Actually the data is mostly irrelevant. The tooling and engineering are what's important. I've worked across Finance, Retail, Insurance, Telco etc and more oft

Actually the data is mostly irrelevant. The tooling and engineering are what's important. I've worked across Finance, Retail, Insurance, Telco etc and more often than not the data requires deep domain knowledge which would take months of full-time education to understand. Nobody bothers with it. Analysts and Domain Experts will figure out the calculations and pipelines whilst the Data Engineers are responsible for ensuring everything works.