What is the ruling on mixed summer training and educational courses in companies that help improve one's CV to obtain a job, with an attempt to avoid mixing as much as possible? And what is your comprehensive clarification of the ruling on mixing?

If mixing [between genders] in companies is prohibited, then it is not permissible to join them for training, unless the Muslim is in dire need of the training and cannot find another place free from Sharia prohibitions, and is safe from fitna. In such a case, the need is estimated according to its extent, and the permissibility ceases when the need ceases.