My services


Development, according to best practices and latest standarts. Automated and manual testing.

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Production server(cluster) setup. Deploying project to production server. Configuration of autoupdating. Party 🙂

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Full support of project including ASAP fixes and future improvements.

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Roman (RCooLeR) Derevianko

Roman (RCooLeR) Derevianko

I’m Roman Derevianko, a Ukraine based web developer. I passionately move pixels and lines of code to craft clean, responsive, and user-friendly websites. My current weapons of choice are PHP, WordPress, Yii, jQuery, MySQL and much more. Being both an ux-designer,engineer and SEO specialist, I help clients bring their ideas into reality. Contact me today and I would love to hear about your business


  • Master of Computer Science, Faculty of Mathematics and Computer Science, Precarpathian National University, Ivano-Frankivsk, Ukraine, 2009
  • Cisco CCNA-I (Ukraine)( Administration and development of networks), 2009

Work Experience

  • September 2009 – May 2012: Computer Science teacher;
  • September 2008 – June 2012:  Frilance;
  • June 2012 – May 2016: web-developer at LETZGRO.
  • May 2016 – Present : Freelance






Yii / Yii2



Server/cluster setup


Best development team

Being an experienced website developer, I am ready to help my clients with even the most challenging projects.

I work with talented and skilled teammates. These developers never stop learning and increasing their experience in different areas of development.


  • Nick Darling

    Roman is a very skilled and talented developer who is also a pleasure to work with. Not only is he an amazing developer, he has a great eye for detail and is a relentless problem solver. Roman is very innovative and forward thinking and has come up solutions and fresh ideas that have far exceeded our expectation. He always has a good attitude and speaks the English language very well, he is an A+ offshore developer. He always makes himself available no matter what time it is and is usually able to solve problems within an hour or less of them occurring. He is passionate about his work and he is always extremely knowledgeable of even the most cutting edge of web technologies which makes him a great asset to any development project. Roman helped us consolidate websites for 11 companies we had acquired as well as setup and configure a complex marketing automation system. He developed the entire backend of a very complicated website to spec with a very aggressive timeline and did so with a good attitude the whole time. I would recommend Roman to anyone looking to build a medium to large enterprise level website any day.

    Nick Darling Lead Developer at Decision Resources Group
  • Hai Vo

    Roman is a very caring an responsible person. His experience, commitment to client and communication skills have shown me that he is a great developer that understands the broader perspective of client needs. I truly love working with Roman on projects…. it gives me trust that the client is taken care of.

    Hai Vo at Lezgro, Budhida, 3DSolutions LLC
  • Dmitriy Lebedev

    Роман был ведущим разработчиком в одном из наших проектов. Он – специалист высокого уровня, очень организованный и ответственный. Могу смело рекомендовать его всем, кто ищет хорошего backend-разработчика в свою команду.

    Dmitriy Lebedev at Detonate Ventures