Profile image of re4ct0r
Flag of Poland Skierniewice, Poland
Member since February 2, 2012
11 Recommendations


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I am a team leader, software architect and full-stack developer with 9 years of commercial experience including 6 years of full-time freelancing. My main skills include: ✓ Android apps ✓ iOS apps ✓ Deep learning and Google TensorFlow ✓ PHP/Python backends ✓ Amazon Web Services and complex server infrastructure administration ✓ Team leading multiple projects at the same time ✓ and much more I am not interested in small projects. For example I might not be able to build a Wordpress website much faster than other programmers. You can take full advantage of my skills when I work on very complex and big projects with multiple different technologies. This is where I can outperform other developers.
$50 USD/hr
104 reviews
  • 97%Jobs Completed
  • 100%On Budget
  • 100%On Time
  • 45%Repeat Hire Rate

Portfolio Items

Recent Reviews

  • image of Penn D. Write an Android application [Sealed]

    “This is an old project which I am closing out.”

  • image of Scott F. Project for re4ct0r -- 3 $30060.00 USD

    “Five Stars is not enough! re4ct0r consistently exceeds our expectations. He has a tremendous ability to understand BOTH the business requirement as well as the technical task. Because of this re4ct0r raises pertinent issues that shape the strategic direction of the project and then executes on the agreed solution in the most efficient way. He does in 1 hour what it takes lesser freelancers to do in a day (if at all). Our highest endorsement and true appreciation goes to re4ct0r!”

  • image of Scott F. Project for re4ct0r -- 2 $19020.00 USD

    “There is no better freelancer than re4ct0r. A true professional with the rare combination of top level skills, quick work, great communication, creative and strategic suggestions, and unquestionable integrity. Together it all equals the best value on This is why we have already begun another project with re4ct0r.”

  • image of Mike W. Project for re4ct0r -- 4 $3980.00 USD

    “re4ct0r always deliver a quality project. I have consistently rehired him for the knowledge, skills and high quality work. [05 July, 2016] Rafal is the type of Freelancer that makes the platform work. Good quality work every time. [19 July, 2016] re4ct0r has produced another excellent result. [17 August, 2016] Re4ct0r always provides a great result.”

  • image of Scott F. Project for re4ct0r $20400.00 USD

    “re4ct0r is an exceptionally skilled developer, an excellent communicator (his English is better than most Americans!), a thought leader, self-motivated, problem solver, able to prioritize and manage to deadlines. I have worked with re4ct0r every day for the last 8 months on an ongoing project and have been continuously impressed with his professionalism and commitment to delivering excellent work. Re4ct0r has earned our highest recommendation. [05 July, 2016] An exceptional job with a complex mission. We are happy to consider re4ct0r part of our team and will be working with him again and again. [18 July, 2016] Fantastic communicator and accomplishes tasks quickly”

  • image of Jim M. Project for re4ct0r -- 2 $720.00 USD

    “A top-quality coder, great to work with. I would highly recommend.”


Technical Lead

Mar 2018

Technical Lead

Freelance Software Engineer

May 2012 - Feb 2018 (5 years)

Android, iOS, PHP, Python, JAVA, C, C++, AWS, TensorFlow, Team Leading and many other things.

Software Engineer

Jun 2011 - Mar 2012 (9 months)

Graphics driver for mobile devices implementation. The driver was designed to run on Linux and Android platform. Involvement in tasks related to various parts and layers was necessary.

Junior Software Engineer

Jul 2009 - May 2011 (1 year)

Applications development mostly for Android but also a little bit for Symbian and iPhone. Responsible for various parts of applications from networking layers to UI layers.



2005 - 2010 (5 years)


Highest possible scholarship for 4 years in a row. (2010)

University of Lodz

I received highest possible scholarship for 4 years in a row for outstanding academic performance. I was one of the top students.


no publications


  • Numeracy 1
  • Game Physics 1
  • Android 3
  • Java Level 2
  • US English Level 3
  • HTML Level 1
  • iPhone Development 1
  • MySQL Level 2
  • PHP Level 3


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My Top Skills

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