I have 4 years of experience fully into ROR & Ruby. Past 8 months I am into financial domain creating the front end for multiple clients. Major challenges include data sync and API's. Multiple 3rd party integration for verification as well as bank integration with Front End is the mile stone in the last project.
Apart from development I have extended to R&D side to fine tune the script and keeping the security levels as to the expectations. This resulted in faster loading of the pages with good levels of security and eventually good results...