Not sure why salary data needs to be so secret. I think it is important for potential employer to understand how much an employee is willing to work for . For one thing they not going to approach you with lower salary then they know about. This eliminates a set of employers who cannot afford you and save a lot of time for everybody. Employer will obviously offer as low as they can (what would you do yourself in this case) but if you are unhappy with the offer you just don’t accept. It looks a important however to understand your “market value” but this requires getting multiple offers.
Is it HFT or algorithmic trading? In my view HFT is a based on arbitrage between exchanges. If so my experience is negative. The price fluctuations are too small to compensate for fees (0.5%) and most of the exchanges have no arbitrage within say 250ms interval.
HFT is quite rarely about arbitrage, in fact (at least not directly).
I don't do arbitrage (there are easier ways that I hadn't fully exhausted yet), but between e.g. OKCoin and GDAX 30-second delays are common every day.
The best way of dealing with the fees is not paying the fees. ;)
