Roman Semenenko
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Roman Semenenko

Senior full-stack web dev, currently focused on React

$75.00/hr

Kiev, Ukraine


Roman Semenenko has added 2 portfolio pieces. Create an account to review them.

Challenge me! Backend ( Ruby/ Python for 5 years ) ... moreturned Frontend developer. Have been using React.js for almost 3 years, it's all the rage now and I have tons of experience with it! React.js, D3, ClojureScript particularly welcome. less

Overview

Challenge me! Backend ( Ruby/ Python for 5 years ) turned Frontend developer. Have been using React.js for almost 3 years, it's all the rage now and I have tons of experience with it! React.js, D3, ClojureScript particularly welcome.

Roman Semenenko
Drop Here

Roman Semenenko

$75.00 /hr

Senior full-stack web dev, currently focused on React

Kiev, Ukraine

Overview

Challenge me! Backend ( Ruby/ Python for 5 years ) turned Frontend developer. Have been using React.js for almost 3 years, it's all the rage now and I have tons of experience with it! React.js, D3, ClojureScript particularly welcome.

Roman Semenenko has added 2 portfolio pieces. Create an account to review them.

Work History and Feedback

  • Help moving from Rails asset pipeline to Gulp

    May 2015 - Present
    Job in progress

    6 hours

    $55.56 / hr
    $333.36 earned

  • Chrome App using React.js with bluetooth and serial connections

    Apr 2015 - Apr 2016
    5.00
    Roman is extremely and competent as a developer. He's easy to work with and produces quality code which is maintainable and as future-proof as one can expect in today's ecosystem of Javascript tooling and libraries. I wouldn't hesitate to hire him again.

    337 hours

    $55.56 / hr
    $18,723.72 earned

  • Ruby On Rails Developer

    Jun 2013 - Jan 2015
    No feedback given

    117 hours

    $55.56 / hr
    $6,519.04 earned

  • eReader Application Developer

    Jun 2013 - Jul 2013
    5.00
    Roman is an outstanding developer and a valuable, cooperative team member. He is very professional, efficient, trustworthy and reliable. We will definitely use him again.

    71 hours

    $33.33 / hr
    $2,355.32 earned

  • Simple Web Site with Bidding and Messaging Capabilities

    Jan 2009 - May 2013
    No feedback given
    $222.22 earned
    Fixed Price

  • Math Algorithm Implemented In Ruby

    Jan 2009 - May 2013
    No feedback given

    13 hours

    $27.78 / hr
    $347.25 earned

  • Sr. Ruby on Rails Developer

    Mar 2011 - Jan 2012
    5.00
    I have now completed two separate contracts with Roman, and he consistently exceeded my expectations and those of upper management, whom I included in meetings with Roman on several occasions. I have managed several dozens of consultants over the course of the past 15 years and I can honestly say that Roman ranks at the very top of my list. To complement his terrific technical (both architectural and development) skills, his command of the English language is better than most Americans, as he has used the English language for his entire life in addition to his native language. He is both a team player and an independent thinker. I look forward to hopefully working with him on future projects. Just super.

    1,176 hours

    $34.44 / hr
    $39,543.93 earned

  • Central Authentication System in Ruby

    Jan 2011 - Mar 2011
    1.80
    The freelancer has made this comment private
    $566.67 earned
    Fixed Price

  • Back-end Ruby on Rails Developer

    Jan 2011 - Feb 2011
    3.90
    He wasn't available enough for my needs.

    3 hours

    $33.33 / hr
    $99.99 earned

  • Modify Python Script

    Jan 2011
    5.00
    Excellent work. He went above and beyond what I asked and did it faster than promised.
    $100.00 earned
    Fixed Price

  • Scraping / Optimization Program

    Apr 2010 - May 2010
    5.00
    Fantastic Rails programmer. Am using on a follow on project currently.
    $144.44 earned
    Fixed Price

  • View More (6)

Roman Semenenko has more jobs to show. Create an account to review them.

Tests

NameScore (out of 5)Time to Complete
Ruby on Rails Test v2 (Old)4.55Top 10%19 mins
Unix Test4.50Top 10%15 mins
Javascript Test4.10Top 20%26 mins
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1,829 hours worked
34 jobs
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More than 30 hrs/week
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