Steven M. - Senior Android Developer

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Dallgow-Döberitz, Germany

Experience

Dec 2024 - Dec 2024

1 month

Freelance Trainer

TÜV Rheinland Akademie

Hands-on seminar "Generative AI in Software Development" (3 sessions)
Mobile apps and cloud computing
Internet of Things, smart home and consumer healthcare
Future of mobile communication

Sep 2024 - Present

1 year 1 month

3D/Augmented Reality Platform for eCommerce

Smart As Apps GmbH / glimpsey.io

Planning, development and operation of the 3D/AR solution Glimpsey.io
Managing an offshore developer team to implement the back-office part
Managing various other service providers
AI-supported customer acquisition
Creating case studies

Oct 2022 - Dec 2024

2 years 3 months

Senior Android Developer

DAK-Gesundheit

Further development of the existing DAK app
Native apps with Kotlin
MVVM with Databinding and Jetpack Compose
Encryption of sensitive data and generation of cryptographic keys
Accessibility according to BITV
CI/CD using Azure DevOps
Improving the app architecture through deep refactorings (e.g. navigation)
Participating in internal OWASP Top 10 trainings
Evaluating three providers for video consultations through a proof-of-concept as part of an EU-wide tender (3x3 weeks)
Assisting with the bootstrapping for integrating an electronic patient record (ePA) solution into the DAK app (until setting up our own dev team)
Developing new features: native bonus program, native bank account management, personalized pregnancy companion
Evaluating various SAST solutions in two three-week proof-of-concept phases

Oct 2022 - Nov 2022

2 months

Android and iOS AR App Updates (contract)

Audi AG

Coordinating with the lead agency for the Audi Twin Cup
Updating the AR toolkits and 3D models used
Android: migrating from Google Sceneform to SceneView
Coordinating the 3D agency in creating the required models
Releasing and maintaining the apps on Google Play Store and Apple App Store

Jun 2022 - Sep 2022

4 months

Android App Modernization (contract)

Commit GmbH

Modernizing the existing VagusVit app
MVVM with Databinding as architecture pattern
Dependency injection with Koin
Reactive programming with Kotlin coroutines and flows
Database integration with Room
New versions of the Android Architecture Components / Jetpack
Updated custom animations

Jan 2022 - Sep 2022

9 months

Senior Android Developer (Augmented Reality)

Otto GmbH & Co KG

Consulting in augmented reality
Development of an AR feature with the SceneView library
Provision of the feature as an internal SDK for other teams

Sep 2021 - Dec 2021

4 months

Parental leave

May 2021 - May 2021

1 month

Android and iOS AR Apps Update (Contract)

Audi AG

Coordination with the lead agency of the Audi Twin Cups
Update of the AR toolkits and 3D models used
Coordination with the 3D agency on creating the required models
Publication and maintenance of the apps on the Google Play Store and Apple App Store

Mar 2021 - Aug 2021

6 months

Senior Android Developer

DAK-Gesundheit

Implementation of a showcase Android app including integration into the existing DAK app
Native apps with Kotlin
MVVM with data binding and Android Architecture Components / Jetpack
Encryption of sensitive data and generation of cryptographic keys
Implementation of OpenID Connect authentication using the AppAuth library
Accessibility according to BITV
Unit tests with JUnit and Mockito
UI tests with Espresso
CI/CD with Azure DevOps

Jan 2021 - Oct 2021

10 months

Smart Home App Development (Contract)

Holtec Electronics

Development of a cross-platform app with Flutter for Android and iOS
Connection of blinds via Bluetooth Low Energy (BLE)
Firmware updates over BLE and DFU
Configuration, distribution, and crash reporting via Firebase

Jul 2020 - Feb 2021

8 months

Senior Android Developer

Swissprime Technologies AG

Further development and migration of the existing Android app
Native app with Kotlin
MVVM with data binding and Android Architecture Components / Jetpack
Encryption of sensitive data and generation of cryptographic keys
Integration of smart locks via BLE
Handling push events via Firebase Cloud Messaging
Unit tests with JUnit and Mockito
Requirements documentation and CI/CD with Azure DevOps

