LinkedInJanusz Gregorczyk

Janusz Gregorczyk

iOS Developer at Doist

Information Technology and Services
  1. AppwoRx LLC,
  2. Bright Mediums,
  3. Brothers Media
Recommendations3 people have recommended Janusz

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Currently my core interest is in iOS development. If you are looking for an experienced iOS developer I am your person. I am familiar with most aspects of iOS programming, including UIKit, CoreAnimation, OpenGL, GameKit, IAPs, CoreText, GCD, networking. I have developed about 40 iOS apps from scratch, and worked on many more.

Before that, I was a co-founder of Gameleons (in its prime time one of Poland's biggest mobile devs) and worked on over 50 mobile game titles. I have several years of programming experience on various platforms.

Specialties: native iOS development, Objective-C, Swift, CoreData


Senior iOS Developer

AppwoRx LLC
(1 year)

As a Senior iOS Developer at AppwoRx I worked on a 2.0 version of a clinical photography application.

Senior iOS Engineer

Bright Mediums
(1 year 7 months)Remote

As a Senior iOS Engineer at Bright Mediums I was responsible for development and maintenance of several challenging iOS projects.

Mobile Hero

Brothers Media
(4 years)

As an iOS developer at Brothers Media I developed several beautifully designed universal iOS applications.

Lead Mobile Developer

United Playcos
(3 years 9 months)Remote

Developed several iOS and Android applications, both for clients and self-published.

Technology Director, Co-Founder

Gameleons Sp. z o.o.
(3 years 10 months)

Managed development and R&D activities of one of Poland's top mobile game developers of the time. Involved in over 40 J2ME projects, from conception to post-production.

Developed several game engines, local bluetooth multiplayer solution, core porting technology.

C/C++ Programmer, Contractor

InterActive Vision Mind Beacon Sp. z o.o.
(10 months)

Helped to port two arcade simulator games from PC to Playstation 2 platform:
• Pacific Warriors 2
• Operation Air Assault
Work involved platform and compiler porting of large VC++ codebase to PS2/GCC, implementation of PS2-specific features, subsequent optimization and bugfixing.

C/C++ Programmer

InterActive Vision Mind Beacon Sp. z o.o.
(1 year 7 months)

Palm OS and Windows Mobile programming on a variety of applications.

Developed game backend, parts of user interface and various other components of a PC Game Airlines 2.


  1. Polish

    Native or bilingual proficiency
  2. English

    Full professional proficiency
  3. Spanish

    Limited working proficiency
  4. Italian

    Elementary proficiency
  5. German

    Elementary proficiency
  6. Russian

    Elementary proficiency

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