The C++ Developer role at MARGO involves the development of a key application for the front office of an investment bank, crucial for real-time risk assessments and position management. The candidate will engage in optimizing code and enhancing functionalities, focusing on multithreading and performance. Required qualifications include a Bac+5 education, proficiency in C++, and experience in critical systems and real-time data processing, with a preference for those with a background in finance.