C++ Software Development Engineer, backend systems

My client is looking for a server side software Engineer to work on networked windows services for in house telephony systems. Key skills C with C++ coding skills 2.1 or above in Engineering, Mathematical, Scientific, Computer Science or related field. Experience in the designing and building scalable, real-time responsive systems Multithreading Networking telephony protocols for Windows environments Any cloud exposure would also be highly beneficial. The successful candidate will work from requirements / specification, architecture, design, code, test, delivery and support.