public void DeleteProfile(int developerId)
{
var skills = skillRepository.GetByDeveloperId(developerId);
skillRepository.DeleteList(skills);
developerRepository.DeleteList(skills.Select(s => s.Developer).ToList());
stackRepository.DeleteList(skills.Select(s => s.Stack).ToList());
technologyRepository.DeleteList(skills.Select(s => s.Technology).ToList());
}