Optiver Core Applications Developer interview questions

Applied on company website. progress was quiet fast. First coding test. then skype interview and then face to face interview. HR seems very professional at first glance. However they lost my respect when they declined me by saying that they are looking for software developers who have also networking knowledge/experience. This was not listed on their job advertisement! So, be careful before you put some effort on this process. Bytheway, environment seems very friendly and comfortable. Seems like face paced company with a stable business.