Roman Temchenko, Software Developer in Toronto, ON, Canada
Roman Temchenko

Software Developer in Toronto, ON, Canada

Member since March 12, 2014
Roman is a top iOS engineer, familiar with all stages of software design and development. His true passion is in finding fast, efficient, and ingenious solutions for complex problems. He is an efficient and capable developer and a great person to work with.
Roman is now available for hire




Toronto, ON, Canada



Preferred Environment

Xcode, SourceTree

The most amazing...

...things I've done are recreations of many amazing pieces of software.


  • iOS Team Lead

    2016 - PRESENT
    DarkMatter, LLC
    • Led a team to implement an iOS client of a communication application with advanced security.
    • Managed and facilitated the work process of a distributed team of five developers with a 9-hour time zone difference.
    • Designed solution architecture and planned development activities in collaboration with other teams.
    • Communicated with stakeholders to identify product requirements.
    • Maintained and integrated multiple C/C++-based cross-platform libraries into the app.
    • Reviewed code and implemented best development practices.
    Technologies: iOS, Swift, Objective-C, C, C++
  • Senior iOS Developer

    2014 - 2016
    Lixar I.T.
    • Migrated an application from iOS 7 to iOS 8.
    • Implemented different new features for a client-server enterprise application using Objective-C and Cocoa Touch.
    • Implemented Core Data migrations in a fast-evolving application.
    • Supported test coverage for business logic using Kiwi.
    • Implemented receipt printing using StarMicronics printer SDK.
    • Designed architecture in a CLEAN way.
    Technologies: iOS, Objective-C
  • iOS Engineer

    2013 - 2014
    • Coded portions of server interaction logic and the corresponding data models.
    • Migrated the UI from iOS 6 to iOS 7.
    • Optimized project architecture, making it more flexible.
    • Created a custom image caching mechanism.
    • Implemented part of the UI.
    Technologies: iOS
  • iOS Engineer

    2012 - 2013
    • Implemented an advanced video player supporting HLS downloaded to a device.
    • Created a simple drawing system for annotating media items (PDF, images, and video snapshots).
    • Implemented anti-piracy protection and jailbreak detection.
    • Created and supported a custom URL protocol for interacting with HTML packages presented in an application and replacing the native UI.
    • Created a custom map view controller capable of switching between native maps and Google Maps in one line of code.
    Technologies: iOS
  • iOS Developer

    2011 - 2012
    • Implemented a user authentication and profile editing mechanism.
    • Improved application performance dramatically by updating poor legacy code.
    • Implemented xibless UI for a universal application.
    • Implemented map UI and interaction logic.
    • Learned design patterns.
    Technologies: iOS
  • Junior iOS Developer

    2011 - 2011
    • Implemented a XMPP chat client.
    • Learned manual memory management before ARC became mainstream.
    • Learned Cocoa basics, UIKit, and NSFoundation.
    • Worked with VCS and profiling tools.
    • Created a handy application with video playback featuring use of a gyroscope for juggling.
    Technologies: iOS


  • Teesnap (Development)

    21 century iPad application for golf-course management.

  • Mediafly (Development)

    I created the UI and internal logic for the video and audio playback, PDF documents, and image presentation. I developed a drawing instrument used for creating annotations, and implemented an algorithm for making the drawn line smoother. I also secured user data and downloaded content, anti-piracy protection. I also implemented interaction with a second screen, minor UI changes, and a custom URL protocol for interaction with stored HTML packages. This project allowed me to acquire experience working with RESTful services.

  • (Development)

    This is a universal application that did not use xibs. I optimized the data caching and retrieving, map view, map annotations, and overall UI interaction performance. I also handled authentication, registration, and the user info editing mechanism in the application, as well as the UI and server interaction.

  • Alcohoot (Development)

    I implemented part of the UI and interactions with Google Places API and Yelp API. Due to issues with places providers, I implemented custom map view controllers with the same interface so that native maps and Google Maps could be easily interchanged.

  • Finance Control (Development)

    This was one of the first projects in which I participated. Many things have changed since then, but I learned a lot during its creation.


  • Languages

    Objective-C, Swift, C, SQL, C++
  • Frameworks

    Core Data, Cocoa, Core Location, Cocoa Touch, MapKit, AV Foundation, UIkit
  • Tools

    Xcode, Git, Subversion (SVN), Mercurial
  • Paradigms

    XP, Object-oriented Design (OOD), Scrum, REST, Test-driven Development (TDD)
  • Platforms

  • Storage

  • Other

  • Libraries/APIs

    Core Animation, Google Calendar API, Google Maps


  • Master's degree in Computer Engineering
    2006 - 2011
    Dnipropetrovsk National University Oles Honchar - Dnipropetrovsk

To view more profiles

Join Toptal
Share it with others