The personality cliché in finance is the risk taking one. Men are more frequently found in riskier professions, including dangerous jobs like oil drilling.
Some fintech companies actually do produce a software product for finance. However, many of them work for banks or funds to generate capital gains beyond a wage or salary.
Regardless of personalities, the most important factor is profit. Everything else is secondary. It is not as flashy or famous as big tech companies, but this profit is paid in bonuses that far exceed the highest salaries for tech workers.
If you work for Netflix, maybe you get a free subscription. If you work for a restaurant, maybe you get a free box of takeout at the end of the day. If you work in the business of money, your incentive is large bonuses.