As far as I know that only applies to some front end system, but not for anything accounting related. Even modern trading and accounting software has a big rela

As far as I know that only applies to some front end system, but not for anything accounting related. Even modern trading and accounting software has a big relational database somewhere to ensure integrity of the inventory. Everything around that (trading models, development, research systems, reporting) can be microservices, but it will all rely on the core system.