Felix Heller

App Engineer

Felix Heller
Darmstadt, Germany

Experience

Oct 2024 - Present
1 year 4 months

App Engineer

Merck KGaA

  • Further development of various apps in the context of a Digital Trust Framework / IIoT
  • Programming language: Dart
  • Technologies & frameworks: Flutter, Stacked, CI/CD
Mar 2024 - Jul 2024
5 months

Android App Engineer

ALRE-IT Regeltechnik GmbH

  • Development of an app to control thermostats
  • Programming language: Dart
  • Technologies & frameworks: Flutter, Riverpod, NFC communication
Feb 2024 - Dec 2024
11 months

Frontend Engineer

Active Artware GmbH

  • Further development of intranet websites for a large chemical company
  • Programming languages: TypeScript, C#, HTML, LESS
  • Technologies & frameworks: Angular, ASP.NET, REST APIs
Oct 2023 - Dec 2023
3 months

Android App Engineer

Self-employed

  • Developed a new open source app to help reduce smartphone use
  • Fully open source with over 180 "stars" on GitHub
  • Programming language: 100% Kotlin
  • Technologies & frameworks: Jetpack Compose, MVVM, Hilt Dependency Injection, Material 3, DataStore
Aug 2023 - Sep 2023
2 months

Android App Engineer

NC Computer

  • Developed a new Android app to optimize warehouse logistics processes for a fire door manufacturer
  • App for batch uploading photos over a network, linking them to an order through QR code scanning
  • Programming language: 100% Kotlin
  • Technologies & frameworks: Jetpack Compose, Kotlin Coroutines, Material 3, DataStore, JCIFS
Jan 2023 - Jun 2023
6 months

Mobile App Engineer

velocate / PSP Pauli Services & Products GmbH

  • Further development of an app for GPS trackers and caravan sensor monitoring systems
  • App for monitoring and locating caravans, controlling and reading various sensors (e.g., tire pressure, gas level)
  • Rebuilding the same app in Flutter
  • Programming languages: Dart; JavaScript, SCSS
  • Technologies & methods: Flutter, Riverpod, GoRouter, Hive, Freezed; NativeScript, VueJS, OneSignal/Firebase; Git, agile development, Jira
Jul 2022 - Aug 2022
2 months

Cloud Software Engineer

Save The Children

  • Support in developing Salesforce and Talend applications
  • Integrating Java software with the Talend Cloud
  • Programming languages: Java, JS
  • Technologies & methods: Salesforce Marketing Cloud
Jan 2022 - Dec 2022
1 year

Frontend Engineer

Immomio GmbH

  • Development of a new app for housing company tenants to retrieve documents and messages, update their personal data, and report damages in their apartment
  • Programming the UI based on Figma templates and connecting the screens to the backend
  • Programming the module for reporting damages using a dynamic, path-dependent, and backend-configurable questionnaire
  • Generalization of UI components for whitelabeling the app
  • Programming languages: TypeScript, SCSS
  • Technologies & methods: NativeScript, Angular 12, GraphQL, NGRX, Git, CI/CD, Test Automation; Scrum, Scaled Agile (SAFe), Jira, Figma
Aug 2021 - Dec 2021
5 months

Frontend Engineer

DIT Deutsche Immobilien IT & Marketing GmbH

  • Maintenance of a legacy app for housing company tenants (similar to Immomio)
  • Programming languages: JS, HTML5, CSS
  • Technologies & methods: Apache Cordova, Git
Jan 2021 - Dec 2022
2 years

Webmaster

Meeting Of Styles Wiesbaden

  • Redesign and further development of the website
  • Programming the theme and online shop
  • Connecting the website to existing databases for automated content generation
  • Programming languages: PHP, JS, HTML5, CSS
  • Technologies & methods: WordPress, WooCommerce, Integromat, Airtable
Jan 2021 - Feb 2021
2 months

Research Assistant

Johannes Gutenberg-Universität Mainz

  • Developed a module for conducting online studies
  • Programming languages: JS, HTML5, CSS
Oct 2015 - Mar 2016
6 months

Android Developer & Frontend Engineer

CoSee GmbH

  • Further development of an Android app and new development of a web portal for online lending of eBooks and Audiobooks
  • Development of the e-reader component and the audio player
  • Integration of test frameworks using Jenkins
  • Programming languages: Kotlin, Java, JS, HTML5, CSS
  • Technologies & methods: ExoPlayer, ReactJS, Butterknife, Retrofit, OrmLite, Git Flow, Scrum, Retrospectives, Weekly meetings, JIRA, Jenkins
Mar 2014 - Present
11 years 11 months

Android App Developer

Self-employed

  • AlcoTrack: Android app to track alcohol consumption with over 200,000 downloads and translated into 17 languages, average rating 4.6 stars
  • DetoxDroid: open-source Android app to reduce smartphone usage with over 180 stars on GitHub
  • CheatDroid: Android app for 'hacking' app settings with over 2 million downloads
  • Developed a web tool for collaborative translation of Android apps with an API link to the Google Play Store for automatic transfer of translations to the store
  • Programming languages: Dart, Kotlin, Java, Python, HTML5, CSS, PHP, JS
  • Technologies & methods: Flutter, MVVM, Jetpack Compose, Git, code generation, unit tests, Guava, GSON, Fat-Free PHP, WordPress, jQuery, Bootstrap, BLoC

Skills

  • Programming Languages: Kotlin, Java, Python, Dart, Php, Html5, Js, (S)css, Sql

  • Methods: Scrum, Scaled Agile (Safe), Kanban, Clean Code, Ci/cd, Solid, Design Patterns, Architectural Documentation

  • Frameworks / Technologies: Flutter, Angular 12, Vue, Jetpack Compose, Nativescript, Bluetooth Low Energy (Ble), Firebase, Figma, Riverpod, Jenkins, Appium, Ci/cd, Libgdx, Laravel, Fat-free Php, Bootstrap, Jquery, Node.js, Express.js, Mongodb, Wordpress, Apache Cordova, Swagger/openapi

  • Software: Android Studio / Intellij Idea, Git, Gimp, Ableton Live

  • Industry Knowledge: Web Development, Data Science, It Security, Google Material Design, Web Crawling, Real Estate Industry

Languages

German
Native
English
Advanced
French
Intermediate
Spanish
Elementary

Education

Apr 2016 - Sep 2019

TU Darmstadt

M. Sc. · Business Informatics · Darmstadt, Germany · 1,35

Oct 2012 - Oct 2015

TU Darmstadt

B. Sc. · Business Informatics · Darmstadt, Germany · 2,10

Apr 2012 - Oct 2012

Johannes Gutenberg-Universität Mainz

Computer Science · Mainz, Germany

...and 1 more

Certifications & licenses

Android LinkedIn skill test

LinkedIn

Angular LinkedIn skill test

LinkedIn

Java LinkedIn skill test

LinkedIn

Kotlin LinkedIn skill test

LinkedIn

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