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How Spotify Engineered a Seamless Build System Migration Without Disrupting Developers Imagine changing the foundation of a skyscraper while people continue working inside. That's essentially what Spotify's engineering team accomplished when they migrated their build systems without disrupting developer workflows. This remarkable technical feat enabled faster builds, improved tooling, and set the stage for future innovation. In this deep dive, we'll explore how Spotify planned and executed this complex migration, the challenges they overcame, and the valuable lessons they learned. Whether you're a build engineer, platform developer, or tech leader, this case study offers practical insights for managing large-scale infrastructure changes. Image Credit: Spotify Engineering Blog Why Spotify Needed to Migrate Build Systems Spotify's engineering team identified several compelling reasons for the migration: Performance Bottlenecks: Existing system c...

A sketch of Airbnb’s new iOS CI system. Imagine a bustling kitchen where chefs are preparing hundreds of dishes simultaneously. Now, imagine if every chef had to wait for a single oven to bake their dish. Chaos, right? This is the challenge Airbnb faced with its iOS development process, where a monolithic continuous integration (CI) system struggled to keep up with the growing complexity and scale of the codebase. Enter a flexible CI system , designed to handle the unique needs of Airbnb’s iOS team. In this blog post, we’ll explore how Airbnb reimagined its CI pipeline for iOS, enabling faster builds, better scalability, and improved developer productivity. Whether you’re an iOS developer, a DevOps engineer, or a tech enthusiast, this deep dive will provide valuable insights into building a modern CI system. The Problem with Monolithic CI Airbnb’s iOS codebase had grown significantly over the years, with hundreds of developers contributing to the app. The existing CI system, bu...

How GitHub Slashed iOS Testing Time with Innovative Runner Features Imagine waiting hours for your iOS app tests to complete, only to find out that a single test failed and you need to start over. For GitHub’s engineering team, this was a recurring challenge—until they introduced advanced runner features to their testing infrastructure. By optimizing their CI/CD pipeline, GitHub significantly reduced testing time, improved efficiency, and empowered developers to deliver high-quality iOS apps faster. In this blog post, we’ll explore how GitHub implemented these innovative runner features, the challenges they addressed, and the impact they had on their iOS development process. Whether you’re an iOS developer, a DevOps engineer, or a tech enthusiast, this story will inspire you to rethink how you approach testing in your projects. Image Credit: GitHub Engineering The Challenges of iOS Testing Before implementing the new runner features, GitHub’s iOS testing process faced seve...