Roman Semenenko
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Roman Semenenko

Senior full-stack web developer, Devops, currently focused on React.js


Kiev, Ukraine


Challenge me! Backend ( Ruby/ Python for 5 years ) turned Frontend developer. Used React.js for a day-job project for almost 2 years, now it's all the rage and I have tons of experience with it! React.js, Webgl, Clojure, Clojurescript particularly welcome.

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

Work History and Feedback

  • Jun 2013 - Jan 2015

    Ruby On Rails Developer

    No feedback given

    117 hours
    $55.56 / hr
    $6,519.04 earned

  • Jun 2013 - Jul 2013

    eReader Application Developer
    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

  • Jan 2009 - May 2013

    Simple Web Site with Bidding and Messaging Capabilities

    No feedback given

    $222.22 earned
    Fixed Price

  • Jan 2009 - May 2013

    Math Algorithm Implemented In Ruby

    No feedback given

    13 hours
    $27.78 / hr
    $347.25 earned

  • Mar 2011 - Jan 2012

    Sr. Ruby on Rails Developer
    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

  • Jan 2011 - Mar 2011

    Central Authentication System in Ruby
    The freelancer has made this comment private
    $566.67 earned
    Fixed Price

  • View More (9)

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Name Score (out of 5) Time to Complete
Ruby on Rails Test v2 (Old) 4.55 Top 10% 19 mins
Unix Test 4.50 Top 10% 15 mins
Javascript Test 4.10 Top 20% 26 mins
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Work History

100% Job Success
1,609 hours worked
34 jobs


Less than 30 hrs/week
24 hrs response time

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