Systems | Development | Analytics | API | Testing

Sealed classes are a special kind of class in Kotlin, used to create restricted hierachies — where the full list of sub-classes is strictly limited, and known in advance. This is particularly useful when we want to enhance the power of Kotlin’s when statement, model a type that has a fixed set of possible variations, or represent a fixed group of states or outcomes (such as network responses, UI states and form validations).

It’s one thing to build an app. It’s another to make sure it actually works the way people expect – on real iPhones, in the wild, under all kinds of conditions. That’s where iOS app testing comes into play. Crashes, broken layouts… these are the kinds of things that can tank your reviews fast. If you want to avoid that, you need to test the app properly. And that’s exactly what we’re going to walk you through in this short guide.

Jetpack Compose is Android’s modern UI toolkit. It unifies and simplifies the experience by consolidating state and logic in the rendering with a more declarative approach. Among its most notable features is a powerful animation framework that helps developers create fluid and performant animations with ease. Jetpack Compose allows you to easily inject animations into your UI, which is a great way of providing visual feedback and enhancing interactions that directly affect the user experience.

Swift extensions are one of the most useful tools in iOS development, allowing us to add new functionality to existing types without subclassing or rewriting code. In this guide, we’ll break down how extensions work, why they matter, and how to use them effectively. You’ll learn: By the end, you’ll know how to use extensions to write cleaner, faster, and more maintainable Swift code.

It is surprising how much of your data is truly out there. If you don’t believe us, simply type your name or alias into Google. Everything, from old forum posts and cached resumes to even leaked private information, can be commonly found with just a simple search query. This is very common for individuals in all industries, but especially for developers.

Swift Composable Architecture (TCA) is one of the cleanest and most scalable ways to build iOS and macOS apps today. Created by Point-Free, it pulls together state management, side effects, dependency injection, and modular design into one consistent and predictable system. Whether we’re crafting a tiny feature or designing a full-scale app, TCA helps us write Swift code that’s easier to test, easier to work out, and a lot less painful to maintain over time.

Did you know more than half of users will bail if your app doesn’t load in under three seconds? That’s not a fun stat. But it’s real, and it shows up fast, especially in high-traffic moments. Take an e-commerce app during a big sale. One delay during checkout, one stutter when loading the cart, and users are gone. That team watched retention nosedive because mobile app performance didn’t hold up under pressure. The problem wasn’t the features. It was the lag.