Disclaimer: We offer to develop a crawler you ask for in Ruby as a headless (no web frontend) application. Nevertheless I would be grateful if you could consider our bid.
I lead a team consisting of UI/UX, backend developers and network/system administrators/programmers. For several years, using Ruby on Rails we have been developing dedicated web applications for companies - from simple websites, online shops, through sales platforms, CRMs, up to ERP class solutions to manage people, manufacturing, etc. We work on the frontend as well as backend side building APIs, we integrate with external systems and APIs (online payments broker, image banks, Google Analytics, …) to process subscription, activate additional services, and so on. On a daily basis we also develop our custom administration scripts, application and bots.
Please feel free to contact me in case you need more info.