It really depends on what kind of engineering job you are looking for...there are jobs which might require specific knowledge of either CAD, CAE or other experience with specific modules or labs, which you won't be able to have with a maths degree. There are other jobs, which might be more mathematically demanding, where you might fit in, but you have to be more specific and check the requirements for every job and company you are interested in.
A relevant MSc is always a plus...