Senior iOS Developer

Role: Lead iOS Developer

Description:
Led the development of the "VelObserver" app that enables users to rate sections of bicycle
paths during their rides. This feedback provides a comprehensive overview of path conditions, empowering
cities and municipalities to make targeted improvements.

Quantifiable Achievements:

• Implemented the map with the route to be traveled.
• Developed the system for evaluating individual sections.
• Implemented the evaluation overview in a chart (Swift Charts).

Technologies Used: Swift, SwiftUI, CoreLocation, MapKit, REST, JSON

Role: Lead iOS Developer

Description:
Developed the "Posmo" app on iOS, which tracks users' transportation modes and patterns. This
data is used by cities and municipalities for analysis, aiding in the enhancement of public transport systems to
be more economically efficient and environmentally friendly.

Quantifiable Achievements:

• Reduced error rate by 30% through comprehensive unit tests.
• Decreased development time by 15% through the use of modern frameworks and tools.
• Implemented a custom date picker with SwiftUI.

Technologies Used: Swift, SwiftUI, CoreLocation, Background Processing, MapKit, REST, JSON

Role: Lead iOS Developer

Description:
Developed the "CityServer" app for iOS, enabling cities and municipalities to efficiently capture
and analyze images and data of bicycle paths. Utilized GPS and image processing technologies, significantly
enhancing the management and maintenance strategies of infrastructure.

Quantifiable Achievements:

• Implemented the capture of images every 10 meters, including upload.
• Developed the map with the locations of the captured images and the route to be traveled.
• Developed a clear display of images with custom SwiftUI views before upload.

Used Technologies: iOS, Swift, SwiftUI, AVKit, Combine, MVVM-C, MapKit

Role: iOS Developer

Description:
Engineered an innovative SDK compliant with ISO/IEC 18013-5:2021 standards, enabling the
secure storage, delivery, querying, and verification of digital driver licenses. Utilized Bluetooth LE and NFC
technology to facilitate seamless and secure communications between devices.

Quantifiable Achievements:
• Introduced Combine to simplify internal processes.
• Developed NFC and Bluetooth functionalities for device-to-device communication.

Technologies Used: iOS, Swift, Combine, Bluetooth LE, NFC, Wifi Aware, OpenID Connect, CryptoKit, CBOR,
CDDL, COSE, X.509

Role: iOS Developer

Description:
Developed "BitGo 2.0", a mobile integration platform for BITMARCK, leading to its adoption by
over 15 German health insurance companies. This white-label app enhances the accessibility of healthcare
services for numerous insured members.

Quantifiable Achievements:
• Developed a modular system to implement individual features and add-ons for various health insurance
companies.
• Onboarded new developers to the project.
• Implemented dynamic forms for applications based on XML.

Technologies Used: iOS, Swift, SwiftUI, Combine, JSON, XML, Kobil, apsec, MVVM-C

Role: Software Engineer, Bug fixing

Description:
With around 120,000 apartments, our customer is one of the largest housing providers in North Rhine-Westphalia and ensures that nearly 300,000 people between Aachen and Ahlen find a home.
Our customer sees high customer satisfaction as its driving force for success. To ensure this high customer satisfaction, our customer is available to its customers as a competent contact and advisor for all questions, both on-site and in the form of an online customer portal.
The responsive customer portal provides the tenant with the opportunity to take advantage of various tenant services online, in order to be able to handle different rental matters with a few clicks at any time. The existing online rental services include:
• managing customer data,
• an overview of existing contracts,
• the ability to report damages,
• an overview of the account and additional costs,
• a mailbox for communication with our customer,
• various templates and certifications,
• a property search,
• various tips and tricks,
• an area with benefits for tenants and
• the tenant magazine "Bei uns".
In addition to the responsive customer portal, an app implemented for iOS and Android was developed. The concept, design and development was realized by adesso mobile.

Used Technologies: Xamarin, C#

Role: iOS Developer

Description:
Actively participated in the development of the Mobile Retter-App, an innovative emergency
response application that notifies nearby doctors of emergencies, facilitating faster medical intervention than
traditional ambulance services.

Quantifiable Achievements:
• Fixed bugs and implemented unit tests.

Technologies Used: Swift, UIKit, Push Notifications, GPS, REST, VIPER

Role: Software Engineer, Development of the Xamarin app

Description:
As part of the development and implementation of its digitalization strategy, our client wants to offer customers and interested parties a central point of entry into its comprehensive and constantly growing range of services. At the same time, the mobile communication channel 'smartphone' should be further expanded and used to meet future requirements for data protection and data security (topic: two-factor authentication). In addition to the implementation of the mobile solution, this project also focuses on the introduction of modern infrastructure components (cloud technologies, IaaS/ PaaS/SaaS, ...) and the introduction of new development processes (SCRUM). In addition to the implementation of the apps and some backend components, adesso also supports with consulting.

Resource Description:
• 2-3 Xamarin Developers
• 1 Concept Developer
• 1 Designer
• 1 Build Server Coordinator
• 1-2 Backend Developers
• Scrum Team including Product Owner and Scrum Master

Project Description:
Development of the official app for our client. Our client wants to offer customers and interested parties a central point of entry into its comprehensive and constantly growing range of services through the new app as part of the development and implementation of its digitalization strategy. The app offers a variety of news and services, supports quick and direct contact and enables policyholders to use other digital services such as applying for an electronic health card (including picture upload). The modern security architecture of the app will be able to meet the requirements of two-factor authentication across multiple digital services of our client in the future.

Used Technologies: Xamarin, C#, .NET, Sqlite, Kobil, MVVM, Xamarin Android , Xamarin iOS, Git, Swagger, AppCenter

Role: iOS Developer

Description:
Developed an internal company app for managing vacations and absences, which streamlined
the process of recording employee time off, improving operational efficiency and reducing administrative
workload.

Quantifiable Achievements:
• Implemented push notifications.
• Developed the absence calendar with UIKit.

Technologies Used: Swift, UIKit, Push Notifications, MVVM

Role: Software Engineer, Development of the Android app

Description:
An Android app in which users can calculate measuring spots and optics of special hardware that our customer sells.

Used Technologies: Android, JSON

Role: iOS Developer

Description:
Development of the "passauf!" app for iOS, enabling real-time alerts on nearby hazards through
a public map interface, which significantly enhanced user awareness and safety. Implemented geolocation-
based push notifications to alert users immediately when approaching notified areas.

Quantifiable Achievements:
• Developed the Firebase backend.
• Implemented push notifications when approaching a danger area.

Technologies Used: iOS, Swift, UIKit, CoreLocation, MapKit, Firebase, Push Notifications, MVVM

Role: Software Engineer, Android development

Description:
A battery-warner that sends an alert to the user when the phone is charged or discharged to X%.

Used Technologies: Android, Java, SQLite

Role: Software Engineer, Development of the iOS app

Description:
It is an app for recording and sending voice messages (e.g. via email).

Used Technologies: iOS, UIKit, Swift, AVKit