Apr 2020 - Jun 2020

3 months

AR app update (contract)

Audi AG

Coordination with the lead agency of the Audi Twin Cups
Updating the AR toolkits and 3D models
Coordinating the 3D agency in creating the required models
Publishing and maintaining the apps on the Google Play Store and Apple App Store

Oct 2019 - Feb 2021

1 year 5 months

Android app development (contract)

Life Science Inkubator

Requirements analysis
Recruiting and managing the UI/UX design
Development and documentation of the Android app
Native app with Kotlin
MVVM with data binding and Android Architecture Components / Jetpack
Encryption of sensitive health data
Connecting a sensor via BLE
Using a machine learning model with TensorFlow Lite
Handling push events via Firebase Cloud Messaging
Unit tests with JUnit and Mockito
UI tests with Espresso

Apr 2019 - May 2019

2 months

AR app development and support (contract)

Audi AG

Concept and creation of the AR app for Android and iOS
Android: Kotlin, ARCore, Sceneform
iOS: Swift, ARKit, SceneKit
Coordinating the 3D agency in creating the required models
Publishing and maintaining the apps on the Google Play Store and Apple App Store

Mar 2019 - Oct 2019

8 months

Senior Android Developer

Daimler Fleetboard GmbH

Development of a modern Android app with Kotlin
MVVM with data binding and Android Architecture Components / Jetpack
LiveData, ViewModel, Navigation Component
Location-based services with Google Play Services
Text extraction from live camera images
Unit tests with JUnit and Mockito
UI tests with Espresso
Adapting the app for Android Auto on Daimler trucks
Preparing and hardening the app for external pentesting (OWASP Top 10)
Development in Scrum, CI/CD with Azure DevOps

Nov 2018 - Feb 2019

4 months

Senior Android Developer

Lab 1886 GmbH

Worked on an e-scooter sharing app for Lab 1886
Native app built with Kotlin
MVVM with Android Architecture Components / Jetpack
LiveData, ViewModel, Navigation Component, Data Binding
Integration with the Stripe payment provider
Google Maps SDK
Unit tests using JUnit and Mockito
UI tests with Espresso
Development following Clean Code principles
CD/CI using GitLab and a Gitflow branching model

Jun 2018 - Dec 2018

7 months

Senior Android Developer

Sensor Digital Media GmbH

Took over and expanded an existing Android app (phone and tablet)
Updated design and features to match the iOS app
Gradually converted the Java codebase to Kotlin
Technical support and implementation of the white-label approach
Used Android Architecture Components / Jetpack

Dec 2017 - Jan 2019

1 year 2 months

Senior Android Developer (Augmented Reality)

Otto GmbH & Co KG

Developed the "yourhome Augmented Reality" app
Native app with Kotlin, ARCore, and Sceneform
Close collaboration with the Google ARCore development team (Early Access Program)
One of four showcases at the Google ARCore booth at Mobile World Congress 2018

Jan 2017 - Nov 2017

11 months

Senior Android developer

mCrumbs GmbH

Refactored and enhanced existing Android apps
Created new apps for new projects
Built an internal SDK to simplify maintenance and new development
Converted parts of the Java codebase to Kotlin
Switched the dependency injection framework from Dagger to Koin

Oct 2016 - Jun 2017

9 months

Android Bluetooth Classic and LE Coach

ChronicWatch

Coached a developer in India on medical device connectivity using Bluetooth LE and Classic, Android development, and software architecture
Coaching through Bitbucket code reviews, emails, and video conferences

Sep 2016 - Dec 2017

1 year 4 months

Senior Android Developer

Otto GmbH & Co KG

Collaboration on projects for the Otto Mobile Labs in a Scrum setting
Further development of a modular app framework (Java/Kotlin) for shopping apps
Used this framework in apps like myToys, Sheego, Heine, Lascana, SportScheck
Focus on software architecture and modularization (MVP, Clean Code)
Independent, interchangeable modules
High testability with JUnit, Mockito, Espresso
Use of backend documentation with Swagger

