An insurer's estate is a record of every product it has ever sold. Policy administration platforms accumulate rules for products that are closed to new business but still in force, and those rules cannot be removed while a single policy depends on them.
Claims platforms grow similarly, and the two are frequently of different generations, integrated by batch transfers that were expedient at the time. Underwriting, distribution and finance then draw from both, usually through extracts that each apply their own interpretation.
The consequence is an estate where product change is slow, where the same customer appears differently in different systems, and where answering a regulator's question about how a figure was produced requires an investigation. Our work is usually about making the rules legible, deciding what is mastered where, and modernising in increments that do not require the whole book to move at once.