freiberufler Mobile iOS App Developer auf

Mobile iOS App Developer

  • 85‐100€/Stunde
  • 12053 Berlin
  • National
  • de  |  en
  • 08.07.2020


I have 10+ years of experience in developing and designing apps, web experiences, and backends. Currently, I’m primarily focusing on native iOS-apps (Swift).
Portfolio & contact:  -Hyperlink entfernt-

Ich biete

  • Back-End Entwicklung
  • Code Review
  • Front-End Entwicklung
  • Git
  • iOS
  • Jira
  • Swift (Apple)

Projekt‐ & Berufserfahrung

Senior iOS Developer
Sparkasse Markt & Mehrwert GmbH, Berlin
12/2019 – 5/2020 (6 Monate)

12/2019 – 5/2020


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, can book travel/concert tickets and benefit from a variety of other perks and services. The agile scrum team consisted of 5 iOS, 4 Android as well as 4 backend developers and was working predominantly remotely. Some of the work I did included refactoring and consolidating the codebase to be testable, introducing Screenshot tests, automating tasks, and implementing new features.

Technologies used
RxSwift, Fastlane, Alamofire, SwiftLint, SnapKit, MVVM, AppCenter, SwiftGen, Coordinator, Screenshot tests, Unit tests

Eingesetzte Qualifikationen

iOS, Git, Jira, Swift (Apple)

Senior iOS Developer
Spielworks GmbH, Berlin
7/2019 – 12/2019 (6 Monate)
IT & Entwicklung

7/2019 – 12/2019


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 and makes sending/receiving EOS tokens a breeze. One of the core features of the app is the DAPP Browser that acts as a proxy between DAPP and the EOS account and provides a streamlined user-interface to sign transactions.

Login, EOS account creation, Send/Receive EOS tokens, sign transactions, SDK for third-party apps, Manage EOS keys, Unlock private key, Prime subscription, EOS resources overview

Technologies used
In-App-Purchases, EOS Blockchain, AES Cryptography, Sign in with Apple, Facebook, Twitter and Email, Firebase, Crashlytics, RxSwift, MVVM, Google Drive, Dropbox, Unit tests

Eingesetzte Qualifikationen

iOS, Git, Jira, Swift (Apple)

App and Backend Developer
Fitness First Germany GmbH, Berlin
1/2019 – 6/2019 (6 Monate)
IT & Entwicklung

1/2019 – 6/2019


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 components of Amazon Web Services (AWS). It consists of three main parts. Firstly the backend, where one of the bigger challenges was, to implement the whole 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.

Heavily mobile-optimized web app, user login, user registration with multi-step onboarding flow, reset & change password, change email, video streaming, payment integration (Wirecard bank), subscription management, voucher codes, video recommendation based on user’s behavior, training programs, campaigns, analytics, cms for static pages

Technologies used
Web app:​ Nuxt.js, Bootstrap, Node.js, GraphQL, Webpack, Serverless, AWS Lambda, AWS Cognito, AWS S3, AWS CloudFront, AWS Clouformation
Web app (admin cms):​ Vue.js, Bootstrap, GraphQL, AWS S3, AWS Cloudformation, AWS CloudFront, AWS Cognito, Webpack Backend:​ Node.js, AWS Lambda, GraphQL API, AWS Cognito, AWS AppSync, AWS Kinesis, AWS RDS, AWS SES

Eingesetzte Qualifikationen

Node.js, Amazon Web Services (AWS), HTML5, JavaScript, Vue.js

Lead Frontend Developer (Festanstellung)
Vantik GmbH, Berlin
1/2018 – 1/2019 (1 Jahr, 1 Monat)

1/2018 – 1/2019


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. Vantik is an investment-based retirement savings product (private pension). 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).

