Goethe University Frankfurt

Software-Entwickler

IOS app for scanning contact information in the form of a QR code, as well as the dynamic display of customer data as a QR code.
- Form with field-related error messages
- List with filtering via input field,
- Dropdown to select the list type 
- Export of collected data in CSV format via share button
- Configuration in Preferences, 

IOS app for collecting power consumption figures. Display of values as summary, in table form and as bar graph.
- Data import and export in CSV format via clipboard.
- Configuration in Preferences
- Bottom tab bar, segmented control,
- Settings in iOS style

IOS app to control both motors of a device via Bluetooth LE.

IOS app to select personal value sorting via "drag & drop" with graphical display of the result as radar chart.

IOS app for training shortcuts. 

Various web apps for simulating physical motion patterns, Newton's Cradle,

Self-Employed

Development of various iOS apps with Flutter 

Further development of a banking app in an agile team.

Implementation of new functionalities while following the architecture specifications of a large ( > 100kloc) project.

Cofinpro

Flutter Senior Software Developer

The development of new features took place in 2-week scrum sprints, managed with Jira, source control and code reviews with GitLab, documentation with Confluence. 

My main focus was:
- Connecting to backend web services with Codable and domain wrapper classes.
- Testability of all error cases of the web service responses
- Creation of stub responses to enable backend independent development
- Automated UI tests locally and in the Jenkins CI 
- Continuous Integration with Jenkins

The project placed special emphasis on accessibility. All screens had to support Dynamic Type and VoiceOver.

DB Systel GmbH

iOS App Developer

My duties included:
- Own responsible implementation of a new external interface (360Dialog CMS) with display of fetched JSON data in PageViewController.
- Caching of status information in CoreData.
- Implementation of Apple Push Notifications via 360Dialog backend.
- Maintenance with debugging and bug fixing according to Jira bug tickets in very large code base ( ca. 60000 lines of Swift code).
- Implementation of various features according to Jira stories.

Deutsche Telekom

Project Details:
- iOS development with very complex TableViews Large codebase ( > 50000 lines of Swift code)
- High requirements for visual design and data security
- modularized app with frameworks in separate Xcode projects
- Complex architecture with registered DataManagers, cross-module use of ViewControllers, MVVM and MVC, ...
- Highlevel Swift > 2.0 ( optionals, generics, enums with associated types, try/catch, protocols, closures, functional programming, ...)

My duties included:
- Swift training and guidance of junior developers
- Clarification of details with medium developers
- Discussion of architecture issues with other seniors
- Clarification of functional details with product owner( or analyst)
- Design and parsing of backend JSON responses
- Testing of JSON Responses with Postman and Paw
- Creation of unittests and automated UI tests in Xcode
- Building different app variants with xcodebuild
- Set up of Continuous Integration with Teamcity and Artifactory

Development environment:
- Git hosted in BitBucket with Commandline, Sourcetree and in Xcode
- Workflow with Jira and agile plugin
- Scrum in a multi-scrum team environment
- English in the team with Indian and Eastern European colleagues

Alfred Schilken