Symmetry Investments, London, HK and Singapore but we also hire remote developers.
D language and functional programmers.  Julia for research
Symmetry Investments is a post startup c. 5bn alternative asset management company with around 175 people as local employees and remote consultants.
We are three years into a period of transformation from initially a fairly standard enterprise finance approach to technology to something new that recognises the importance of both humane and the technical for discretionary portfolio management and for the business of running a hedge fund.
It's not easy to integrate practitioners who may spend most of their day programming but are oriented towards solving their business problems with developers who are specialists in programming.  To achieve that we wrote a little functional DSL that's now in production.  Type inference of returns and parameters using inequality constraints is in a feature branch and there is plenty more to do on the language itself as well as the ecosystem around it. What might be a project in itself elsewhere can be just a set of SIL functions here.
It's quite a creative place where we encourage a degree of courage amidst practical constraints, and we are open to doing things a different way if it's commercially sound and in the interests of our investors.
The language is written in D, we hosted dconf last year and will do so again this year.  So we are looking for outstanding native code developers who would like to write D as well as people to work with practitioners writing SIL.  Also looking to write documentation and work on build.
We look for virtues and capabilities over only experience and credentials although those things aren't a disadvantage.
Compensation is currently not quite at Netflix standards but is generous to very generous over time by broad technology industry standards. We recognise and reward technical accomplishment and have a very flat structure.
I'm one of the three people running the firm, responsible amongst other things for technology across the firm and posting this myself, so that should give you an idea both about how seriously we take technology and about the culture of the firm.
Some Symmetry people:
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Or see GitHub and blog.dlang.org
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Email laeeth at kaleidic.io and cc jthompson at symmetryinvestments dot com.