Hello,
We are a team formed with 3 high level competitive programmers. We worked in a lot of complex project in C and C++. We are also gold medalists and we have in total up to 2000-2500 problems on different sites like CodeForces, AC Timus, GeeksForGeeks. We are experienced in the fields that you mentioned.
We participate in almost 15 competitions(national and international) per year.
We think that we can deliver a quality job. Hope to hear from you soon. Have a nice day!