My point is that a market maker will not carry an option position that is impossible to hedge due to the underlying liquidity. In other words, he will not carry a gamma position that is not "in line" with the liquidity of the underlying.
I may be wrong, but the article is about buying a lot of short dated (high gamma) call options from a market maker and hoping that he will drive the market up while hedging his position.
Market makers are not only motivated by commissions.
Before making a price they will consider multiple factors, liquidity (of the underlying and the derivative) is an extremely important one. They likely will not carry a trade that is impossible to hedge (because the underlying is not liquid enough).
I will reply for the quantitative developer role, given your description I suppose that it's what you are looking for.
Succinctly, I would say that it's a strong computer scientist/developer highly interested in finance to be able to understand/discuss/implement business requests.
It's important to be able to work under pressure (when there is a problem on an automaton for instance, etc.). It's also important to be able to frequently switch between tasks.
I would not say that you have to be extra smart.
I started as a computer scientist in a bank, turned quantitative developer and then trader a couple of years later.
I did not have to, I had the chance to be the "natural choice" when a trader left the desk.
I joined the desk as a computer scientist. They quickly gave me the opportunity to develop the strategies with them and thus to understand/know the business.
At the bank for which I was working, this kind of move is not uncommon.
Because it's not only a matter of salary, you have to put "all in the balance" when considering a potential move. Personally, I was giving a lot of value to the mobility within the company.
I started as a computer scientist in a bank and became a trader a couple of years later.
Outside of my company, it would not have been possible because I didn't study finance.
It took me a while to figure out that I should drag the headline left or right. I first tried to click the red "fake" and green "not", I tried to click on the headline, etc.
I then realized that it was written in the light grey message to which I was not paying attention.
It may be my fault, just giving the feedback in case it can help to improve the UX.