The only times I have seen multiple companies with obvious overlapping time periods is under few situations:
- One full time and one part time.
- Multiple part time jobs. I know that many adjunct professors have to work at multiple college/universities at the same time.
- One most of the year (teaching) and the other during holidays. The holiday job could be at a movie theater, amusement park, national park, summer camp...
- One as an employee and the other as a contractor.
These can be easily explained especially if the contractor position is 100% unrelated to the full time employment.
If I noticed that the resume listed what seemed to be two full time jobs, I know that would be a question I would be asking during the interview. I would have concerns about burnout, and if you can focus on the job I am hiring for; but those could be addressed by your explanation. The thing that would concern me the most was potential time-card fraud. How do I know that you won't be doing this in the future? How do I know that you won't be using the hardware I am providing to do work for another company?
Even if you don't mention one of the jobs on the resume, because the resume doesn't have to list all employment, you will have to list all jobs if they want to do a background investigation. Depending on the position they could also do a financial background check which could expose the 2nd paycheck.
Don't manipulate the dates of employment on the resume to try and hide the two year overlap. If they call the companies then the employment dates on the resume won't match what the company ave. This could lead to questions and concerns.
Regarding the resume, I think all options leave you with issues that could invite more questions:
- List both, and they will ask about the double dipping.
- List one, and the other will come out of they do a background check.
- List one, and you could leave a multi-year gap in the resume depending on the order of events.
- Manipulate the dates, invites too many questions if they try and confirm employment history.
The question for you is where in the hiring process do you want this to be noticed/discovered?