What is the ruling on joining the Engineers Syndicate and working in companies that require employees to have insurance or retirement plans, knowing that these systems may invest their funds in usurious fields? And is this considered a case of necessity?

Voluntary enrollment in social security is impermissible if it invests the participants' funds in unlawful (haram) activities, or if its system is based on gharar (excessive uncertainty) and gambling. The solidarity fund must adhere to Sharia-compliant regulations. However, if the engineer is obliged to register with the syndicate and is compelled to join this social security, there is no sin upon him, as this constitutes a need that takes the place of necessity.