Not quite, but I've hacked on various programming language related projects: * Helped write a C++ bindings library for Ruby. I was finally getting sick and ti

Not quite, but I've hacked on various programming language related projects: * Helped write a C++ bindings library for Ruby. I was finally getting sick and tired of doing everything in C++, and paying the cost in undefined behavior and compile times, but hadn't given C# a proper try yet. Bugs in the C API for exception handling eventually convinced me to abandon the project IIRC, but we had something functional. * Company-internal modifications to a C++ bindings library for Squirrel, Sqrat. Bugfixes for UB, adaptations for custom smart pointers, logging, replacing exception-throwing logic in later versions... was at a company using it professionally and was encountering bugs, compatibility issues (we couldn't compile with exceptions enabled for all platforms), and poor debugging support (which I 'fixed' by adding a lot of dumping options for callstacks and the like.) * Wrote a flash bytecode rewriter utilizing RABCDAsm. This wrapped all method calls - and statements within methods - in additional logic to track the current callstack. Our flash embedding solution didn't let us debug flash very well, but these modifications let us get real callstacks for unhandled exceptions and other errors. As a bonus, I was able to reuse much of the logic for a simple tracing profiler of sorts.