Vojtech Vrbka, Software Developer in London, United Kingdom
Vojtech Vrbka

Software Developer in London, United Kingdom

Member since May 1, 2019
Vojtech is a London-based senior Swift contract developer with a master's degree in computer science and nine years of experience in developing successful iOS apps for both start-ups and established organizations. He works well in small and big teams (30+ iOS developers) supporting apps with millions of users.
Vojtech is now available for hire

Portfolio

  • Babylon Health
    Coded UI Tests, Unit, Redux, ReactiveSwift, Swift
  • JustEat
    Optimizely, Firebase, Continuous Integration (CI), Coded UI Tests, Unit, Swift
  • Karhoo
    Development, Test-driven Development (TDD), Continuous Integration (CI), C...

Experience

  • Development 11 years
  • Swift 5 years
  • Objective-C 4 years
  • Functional Reactive Programming 2 years

Location

London, United Kingdom

Availability

Part-time

Preferred Environment

Xcode

The most amazing...

...app I've developed was Velocity, which I scaled from 0 to 50,000 users in three months.

Employment

  • Senior Swift Developer (Contract)

    2019 - PRESENT
    Babylon Health
    • Implemented Auth0 authentication.
    • Supported the team with regular app releases.
    Technologies: Coded UI Tests, Unit, Redux, ReactiveSwift, Swift
  • Senior Swift Developer (Contract)

    2019 - 2019
    JustEat
    • Developed new features for millions of JustEat users.
    • Supported team with bi-weekly app releases.
    • Maintained apps by finding and fixing crashes and other issues.
    Technologies: Optimizely, Firebase, Continuous Integration (CI), Coded UI Tests, Unit, Swift
  • Senior Swift Developer (Contract)

    2018 - 2019
    Karhoo
    • Developed Karhoo SDK, which is used for easy access to Karhoo API. It handles authentication, taxi quotes, booking, driver tracking, and journey updates.
    • Developed Karhoo UI SDK that extends Karhoo SDK with UI. The app is bundled as a framework and allows easy integration with partner apps.
    • Developed Karhoo App as a sample app that uses both SDKs.
    • Maintained high test coverage with Unit and Integration tests for all project mentioned.
    Technologies: Development, Test-driven Development (TDD), Continuous Integration (CI), C, Viper, Swift
  • Senior Swift Developer (Contract)

    2018 - 2018
    Ostmodern
    • Optimized the Olympic Channel app for iPhone X and shipped a couple of updates.
    • Joined Formula 1 app team and help them finish and polish the new app.
    Technologies: UI, Video on Demand (VOD), Functional Reactive Programming, Swift
  • Senior Swift Developer

    2017 - 2018
    Fitzdares
    • Led and took ownership of Greenfield, a Swift project.
    • Chose to use MVVM architecture with reactive and functional programming to create readable, easily expandable, and highly testable code.
    • Ensured that the classes are decoupled as much as possible.
    • Used TDD approach to develop new features and achieved total project test coverage to around 80%.
    • Used state machine for navigation between different screens of the app.
    • Implemented a continuous integration using Bitrise CI. It automatically runs tests on pull requests and sends results to Github pull request page. Only PRs passing the tests (tests, swift lint, code coverage) can be merged in.
    • Pushed to master/develop branches to create a build and send it to iTunes.
    Technologies: API Design, Continuous Integration (CI), Test-driven Development (TDD), Model View Viewmodel (MVVM), Swift
  • iOS Swift Developer

    2015 - 2017
    Firefly Experience Limited
    • Developed a highly customized user interface with customized animations and use of Core Graphics.
    • Used customized maps (Mapbox) to present the user’s captured trails and points of interest.
    • Supported the designing of the app’s architecture, which was MVVM with reactive programming.
    • Implemented CI using onsite Mac Mini server.
    • Used Xcode Bots and Fastlane to make nightly builds, run tests and automatically create release builds.
    • Managed a great volume of user testing using Mixpanel and UXCam.
    Technologies: Core Data, Core Location, Animation, Test-driven Development (TDD), Model View Viewmodel (MVVM), Swift
  • Lead iOS Developer

    2014 - 2015
    Velocity
    • Took ownership of the app when Uncover was in beta version with the final version featured multiple times by Apple as Best New App and Best Food App.
    • Implemented new features and highly custom animations.
    • Managed to successfully put down crashes to 0.02% of sessions.
    • Implemented Socket.IO to support live server updates inside the app.
    Technologies: Socket.IO, Swift
  • iOS Developer (contract)

    2012 - 2014
    Zentity
    • Developed varied projects within banking and eCommerce.
    Technologies: UI, Core Data, Model View Controller (MVC), Objective-C
  • PHP Developer

    2008 - 2010
    Shopsys
    • Developed new features and maintained the eCommerce software.
    Technologies: MySQL, PHP

Experience

  • JustEat (Development)

    JustEat is a food delivery app supporting 40 million customers across 13 countries with revenue of $5.3 billion in 2018.

  • Babylon Health (Development)

    Babylon believes it is possible to put an accessible and affordable health service in the hands of every person on earth.

  • Olympic Channel (Development)

    App with live sports channels and video-on-demand streaming.

  • Formula 1 (Development)
    https://apps.apple.com/gb/app/formula-1/id835022598

    A new version of the official Formula 1 app.

  • Travel Spective (Development)
    https://appletv.travelspective.com

    Apple TV app with travel videos on demand.

  • Karhoo (Development)
    http://karhoo.com

    Karhoo is a taxi booking platform integrated with Taxi Fleets worldwide.

    I worked on SDK that Karhoo partners can integrate into their apps and sample app that shows SDK integration.

  • Xendpay Money Transfer (Development)

    Transfer money to over 170 countries in 50 currencies, including euros, US dollars, and British pounds. With our easy-to-use app, you can send money overseas from your iPhone or iPad anytime, anywhere.

  • Alza (Development)

    The end of the desperate searches on the Internet. You can get almost anything on Alza. Everything conveniently in one place, right in your pocket.

Skills

  • Languages

    Swift, Objective-C, PHP, C, SQL, JavaScript
  • Frameworks

    UIKit, iOS SDK, Redux, Core Location, Viper, ReactiveSwift, Core Data
  • Paradigms

    Test-driven Development (TDD), Dependency Injection, Mobile Development, Reactive Programming, Functional Reactive Programming, Coded UI Tests, Testing, Continuous Integration (CI), REST, Object-oriented Programming (OOP), Functional Programming, Model View Viewmodel (MVVM), Model View Controller (MVC), Requirements Analysis
  • Platforms

    iOS, Bitrise, Mixpanel, Firebase
  • Other

    Development, User Interface (UI), Debugging, Profiling, Carthage, Model View, iOS Animations, Code Architecture, UI, Animation, API Design, Video on Demand (VOD), Unit, Teams, APIs, Architecture, Technical Leadership
  • Libraries/APIs

    Firebase iOS SDK, CocoaPods, Alamofire, Fabric, Socket.IO, iOS Native Libraries
  • Tools

    Xcode, SwiftLint, Instabug, Fastlane, Optimizely
  • Storage

    SQLite, MySQL

Education

  • Master's degree in Computer Science
    2009 - 2014
    Technical University of Ostrava - Czech Republic
  • ERASMUS program (student exchange program) participant in Computer Science
    2012 - 2013
    University of Aveiro - Portugal

Certifications

  • Mobile App Security+ (iOS Edition) 

    JULY 2013 - PRESENT
    CompTIA

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