Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.

 

Commercial insurance is prohibited in Islam due to a number of reasons:

1. It mostly involves usurious interest.
2. It includes some forms of gambling.
3. It includes transactions which have forms of uncertainty.

As long as it is haram to have or deal with commercial insurance, it becomes impermissible to work in an insurance company which provides all or any forms of unlawful transactions.

Allah Almighty knows best.