Helpful context, since Jane Street may be an unfamiliar company to HN users: Jane Street is known as one of the companies with the most technically difficult interview processes, so that gives then a unique perspective regarding tech hiring.
In comparison to the Duke, Harvard, CMU (or similar level) grads the number of state school grads working there is minimal, especially with respect to who is hired out of school. Which is a shame, really - I'd be really interested in working in fintech/trading someday.
https://hn.algolia.com/?query=OCaml%20Jane%20Street&sort=byP...
It would be interesting to know how these private black box firms actually performed compared with the returns on a transparent security like the Vanguard S&P 500 fund.
Market making as a strategy is more like providing a service on the markets than it is like investing. You don't make money by holding a security until the price moves; indeed, you try to limit you exposure to the security as much as possible. Instead, you maintain offers to both buy and sell a security at any given time and make money on the differences between them (the "spread"). The main value you provide is liquidity, making it easier for other people to buy and sell the security quickly, rather than price discovery or the like.
While Jane Street does a lot of different things, they're mostly known for market making on ETFs. This makes them more a normal company that happens to operate on public markets than a fund of some sort.
I was pointing out that 'Market Making' is not always a good thing. In the broadest ters it increases costs for some trades, and decrease costs for others. So, it's not always good for the market.