I've been contracting in the finance industry in London for seven years (at four firms) and although financial companies are some of the biggest users of open-source software, it's almost unheard of for firms to contribute back to open-source projects. There are a few progressive companies but unfortunately I've not worked at any of them.
Many firms have a strict policy of disallowing any source (open or not) from leaving company premises. Email servers and proxy filters have detectors that will raise an alert if source code is emailed or sent out over HTTP. It's easily a sackable offence and this discourages developers from contributing changes back to open-source: there are simply too many hurdles to jump through in order to do it.
Given your experience, what would you say are the top 5 techs that are being used in this area in London? I was looking at the job market a while back but it's not very transparent. How do you best go about finding a job of this kind?
Many firms have a strict policy of disallowing any source (open or not) from leaving company premises. Email servers and proxy filters have detectors that will raise an alert if source code is emailed or sent out over HTTP. It's easily a sackable offence and this discourages developers from contributing changes back to open-source: there are simply too many hurdles to jump through in order to do it.