Vela Trading Systems Engineering interview questions

After I submitted my resume for an online posting for an engineering opening I got a phone call from from their second-highest employee inviting me to interview in person. I suggested that we talk first on phone whether the opening is a good fit and was told directly on phone that they'd prefer to not talk on phone and want to meet me in person. We scheduled a time a few days later by emails. I showed up for interview at the appointed time. I did not know at the time that this company is a 4-5 people operation with not even a full-time person to do HR. While the size in itself is not an issue, the owner and his associate displayed unprofessional behavior that an honest and professional person would avoid. Before the interview and while inviting me they said that they would immediately make a decision. That turned out not to be true and simply a lure enabling them to check me out. I am technically very strong and they saw that and did not ask me many technical question; the few they quizzed me on I knew inside out. I ended up interviewing them in person 3 more times at the same location with the same 3-4 employees. They wanted to make the offer in person. Every time when scheduling the appointment time they'd say they would make an offer today, and when I'd come to their office they made me wait for about half hour after the appointed time.Their tone while talking bordered on inappropriate. In hindsight I should have left at the first sign of the unprofessional wait time. However, as an interviewee I was focused on putting my best foot forward at the time and I did not grasp the level of un-professionalism at the time. While the owner's associate made me an offer well below my salary level then (even though they were fully aware of my salary history), he was interrupted very unprofessionally multiple times by the owner by hand signals outside the room. I found that very unprofessional. They made me offer that I answered with a polite "i will think about it" and left. The tactics employed by them uptil that point will be enough turn any good guy away.