of merged code in Q1 2025, crossed 50% for the first time in Q4 2025, and now sits at roughly 100% with humans still reviewing everything. The interview now tests how candidates direct AI, evaluate its output, catch architectural mistakes, and exercise judgment where models fall short, on the stated logic that they cannot hire engineers to work alongside AI while selecting for the ability to work without it. This lands about three months after Coinbase cut 14% of staff and replaced managers with player-coaches — the same company converting an AI productivity claim into both a headcount decision and a hiring-bar rewrite, which is the rare case where the displacement narrative comes with a numerator and a denominator.
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