What is the ruling on joining a faculty of engineering and working in the profession of electronic engineering, given the possibility that the developed technologies may be used in fields that violate Islamic Sharia, knowing that the desire is to avoid aiding in sin or earning an unlawful income?

What you mentioned about the possibility of using devices manufactured in haraam (forbidden acts) does not necessitate the prohibition of their manufacture, maintenance, learning about them, or teaching them. This is because such possibilities are remote pretexts that the Shariah did not command to block. If one were to say they should be blocked, it would lead to the prohibition of many permissible things due to the possibility of them leading to haraam. The basic principle concerning all things is permissibility until a reason for prohibition becomes clear.