This condition is called Incomplete Red-Green blindness and is more common than people realise. This is an inherited condition and present in about 8% of men and 1% of women.
You are born with it and you may have other blood relatives with this condition. You will have no difficulty in identifying colours separately but only when it is mixed with various hues. I myself detected this condition when experimenting with charts when I was a medical student but it has not stopped me from doing anything. Practical difficulties that you may face are trying to match tie with a shirt or carpet with a curtain, etc. You will not have any problem identifying traffic lights either. This is a static condition and does not get better or worse ever.
Railway drivers, airline pilots and telecom engineers are not allowed with this condition, as they have to deal with critical subtle colours. You should not have any difficulty with your work. Only thing you must know, is you need good preferably daylight to distinguish fine differences in colour.
There are several tests to detect colour blindness but Ishihara is still simplest and best.
I think this should not affect your job but only your company can say its requirement. If they don't notice or enquire about this condition you don’t have to mention it yourself.