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Rafal Roszak

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Flag of Poland Skierniewice, Poland
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Member since February, 2012

- Android applications development. - PHP development. - C, C++, JAVA development I am a developer with 6 years of commercial experience including 3 years of full-time freelancing. I always try to understand your needs and often make my own suggestions before starting the project in order to reduce your total costs as much as possible and to bring the project to completion with a result the exceeds your expectation. Summary of my skills: - Android applications development - PHP and Magento development (I have worked over a year on Android project with Magento backend doing work both on Android an Magento side) - C, C++ development Android skills: - inventory management (QRcode/barcode scanning, products/orders/shipments management, Magento backend) - 2d game development (game physics, collision detection and handling, level design, original game ideas, AndEngine) - calling web services apis (XML-RPC, SOAP, Google APIs and any other kinds of APIs) - NFC (Mifare Classic, Mifare Desfire EV1) - GPS - RTSP, RTP, RTCP, - on-board diagnostics plugins for Torque Pro application - custom launchers - facebook SDK - in-app billing - using a lot of different 3rd party libraries that make development easier (Picasso, StaggeredGridView, and many many others) - experience with various ad networks (AdMob, TapJoy, Kiip, AirPush) - using SQLite databases in Android apps - transfer of data between 2 devices using speaker and microphone only - all kinds of different things that can be implemented in android app (action bar, notification bar, complex layout/views hierarchies, background services, accelerometer/gyro and other sensors, vibrations, launching app on boot, networking (3G/WIFI/bluetooth), file system manipulation, encryption, compression, speech recognition, text-to-speech, use of camera/speaker/mic and many other things) - publishing my own apps on google play account (one of my apps has over 250000 downloads) - making money from ads in android apps PHP skills: - magento development knowledge - developing web services - website backends - scripts doing all kinds of things C++ skills: - I have written a C++ server with MySQL backend + some Android apps that work as clients. This was a proof of concept for much bigger surveillance system to be developed in the future. Clients communicate with the server using ONVIF interface. Other skills: - EvoStream Media Server - ONVIF - Amazon S3 - NES console emulators (I have written my own) - Sufficient knowledge about graphics design and experience with using GIMP and Photoshop. In some cases I can replace your graphics designer completely while at the same time developing Android app for you and taking care of the server administration and source code of web services.

5.0 / 5
7.3 / 10

@re4ct0r

  • 83%Jobs Completed
  • 100%On Budget
  • 100%On Time
  • 41%Repeat Hire Rate

Recent Exams

  • Game Physics 1 Top 1%
    95%
  • Numeracy 1 Top 1%
    100%
  • Freelancer Orientation Top 2%
    85%
  • Android 3 Top 4%
    85%
  • HTML Level 1 Top 5%
    83%
  • MySQL Level 2 Top 10%
    83%
  • Java Level 2 Top 14%
    85%
  • PHP Level 3 Top 19%
    78%
  • US English Level 3 Top 27%
    83%

Top Skills

  • Android
  • Mobile Phone
  • PHP
  • MySQL
  • C++ Programming
  • Software Architecture
  • GPS
  • Electronics
  • Game Design
  • C Programming
  • Java
  • XML
  • Data Processing
  • Data Entry
  • Excel
  • Wordpress
  • CSS
  • Magento
  • Software Testing
  • Web Search
  • Shell Script
  • HTML5
  • HTML
  • jQuery / Prototype
  • OpenGL
  • JSP
  • Javascript
  • Script Install
  • Linux
  • Delphi
  • AJAX
  • Testing / QA
  • SQL
  • Cloud Computing
  • Algorithm
  • Freelance
  • Microcontroller
  • Apache
  • Zend
  • GPGPU
  • CUDA
  • Amazon Web Services
  • Mathematics
  • Psychology
  • Debugging
  • Physics
  • Web Hosting
  • Ubuntu
+ show more

Recent Reviews

  • image of MikeW68 mobile to web app software - establish preferred approach $150.00 AUD

    “Re4ct0r has an exceptional grasp of the clients needs, is meticulous and provides great value. I have already rehired for another project”

    MikeW68 Flag of Australia 1 month ago.
    • PHP
    • Mobile Phone
    • Android
    • MySQL
    • C++ Programming
    • Hire me
  • image of VelDev android development 2 $2550.00 USD

    “Excellent work as usual”

    VelDev Flag of Romania 3 months ago.
    • Android
    • Hire me
  • image of omegasea21 On going android work cont. $5010.00 USD

    “Amazing job, perfect android coder, the best around! thank you.”

    omegasea21 Flag of United States 3 months ago.
    • Mobile Phone
    • Android
  • image of abhishekperk Customer App for retail payments $1000.00 USD

    “Excellent”

    abhishekperk Flag of Netherlands 5 months ago.
    • Android
    • Hire me
  • image of abhishekperk Customer app update $375.00 USD

    “On time and perfect code”

    abhishekperk Flag of Netherlands 5 months ago.
    • Mobile Phone
    • Android
  • image of omegasea21 Ongoing Android Work $925.00 USD

    “Excellent coder, amazing job on our android app.”

    omegasea21 Flag of United States 5 months ago.
    • Android
    • Hire me

Experience

Freelance Software Engineer

May 2012

- Android applications development - PHP and Magento development (I have worked over a year on Android project with Magento backend doing work both on Android an Magento side) - C, C++ development

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.