Aug 2016 - Sep 2016

2 months

Android App Porting (Contract)

Commit GmbH

Porting of the iOS app "VagusVit" to Android
Native Android app with Kotlin
MVP as an architecture pattern
Dependency injection with Dagger
Reactive programming with RxJava and RxKotlin
Database integration with SqlBrite as ORM
Use of Android Architecture Components
Notifications and custom animations
Infrastructure: GitLab and Jenkins

Nov 2015 - Jul 2016

9 months

Senior Android Developer

Iconmobile GmbH / Freeletics GmbH

Development of the Freeletics Gym app up to version 1.2
Pixel-perfect implementation of iOS screen designs
Implementation of in-app purchases (subscriptions)
Facebook login and registration
Video download and playback
Integration of Google Analytics
Creation of custom views (graphs)
Use of state-of-the-art libraries: Dagger2, RxJava, Retrofit2
Git and Gitflow
Agile software development process using Scrum

Mar 2015 - Nov 2015

9 months

Senior Mobile Developer

BodyTel GmbH

Contribution to a diabetes diary app for iOS in Swift
Redesign of the BodyTel Android app
Connection of blood pressure monitors, scale, and blood glucose meter via BLE
Development of a proof of concept for Continua-compliant data transfer
Introduction of Crashlytics and Beta for Android and iOS
Use of backend documentation with Swagger
Agile software process (Scrum), JIRA, and Confluence

Nov 2014 - Feb 2015

4 months

Senior Android Developer

Fortunella UG (haftungsbeschränkt)

Assignment at BodyTel GmbH
Development of mobile projects
Design of automated acceptance tests for medical software (CI with Jenkins)

Jun 2014 - Nov 2014

6 months

Senior Android Developer

Affinitas GmbH

Assist with the further development of the ShopAMan app
Improve internal development and testing processes
Document requirements in JIRA and Confluence
Agile software process using Scrum

Feb 2014 - Present

11 years 8 months

Managing Director

Smart As Apps GmbH

Mobile development services
Seminars and workshops in the mobile field for non-technical participants

Jul 2013 - May 2014

11 months

External Android Developer

BodyTel Europe GmbH

Assist with the further development of the Android app
Integrate new medical devices via Bluetooth
Dependency injection with Dagger
Improve internal development and testing processes
Agile software process (Scrum), JIRA and Confluence

Apr 2013 - Jul 2013

4 months

Freelance IT Consultant

ZappChoice GmbH

Manage the external mobile development team
Set up an internal testing process
Requirements analysis and definition in JIRA

Dec 2011 - Jan 2014

2 years 2 months

Freelance Mobile & Web Developer

Steven Mohr Mobile & Web-Entwicklung

Develop Android apps
Implement web projects based on Python/Django
Consult on the design and implementation of Android apps
Design and set up internal testing and development processes

Apr 2011 - Jun 2012

1 year 3 months

Technical Project Manager

German Aerospace Center (DLR)

Technical leadership of the Plug&Care Connector project (Android-based app for connecting medical devices) within the EU project EmotionAAL
Technologies: Android SDK, XML layouts, Bluetooth Classic, background work
CI/CD with Hudson/Jenkins, bug tracking with Mantis
Concept development and further development
Communication with clients and project partners
Supervision of student assistants

Apr 2011 - Jun 2011

3 months

System Developer

Center for Mental Health (ZI)

Design and implementation of a prototype ticket management application based on Microsoft SharePoint 2010

Oct 2010 - Mar 2011

6 months

Civilian Service Volunteer

Center for Mental Health (ZI)

Sep 2007 - Sep 2010

3 years 1 month

Dual Study Program

German Aerospace Center (DLR)

Practical phases in the Simulation and Software Engineering department in Cologne
UI testing
Testing an Apache module using Python unit tests
Enhancement and participation in the architecture refactoring of DataFinder