Core banking solution upgrades is not an easy task as it's not a computer or some gadget where you might want all the latest and greatest features available along with latest bugs. Yes, bugs are also common especially with "dot zero" versions. Core banking solution actually is a heart of your financial institution or fintech and here you need stability and minimise risks as impacts could be devastating, if something goes wrong, and thus with a system at heart of your organisation you won't play just to get "latest and greatest". You are looking stability for your heart.
Core banking transformation programmes done well are a heart surgery on the bank, removing the dead tissue and replacing it with healthy vital organs. Done poorly, these programs are absolute buffoonery with practitioners not able to tell the difference between the healthy and the dead organs — and with the sharpest tool being a cudgel.
Where to start? When you tackle something as large and scary as a core banking transformation the question of where to start can be perplexing. In the history of my core banking transformation career I have seen different models used for different reasons.
In one of most recent projects, SEMTEXX team was involved in consolidation of 2 core banking platforms onto single platform after merger of 2 banks. It might sound simple - extract data from one and import data into another. Still you really think it is easy?