What is the ruling on working in a department that undertakes the receipt and assessment of usurious real estate mortgages for a specified amount?

What you mentioned in your two questions about facilitating the procedures for an interest-based loan for the applicant is considered cooperation in sin, which is forbidden, based on the Almighty's saying: "And do not cooperate in sin and aggression." As for whether the employee must leave the job: if he can avoid registering mortgages and assisting in them, and if his work does not directly involve forbidden acts or assisting in them, then there is no harm in him remaining. However, if his continued presence necessitates direct involvement in forbidden acts or assisting in them, then it is not permissible for him to remain, and he must leave.