Twofingers Apps

Apps with passion

15 years app experience

I have been developing apps as full-stack developer for Android and iOS since 2010. Meanwhile I am looking at over 1 million app downloads and thousands of satisfied user reviews.

App Highlights

Technologically Up-to-date

My personal ambition drives me to always be up-to-date on the latest app technologies. The constant development of my own apps allows me to immediately back up new technologies and standards with practical experience.

My profile

Your idea-realizer

With many years of broad expertise and great passion for apps in general I will support you from feasibility analysis over conception to development and release management of your apps.

Contact me now

Highlights

Trader Radar

Notifies about the publication of insider trades in the USA and Germany in near real-time. The knowledge of insiders in your pocket.

Trader Radar Homepage

What's it worth on eBay?

Kotlin Multiplattform app for Android and iOS with minimal plattform-specific code. Finds the current market value of items in seconds. Features a barcode-scanner and statistics for optimizing sales. Perfect for private and professional sellers.

to App Store

Crystal Math

A different kind of brain teaser. Mental arithmetic against the clock - along with duels against friends and daily high score list.

to App Store

Profile

Rafael Kolloch

Senior Software-Engineer

With over 25 years of programming experience from web over backend to mobile apps, I look back at a rich set of skills in various disciplines. Being a team-player and open communicator I am passionately looking forward to engage in your project and help you lead it to success.

Full profile at FreelancerMap

Fields of expertise

Analysis, consulting, architecture, development, app store management

Sectors

Automotive, banks, logistics, lottery, public services, retail, utilities, insurance

Programming languages

Kotlin, Java, Objective-C, Swift, PHP

IDEs

Android Studio, IntelliJ IDEA, Xcode, Eclipse, Netbeans, Visual Studio Code

Android skills

Android SDK, Kotlin Multiplattform, AndroidX, Android Jetpack, Koin, Dagger2, Coroutines, MVVM, MVP, MVI, Room, LiveData, SQLite, SQLCipher, Retrofit, OkHttp, Gson, Firebase (Ads, Cloud Messaging, Crashlytics, Realtime Database, Remote Config), Admob, Glide, Picasso, Timber, Material Design UI, Google Human Interface Guidelines, Biometrische Authentifizierung (Fingerprint), Gradle, Unit Tests, JUnit, Mockito, MockK, Robolectric, Release Management

iOS skills

CocoaPods, Firebase (Ads, Crashlytics, Cloud Messaging), Release Management

General skills

Regular Expressions, Reverse-Engineering, Pentesting, Web-Scraping

Project-management / CI

SCRUM, Atlassian Toolchain, JIRA administration / customization, Bitbucket, Jenkins, TeamCity, SonarQube

Cooperations

avanCode GmbH

Especially when it comes to developing for the various Apple platforms, I value the expertise of the colleagues at avanCode. As a well-coordinated team of experts we will bring your Multi-Platform projects on track in record time.

avanCode Homepage

growth project UG

With growth project UG in Hamburg, I develop innovative learning and training platforms. Together, we work on bringing e-learning concepts to all areas of education and training.

growth project Homepage