I was an i-banker and I still know a lot of them.
First of all, i-banker is a catch all term that actually covers a huge range of vastly different jobs. I would advise your DS to do lots of research on the internet to understand the different roles and which one he might be best suited for. For example the investment bank grad scheme I joined had everyone from currency traders to equity research analysts to corporate financiers to portfolio managers. All those roles have completely different working hours, pay scales, types of work, personalities, career prospects…. He should read Bombardiers by Po Bronson, Liar’s Poker by Michael Lewis; Monkey Business: Swinging Through the Wall Street Jungle by John Rolfe and Peter Troob; and finally City Boy Fear and Loathing in the Square Mile by Geraint Anderson, which are great insights into what different types of i banking are like, pros and cons.
The good news is that most investment banks and big fund managers run open days for would be apprentices and graduate entrants (ie 17-21 year olds) where they explain all this stuff and your DS can ask lots of questions and actually meet people who do these jobs. Diversity and inclusion (D&I) is a huge deal now for financial services so most are making an effort to target these open days to groups that are traditionally underrepresented eg women or people educated in state sector. However it is still absolutely key to do research on the websites/read the Financial Times before you go, attend the open days, look smart, ask sensible questions, make some good contacts and follow up on these.
The next stage is applying for summer internship schemes, and then for either an apprenticeship or graduate entry depending on whether your DS wants to go to university. There are a surprising number of apprenticeships in FS - although most of the more technical roles eg economists or quant analysts are only open to people with degrees or even postgrad degrees. If you want to work in corporate finance (sometimes known as M&A) then you will need a degree too.
The other bit of good news is that nepotism is much less of a thing than it ever was - partly because of D&I and also because most of these schemes are run by HR and have strict processes and scoring in place for evaluating applications. If your DS is bright, hardworking, have plenty of self confidence, and show genuine interest in finance then he stands a good chance.
Having said that, due to sheer numbers of applications, there’s no doubt that it helps if he a) goes to a Russell Group university and is studying a mainstream academic subject (doesn’t have to be business or finance, but definitely not media studies) b) has excellent A level results c) speaks one or more foreign languages.
OK now the bad news.
In some parts of investment banks, some bad stuff happens. Much much less than it used to, because US firms are so worried about lawsuits, but still. Like football players or pop stars, if you give young people a lot of money and put them under a lot of pressure they tend to go a bit mental. (See: the BBC drama series Industry). Traders with plenty of spare time traditionally have done drugs, fast cars and strip clubs. Corporate finance types (which they started off portraying in Industry but then stopped because it is actually too boring for TV) do different kinds of drugs to help them work 24/7 and develop very unpleasant personalities. In the case of older male corporate financiers, that often turned into serial infidelity, preying on junior female staff, Weinstein style, and bullying.
I would not recommend corporate finance to any child of mine as it’s totally incompatible with having a family life. In corporate finance at Goldman Sachs they are expected to work “a minimum of five days in the office” a week - 100 hour weeks are not uncommon. Nor trading, because I think the trading mentality often leads into gambling problems. See this from the FT on.ft.com/3dJrnhL
However there are other front office roles which are better - eg being an equity research analyst if you are a thoughtful type can be not too bad. Being a portfolio manager is GREAT in terms of work/life balance. ESG is a growing area for people who want to use finance to make a difference in society. Or there are opportunities in operations, IT, finance, HR, marketing within investment banks…you will still be paid well and professional expectations will be accordingly high, but the remuneration and lifestyle isn’t so extreme.