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No! not necessary
Not necessarily. It depends where do you wanna work. For example... You are a game developer and are working in a team that make games like Call of Duty, Battlefield, etc. Is important to know that you arm will stop when it achieve determined temperature, after many shots. This is Physic ! In this same example, if you're in a parachute, it's important to know how the fall velocity. It's important know how things work inside a fluid (water, for example). All of this is Physic ! But if you are a programmer, and youre making a software to find the number of bacterium in a experiment. So you should know a bit of Chemistry. Sorry, was the best examples that I have founded to give you. In general, you don't need to know Physics or Chemistry by now, but is very important you study Maths. Because two reasons: 1) In many codes you will need use vectors to achieve an accurate answers. You will need maths for that. 2) As coding, maths also will give you a logical reasoning. It's important to structure you code and make it short and functional.