I don't work there any more so its pretty hard to write about it without the code in front of me. They were intending to open-source some of the more generic systems if they ever got time. Maybe if you gave them a nudge they would at least write about some of it: https://smarkets.com/about/contact/

I did write some vaguely related stuff about the benefits of their declarative web framework here: http://scattered-thoughts.net/one/1280/511009/453845. I may also ask if I can open source the transactional actors library I wrote there. That would probably be worth writing about.