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Let me tell you about the time our iOS app got so slow that users could literally say "I'm hungry" three times while waiting for it to load. Not cool for a food delivery app. Here's the messy, real-world story of how Doordash fixed similar Issue. Our "before" and "after" metrics - that downward slope never looked so beautiful The Wake-Up Call It started when their analytics showed: 4.2 second average cold start time (yikes!) 1 in 3 users tapping repeatedly like that would help App Store reviews saying "slow as molasses in January" Turns out when people want food, they want it NOW. Who knew? What Was Making them Slow After digging in with Instruments (and several nervous breakdowns), they found: SDK Overload: 18 - yes EIGHTEEN - analytics packages loading at launch Storyboard Spaghetti: UI files so big they made Xcode cry Eager Beaver Network Calls: Fetching data we didn't need yet Font Fiasco: ...

Imagine building a house where every room is designed by a different architect, each using their own unique blueprint. Now, imagine trying to make all those rooms feel like they belong to the same home. This is the challenge Airbnb faced with its iOS app, where multiple UI frameworks and legacy codebases created inconsistency and inefficiency. Enter SwiftUI , Apple’s declarative UI framework, which promised to streamline development and unify the user experience. In this blog post, we’ll explore how Airbnb embraced SwiftUI, the technical challenges they overcame, and the lessons they learned along the way. Whether you’re an iOS developer, a product manager, or a tech enthusiast, this deep dive will provide valuable insights into modern UI development. Why SwiftUI? SwiftUI, introduced by Apple in 2019, is a declarative framework for building user interfaces across Apple platforms. Unlike UIKit, which uses an imperative approach, SwiftUI allows developers to describe wh...

Lyft’s iOS Testing Revolution: How They Made Testing Less Awful (And Why It Worked) Let's be honest - iOS testing sucks. You write these giant test suites that take forever to run, then they break when someone changes a button color. Lyft's mobile team felt this pain BIG TIME - until they invented something called Focus Flows. Here's the messy story of how they fixed testing without making everyone hate their jobs. Not gonna lie - even their diagrams look better than most apps The Testing Nightmare Back in 2021 Lyft's iOS situation was rough: Test suites took 45+ minutes to run (coffee break anyone?) Flaky tests failed 30% of builds for no reason New devs needed 2 days just to understand the test setup One engineer joked: "Our tests tested our patience more than our code." Not ideal when you're trying to fix ride-sharing bugs at scale. The Breaking Point Three things forced change: 1. A critical payment bug slipped through test...