Under the brands, Web.de, GMX, 1und1, and Mail.com, United Internet AG offers email and cloud services that are used every day by millions of users on their iPhones. The white-label app has historically grown since 2010, and as part of the 10-person team, besides adding new features to the app, I refactored legacy code and increased test coverage.
Email and cloud access
email and cloud sync
multiple account management
D4L data4life gGmbH
The Data4Life app helps users manage their health, gain new knowledge, and contribute to research.
The biggest challenge in this project was to change the app's UI from UIKit to SwiftUI during ongoing development and change the overall architecture from VIPER to Composable Architecture. This was achieved by modularizing the app into over 50 Swift packages and then gradually transforming them.
In addition to the architecture and development part, the job involved coaching the staff in Composable Architecture and SwiftUI through pair programming and in-depth sessions.
Keep track of symptoms
Participate in studies
Store medical documents digitally
Swift Package Manager
The app SeeYa makes scheduling get-togethers with contacts a breathe. To do this, users write a few words about what they want to do, choose a time and place, and select the contacts they would like to meet. When saved, the event automatically transforms into a group chat, and users can also RSVP and receive notification reminders.
I built this app during the COVID lockdown, and it is one of my side projects.
After having worked on the project already in 2019/2020, I re-joined the app team of Sparkasse's agency S-Markt & Mehrwert GmbH to support them on one of their projects, a white label customer loyalty app they're offering to their partners, one of which is Hamburger Sparkasse's app HaspaJoker.
The job mainly involved consulting, coaching, and weekly code reviews this time.
The app enables selected users to upload single or multiple photos combined with text to a public feed, which automatically deletes the content after two days. In addition, the app allows one user to stream live videos simultaneously, which then appear in the feed. Viewers of the stream can send emoji reactions which then move across the screen for all participants to see. Besides photos, selected users can also post products for sale in the feed, which are paid for via Apple Pay and can even be purchased by unregistered users.
A unique feature of the app is that all actions are visible to other users in real time. For example, if a user writes a text, other users can watch the author write it even before it is published.
12grapes GmbH is the company behind the app Bunch, an AI coach that makes it easy to learn and grow your
leadership skills with bite-sized daily tips.
I joined Bunch in August 2020 to help develop new features and reduce the technical depth to make the app
more performant, maintainable, and testable at the same time. To achieve this, I've built a backend with a
REST API and outsourced some of the app's business logic. Furthermore, I introduced Functional Reactive
Programming in an MVVM setup.
In December 2019 I joined the app team of Sparkasse's agency S-Markt & Mehrwert GmbH to support them on one of their projects, a white label customer loyalty app they're offering to their partners, one of which is Hamburger Sparkasse's app HaspaJoker.
Through the app, customers get special offers and discounts from local partners, book travel/concert tickets, and benefit from various perks and services. The agile scrum team consisted of 5 iOS and 4 Android, as well as 4 backend developers, and was working predominantly remotely. Some of my work included refactoring and consolidating the codebase to be testable, introducing Screenshot tests, automating tasks, and implementing new features.
Spielworks hired me to kick-start their product "Wombat" for iOS. For this greenfield project, I did both the architecture and the implementation of the beta version and later hired another developer who eventually took the project over.
The app is the first EOS wallet built for everyday use and simplifies the creation of EOS accounts through a three-step onboarding process. It automatically encrypts and stores the private key in the cloud, making sending/receiving EOS tokens a breeze. One of the app's core features is the DAPP Browser, which acts as a proxy between DAPP and the EOS account and provides a streamlined user interface to sign transactions.
Together with another developer, I’ve built the fitness video portal “My Fitness Video” for Fitness First. The project was set up with high scalability and security in mind and was built entirely with various Amazon Web Services (AWS) components. It consists of three main parts. Firstly the backend, where one of the more significant challenges was to implement the full payment and subscription process. Secondly, the web app, a server-side rendered vue.js single page application, and thirdly the content and customer management system for administrators.
Vantik is an investment-based retirement savings product (private pension). After having helped out Vantik as a freelancer end of 2017, I joined full-time in 2018 to build up the entire frontend stack and team. Since Vantik is a banking product, the highest priority in all layers of the stack was security and compliance with the German federal financial supervisory authority (BaFin).
Together with a team of developers put together by functionalaesthetics, I was working on the iOS swift app (universal - iPhone & iPad) for Boston Consulting Group’s client smile.direct, a Swiss insurance company. The app was designed to help families plan their everyday life. The central part of the app is an elaborate calendar, heavily optimized for easy user experience on both the iPad and iPhone. Furthermore, family members have profiles and can easily communicate through private messages.
Universal (iPhone & iPad) App
Create & edit events
Create & edit task lists
User registration & login
Reset & change password
Change app theme
Wine in Black
Wine in Black App
With another app developer I’ve built the native iOS swift (universal - iPhone & iPad) app for Wine in Black, a wine e-commerce company. Because Wine in Black is a curated shop with a limited, constantly changing assortment, the app stores all active products on the device and synchs with the server on startup so that all interactions with products, such as browse, searching, or filtering are instant and do not require a network connection.
Besides working on the iOS app, another part of the job was building a new REST API. This was necessary because the existing shop system was being replaced during the project.
For universeiscool, I built the social image-sharing app FOYER. It enables the user to combine text and photos into a story, and a layout algorithm takes care that stories look unique and sound on any device. An integrated image editor provides an easy way to get the most out of the pictures and social features such as sharing, likes, and comments to ensure that stories get the attention they deserve. The social feed channelizes the stories created or shared by followed users, and the discover section in the app exposes users' stories from outside the user’s network.