Roman Semenenko

Roman Semenenko

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

Kiev, Ukraine



What's the difference

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 1 portfolio piece. Create an account to review them.

Work History & Feedback

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 hrs @ $33.33/hr
Earned $2,355

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 hrs @ $34.44/hr
Earned $39,544

Back-end Ruby on Rails Developer

“He wasn't available enough for my needs.”
3 hrs @ $33.33/hr
Earned $100

Modify Python Script

“Excellent work. He went above and beyond what I asked and did it faster than promised.”
Fixed Price $100

Scraping / Optimization Program

“Fantastic Rails programmer. Am using on a follow on project currently.”
Fixed Price $144

Create Interface to integrate Python module with Ruby website

“I was very happy with Roman's work. He was quick to respond and performed high caliber work. The deliverable was exactly what I expected. I would have given him 5 stars, but the communication at the end became a bit difficult as he had email account troubles.”
Fixed Price $235

Help moving from Rails asset pipeline to Gulp

Job in progress

6 hrs @ $55.56/hr
Earned $333

Chrome App using React.js with bluetooth and serial connections

Job in progress

53 hrs @ $55.56/hr
Earned $2,759
Tests Taken
Name Percentile Score

Javascript Test


Ruby on Rails Test v2 (Old)


Unix Test