--- title: When Speed Wasn’t About Coding Faster: Our Journey to... description: Mercari's Shops & Ads Mobile Enabling team shares their 'One Person One Release' experiment, where a single engineer owns a feature end-to-end across iOS and... canonical: https://daily.dev/posts/when-speed-wasn-t-about-coding-faster-our-journey-to-one-person-one-release--sxsve1xch twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: When Speed Wasn’t About Coding Faster: Our Journey to ‘One Person One Release’ | daily.dev og:description: Mercari's Shops & Ads Mobile Enabling team shares their 'One Person One Release' experiment, where a single engineer owns a feature end-to-end across iOS and... og:url: https://daily.dev/posts/when-speed-wasn-t-about-coding-faster-our-journey-to-one-person-one-release--sxsve1xch og:image: https://api.daily.dev/og/posts/SXSvE1xCh.png og:image:alt: When Speed Wasn’t About Coding Faster: Our Journey to ‘One Person One Release’ og:image:width: 1200 og:image:height: 630 og:locale: en --- [Mercari Engineering](https://daily.dev/sources/mercari) [Read post](https://api.daily.dev/r/SXSvE1xCh) # [When Speed Wasn’t About Coding Faster: Our Journey to ‘One Person One Release’](https://api.daily.dev/r/SXSvE1xCh "Go to post") Mercari's Shops & Ads Mobile Enabling team shares their 'One Person One Release' experiment, where a single engineer owns a feature end-to-end across iOS and Android. The bottleneck wasn't coding speed but coordination overhead — aligning specs, API contracts, and platform conventions across multiple engineers. By having one engineer own the full delivery, supported by pair programming and AI agents (for PR translation and boilerplate generation), the team shipped faster with fewer inconsistencies. For complex features, they evolved from translating PRs between platforms to generating both iOS and Android implementations from a shared prompt and spec. Key lessons: inconsistent architecture surfaces immediately under this model, systems thinking improves, and AI tools work best with strong structural guardrails. [#mobile](/tags/mobile "Check all #mobile posts")[#productivity](/tags/productivity "Check all #productivity posts")[#ai-coding](/tags/ai-coding "Check all #ai-coding posts")[#company-culture](/tags/company-culture "Check all #company-culture posts") Aug 06•10m read time•From [engineering.mercari.com](https://api.daily.dev/r/SXSvE1xCh "engineering.mercari.com") [](https://api.daily.dev/r/SXSvE1xCh "Go to post") Table of contents [Introduction](https://api.daily.dev/r/SXSvE1xCh "Introduction")[The Hidden "Coordination Tax"](https://api.daily.dev/r/SXSvE1xCh "The Hidden "Coordination Tax"")[Starting Small: The First Experiment](https://api.daily.dev/r/SXSvE1xCh "Starting Small: The First Experiment")[Turning an Experiment into a Habit](https://api.daily.dev/r/SXSvE1xCh "Turning an Experiment into a Habit")[Applying ‘One Person One Release’ philosophy to Real, Complex Features](https://api.daily.dev/r/SXSvE1xCh "Applying ‘One Person One Release’ philosophy to Real, Complex Features")[What We Learned About Engineering Through ‘One Person One Release’](https://api.daily.dev/r/SXSvE1xCh "What We Learned About Engineering Through ‘One Person One Release’")[Moving Forward](https://api.daily.dev/r/SXSvE1xCh "Moving Forward") 321 Impressions Comment Bookmark Copy Share your thoughtsPost [](https://daily.dev/sources/mercari) [Mercari Engineering](https://daily.dev/sources/mercari "https://daily.dev/sources/mercari") Mercari's platform is a resource for developers and technology enthusiasts, offering insights into e... 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