Lucas van Dongen

The top application in the travel section of the App Store and worldwide market leader for accommodations. Used by millions of people globally every day. I worked on a very large-scale project in terms of developers, lines of code (1.5 million), tooling, release schedule (twice per week), amount of daily users, and transactions.

I used SwiftUI and Swift with MVVM in our own module and interacted with older implementations in UIKit and Objective-C. A notable achievement is I created the roadmap for modernizing the dependency injection implementation that is being rolled out in the coming years. There was a heavy accent on Clean Code and designing complex interactions with the back end while cleaning up older code.

Steady is an app geared toward finding jobs in the gig economy in the US. The quality standards were very high—with over a million concurrent users and frequent releases. I worked in a team of iOS and Android developers and managed to be the top contributor in terms of velocity.

The project was a model–view–viewmodel using Reactive paradigms through ReactiveKit, comparable to RxSwift and Combine.

ClockAssist is a suite of applications where a desktop client that tracks your activities, a web client, and mobile clients allow you to automatically register all your activities during the day, like sending emails, making bills, editing documents, or having phone calls.

This saves valuable time for professionals like lawyers, accountants, or software developers who have to declare their worked hours while it also helps register them far more accurately.

I've worked as a contractor for Duolingo (a language training application) through Toptal. Duolingo has millions of users, supports many languages, and has up to a dozen A/B experiments running at any time. Any step of the development, build, and deployment process that could be automated was automated.

Ovo Timer is a beautiful, quick, and easy-to-use timer application for iOS devices. It has beautiful hand-rendered animations and has been in the App Store for almost a decade. It's the oldest piece of software I still support.

This application is an OS X conversion of the Windows Scanmodule for Mediq Medeco that can be used with a barcode scanner and allows pharmacies to restock items quickly.

The project involved refactoring all logic and data handling as much as possible to separate the "core" project and get as much reuse as possible when integrating the core into the OS X version. This version was based on Xamarin.

Xamarin saved much time and allowed the team to keep a shared codebase. Getting the scanner to work via a bridge was quite challenging and very interesting.