upgrade de vitiger versión 5.4 bajo CentOs a versión 7.1 o actual

Hi there, I’d like to be considered for your project. I’m a vtiger developer. For 10 years I’ve worked in development and so I am accustomed to working with all type of vtiger customization and integration . I have a deep passion for learn new technology and apply in my project wherever required. I highly value professionalism and hold myself strictly accountable to represent my client’s brand. I aim to form a long-term working relationship. I need to see your database and how much customisation are there in current version so that I can tell you proper price and timeline. Thank you for your consideration. ChaitaliDebnath