Mobile DevOpsBuild vs. buy for mobile release tooling: lessons from Monzo, Spotify, Tuist, and EtsySenior engineers from Monzo, Spotify, Tuist, and Etsy on when to build, when to buy, and what AI changesThere's no clean threshold for when to build vs. buy mobile release tooling. In a live panel, senior engineers from Monzo, Spotify, Tuist, and Etsy explained why the real cost is ongoing maintenance and coordination â not the first build â and why AI accelerates that trap rather than removing it.