Hey,
The answer is a big 'NO'.
You can't get the job of a 'Civil Engineer' without compteting Civil Engineering.Thouh companies come to college to hire students in their final years yet you become eligible to work only after the completion of your course.To be eligible to work in several fields you need to meet certain eligibility criteria.
I mean you just can't treat on patients without even having a MBBS degree.So your question does not seem logical at all. I mean it is only possible in case of politicians or actors or businessman where you don't need to have Bachelors degree of the same field.As cliched as it may sound but to be able to work in Mainstream you need to study and score passing marks( most preferably good marks) and obtain a 'Degree'.
Even if you want to switch to a completely new field then you need to have atleast a Bachelors degree or Diploma degree then only you would be eligible to work in government sectors or private sectors.
Doesn't matter how talented you are,you got to have a degree to prove your worth in this field.A harsh reality though!
Good luck.