stevxstev,
micromass gave reference to an article about the use of color coding used in some engineering work. Some occupations require attention to colors and some do not. I suggested talking directly to currently-working engineers ( and now I suggest maybe other types of employed technology and scientific people).
An occupation which uses color coding can be expected not to use certain color-blind people. An occupation whose analyses or products are color-dependent would also be a bad fit for certain or most color-blind people. Someone wanting to perform color matching work for paints, pigments, or dyestuffs needs to be color-vision capable, not color-blind. A microbiology technician or scientist needs to be able to use color for cell staining. A chemist might need to be able to see a clear color change difference for an analytical procedure, and if colorblindness makes that color change or difference seem unclear, then the color-blind chemist cannot do this work satisfactorily. On the other hand, someone doing spectrophotometric work might be fine, since he is mainly interested in measuring absorbance or transmission over either a range of wavelengths or at specific wavelengths; and does not need to use color vision. The instrument will give the needed information.