In the article From Four Wheels to Two RJ Marsan talks about the Lyft engineering team’s principles for quickly and safely adding major features to a mobile codebase. It’s full of interesting learnings as they went through the process of adding scooter rentals to the app. Here’s a good point about trying to avoid doing everything in the first release of a new feature:

Every new feature is a chance to start with a clean slate, and it’s often tempting to immediately build for scale. We all want our products to launch to massive fanfare and usage, but more often than not, the path to success for new features is slow and steady. With steady growth in mind, we designed our first architecture to support exactly what’s needed for our first product iteration, and nothing more. For Lyft Scooters, we cut out many features one might expect from a classic ride such as sharing ETA or setting a destination.