The first 3 years of my career was spent as a quant developer. Mostly Java, C++, and VBA. I started in 2006, ten years ago now and was damned good: advanced - expert level.In 2009 I landed my first quant role: MBS/ABS valuations, and then after that, market/credit risk management. There was always a programming component to my work, but programming was now a tool, not the commodity. I used whatever language was best suited for the job: Perl, Python, VBA, R, Matlab, C++, Java, DOS batch, Linux bash. It got to the point that whatever tool I was using, I'd Google stuff like what the inequality operator was for that language, and go on merry way.I was offered interviews at some trading firms and hedge funds, but most of the roles are very "programmy". I'm worried that my C++ is too rusty.Any ideas on how to efficiently review an entire programming language at the level required for these kinds of firms?