Front-end: A few static sites (i.e. landing page) + Angular.
Back-End: A few C# APIs with Redis for caching.
Database: MongoDB + SQL Server.
Deployment: Docker Containers on Azure via DevOps Pipelines (one-click deployment).
Depends who you ask, it's considered quite low in Finance (Goldman Sachs is paying +£100k total. comp for front-office graduates now), but generally, outside of finance & fintech the salaries are quite low.
Ehh, mine are typically very valid, specific and informed questions. I'm blessed with very smart coworkers, but we are seriously understaffed and documentation is lacking. When you "own" very big lightly documented system, questions happen.