Education

MSCS

2005 - 2010 (5 years)

Certifications

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

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

Publications

no publications

Badges

  • Essential Credentials

    Update your account details 100%
  • Simply the Best

    Complete 5 or more projects, with a 95% completion rate.
  • Perfectionist

    Receive 5-star ratings in 90% of your completed projects (minimum 10 projects).
  • The Achiever

    Accept 50 projects.
  • The Collector

    Reach a balance of 5,000 credits.
  • The Multi-tasker

    Complete 40 projects.
  • Fast Responder

    Bid within 2 minutes of a project being listed.
  • The Cap-tain!

    Reach the level 20 level cap!
  • The Spartan

    Bid on 300 projects.
  • The Regular

    Log in every day for 1 week.
  • Neighbourhood Watch

    Reporting a user who violates our terms of service
  • Mover and Shaker

    Create 50 Milestones.
  • Warren Buffet

    Complete a project worth over $1000 USD.
  • High Roller

    Complete a project worth over $500USD (or equivalent) on Freelancer.com.
  • Smooth Operator

    Complete 10 projects on time.
  • Nine-to-Fiver

    Win a project and accept the offer.
  • Feedback Guru

    Receive 10 reviews
  • The Economist

    Complete 10 projects on budget.
  • The Critic

    Post 10 Reviews.
  • Smart Money

    Create 10 Milestones.
  • Straight A's

    Earned a score over 90% (Minimum 3 exams)
  • Pro-Profile

    Complete your Profile 100%.
  • The Speculator

    Sponsor 1 bid.
  • The Enforcer

    Reporting a project or contest that violates our terms of service.
  • The Prospector

    Post your first project.
  • Look-At-Me

    Highlight 1 bid.
  • US English Expert

    Pass the US English Exam (Level 3)
  • US English Pro

    Pass the US English Exam (Level 2)
  • US English Qualified

    Pass the US English Exam (Level 1)
  • US English Expert

    Pass the US English Exam (Level 3)
  • US English Pro

    Pass the US English Exam (Level 2)
  • US English Qualified

    Pass the US English Exam (Level 1)
  • All Star

    Receive a 5-star rating for a project.
  • The Adventurer

    Complete your first project.
  • The Perfectionist

    Edited a bid.
  • The Seeker

    Bid on 20 projects.
  • The Verified

    Verify your payment method
  • The Collector

    Reach a balance of 5,000 credits.
  • Mover and Shaker

    Create 50 Milestones.
  • Warren Buffet

    Complete a project worth over $1000 USD.
  • US English Expert

    Pass the US English Exam (Level 3)
  • US English Expert

    Pass the US English Exam (Level 3)
  • Simply the Best

    Complete 5 or more projects, with a 95% completion rate.
  • Perfectionist

    Receive 5-star ratings in 90% of your completed projects (minimum 10 projects).
  • The Achiever

    Accept 50 projects.
  • The Multi-tasker

    Complete 40 projects.
  • The Cap-tain!

    Reach the level 20 level cap!
  • The Spartan

    Bid on 300 projects.
  • High Roller

    Complete a project worth over $500USD (or equivalent) on Freelancer.com.
  • Smooth Operator

    Complete 10 projects on time.
  • The Economist

    Complete 10 projects on budget.
  • Smart Money

    Create 10 Milestones.
  • Straight A's

    Earned a score over 90% (Minimum 3 exams)
  • US English Pro

    Pass the US English Exam (Level 2)
  • US English Pro

    Pass the US English Exam (Level 2)
  • All Star

    Receive a 5-star rating for a project.
  • Essential Credentials

    Update your account details 100%
  • Fast Responder

    Bid within 2 minutes of a project being listed.
  • The Regular

    Log in every day for 1 week.
  • Neighbourhood Watch

    Reporting a user who violates our terms of service
  • Nine-to-Fiver

    Win a project and accept the offer.
  • Feedback Guru

    Receive 10 reviews
  • The Critic

    Post 10 Reviews.
  • Pro-Profile

    Complete your Profile 100%.
  • The Speculator

    Sponsor 1 bid.
  • The Enforcer

    Reporting a project or contest that violates our terms of service.
  • The Prospector

    Post your first project.
  • Look-At-Me

    Highlight 1 bid.
  • US English Qualified

    Pass the US English Exam (Level 1)
  • US English Qualified

    Pass the US English Exam (Level 1)
  • The Adventurer

    Complete your first project.
  • The Perfectionist

    Edited a bid.
  • The Seeker

    Bid on 20 projects.
  • The Verified

    Verify your payment method