🚀🔔Beginners guide to Web Push Notifications using Service Workers

Push notifications are very common in the native mobile application platforms like Android & iOS. The are most effective ways to re-engage users to your apps. In this post we will look at how to implement push…

API Design — Deriving Signal

In this article, we will explore three abstractions that are useful building blocks in asynchronous event handling. As a use case, we will build an API for registering callbacks to get notified of events. Working with callbacks might sound trivial at first. After all, it is just…

Introducing Flow — Asynchronous programming made easy

Today we are proud to announce the open sourcing of Flow, a Swift framework for building and maintaining complex asynchronous flows. Flow is modern, lightweight and composable, allowing you to write code that is more robust and easier to…

Tidy up Dropwizard and JDBI with Kotlin

Near the end of 2017, some developers at iZettle got together and started discussing the possibility of enterprise development with Kotlin. My team was starting up a new project and we all thought it would be a good opportunity to try our hands at Kotlin.

Hack Weeks at iZettle

When I am doing research on a company I want to work at, one of the things I look for is their approach towards employee motivation and training/education. For me, it is more important to have a proper educational plan than a slight increase on my base salary.

API Design — Deriving Lift

There have been many attempts to build Swift libraries for both parsing and generating JSON. The reason is probably that there is no obvious Swift solution and JSON parsing is something most developers have to frequently confront. Swift 4 introduced Codable with the promise to…

API Design — Deriving Future

In this article, we will explain what asynchronous operations are, why they are useful, and how their APIs are typically designed. Specifically, we will look at an API for performing network requests. Step by step, we will improve this API, first by introducing the Result<T>…

API Design — Expanding on Signals

When working with UI frameworks, it is very common with APIs that want to notify the user of changes of different kinds. In Apple frameworks, these are typically expressed through the use of notifications, target/action, delegates or registration of callback closures.

Web Animation and the Render Pipeline

Being a student of both design and development it sort of makes sense that I would find the…

Introducing Form — Layout, styling, and event handling