The so-called two cores are underwriting and indemnity, which are the key businesses of insurance companies. In layman's terms, you decide whether a client company should underwrite or not, and decide whether a compensation company should pay or not. This work is quite important.
As for the development space, it doesn't depend on your work, but on your connections, you know.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.