Once you join a company, whether you want to or not, you have to work for the company.
Literal
Company [target-に] enter [conditional-と], self [subject-が] wish [and-と] wish-not [and-と] regardless [of-に-かかわらず], company [for-のために] work-must.
A meditation on work life using a classical/literary construction. 望むと望まざるとにかかわらず ('whether [one] wishes or not') stacks the classical negative 望まざる (modern: 望まない) with the contrast-neutralizing ~にかかわらず. Reads as formal and slightly resigned. The subtext: work becomes a duty regardless of personal feeling once you're an employee.