Technologies used
Customer web app:​ Vue.js, Bootstrap, Node.js, Webpack, AWS Cognito, AWS Cloudformation, AWS S3, AWS Lambda
Admin web app:​ Vue.js, Bootstrap, AWS S3, AWS Cloudformation, AWS CloudFront, AWS Cognito, Webpack Visitor website:​ Node.js, Express.js, (Headless CMS), Pug
App (iOS):​ Swift, UIKit, Alamofire, RxSwift, MVVM, Reactive programming

Eingesetzte Qualifikationen

iOS, Node.js, Swift (Apple), Amazon Web Services (AWS), JavaScript, Vue.js

Senior iOS Developer
Boston Consulting Group, Munich
5/2017 – 1/2018 (9 Monate)
IT & Entwicklung

5/2017 – 1/2018


Together with a team of developers put together by functionalaesthetics GmbH, I was working on the iOS swift app (universal - iPhone & iPad) for Boston Consulting Group’s client, a Swiss insurance company. The app was designed to help families planning their everyday life. The main 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.

Features​ ​(excerpt)
Calendar component, create & edit events, comment, animated onboarding, create & edit task lists, import calendars, sharing, push notifications, user registration & login, reset & change password, family setup, private messages, change app theme

Technologies used
Swift, UIKit, Fastlane, RxSwift, MVVM, Reactive programming, Alamofire, AlamofireImage, SnapKit, SwiftLint, Firebase, BuddyBuild, Core Text, Core Telephony, Quartz Core, AVFoundation, Core Media, Core Video

Eingesetzte Qualifikationen

iOS, Git, Jira, Swift (Apple)

iOS-Developer (Festanstellung)
Wine in Black GmbH, Berlin
1/2016 – 5/2017 (1 Jahr, 5 Monate)

1/2016 – 5/2017


Together with another app developer I’ve built the native iOS swift (universal - iPhone & iPad) app for Wine in Black, a wine e-commerce company. Due to the fact that 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, search or filter 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.

Push notifications, campaigns, product detail page, cart, checkout, order history, profile, filters & search, custom transitions, store country switching, user registration & login

Technologies used
App​: Swift, UIKit, iAd, Core Image, Fabric, Fastlane, OneSignal, Crashlytics, Analytics
Backend​: PHP, Spryker Commerce OS, MySQL, Integration tests

Eingesetzte Qualifikationen

mySQL, iOS, Swift (Apple), Spryke

universeiscool UG, Berlin
5/2014 – 12/2015 (1 Jahr, 8 Monate)

5/2014 – 12/2015


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 good on any device. An integrated image editor provides an easy way to get the most out of the pictures and social features such as share, like and comment make sure 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 stories of users from outside the user’s network.

Login, registration, animated onboarding flow, story page, story editor, image editor and picker, social feed, like, share, comment story, discover section (stories & users), profile, push notifications, web app for cross-platform use

Technologies used
App​: Swift & Objective-C, UIKit, Core Image, Core Graphics, Core Animation, Alamofire, MVC, Unit tests
Web​: Angular.js, Image proxy
Backend​: Node.js, REST, Koa.js, AWS S3, AWS Lambda, AWS Simple Notification Service, AWS Simple Email Service, Neo4j Graph Database, Integration tests

Eingesetzte Qualifikationen

Node.js, Objective-C, Swift (Apple), Amazon Web Services (AWS), AngularJS


Angewandte Informatik
(Bachelor of Science)
Jahr: 2015
Ort: Hochschule für Technik und Wirtschaft, Berlin
Mediengestalter Digital Fachrichtung Gestaltung und Technik
Jahr: 2011
Ort: Düsseldorf


Preferred: Swift, iOS, Reactive Programming, RxSwift, MVVM, Fastlane, SwiftLint

Done in the past: Serverless, Vue.js, Nuxt.js, Bootstrap, Node.js, GraphQL, Webpack, AWS Lambda, AWS Cognito, AWS S3, AWS CloudFront, AWS Clouformation, AWS AppSync, AWS Kinesis, AWS RDS, AWS SES, AWS SNS

Über mich

I have 10+ years of experience in developing and designing apps, web experiences, and backends. Currently, I’m primarily focusing on native iOS-apps (Swift).
More info & contact: -Hyperlink entfernt-

Persönliche Daten

  • Deutsch (Muttersprache)
  • Englisch (Fließend)
  • Europäische Union
13 Jahre und 4 Monate (seit 01/2008)
2 Jahre


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