Due to COVID I was employed for only 4 months and have been laid off for 11 months. Accepted an offer today contingent on background check. This 4 month gig was not listed on my resume nor the application. It will show up on the background check. Should I explain to the hiring manager now or wait for the background check. The job is not relevant to this new position nor is it listed on social media (LinkedIn or FB)
1, Well 4 months is not a problem, it happens to I also have 4 months' experience in my profile. Guess what, no any problem!
2, In most of countries, background check only check the companies you input. They don't know the company not show in the CV, or the companies you didn't input.
3, But the point 2) is not always right, for example, in China, any background check companies are able to find your whole working records in Social departments, you don't even has to provide your CV!
Omitting positions is usually not a problem on a CV. The bigger problem is the inverse, i.e. listing jobs that you never had.
There are plenty of jobs I have worked in the past which I no longer mention on my CV simply because they are not relevant to the job I'm applying for.
The job is not relevant to this new position
And since this is also the case for you, then it shouldn't be a problem. If they ask you why you didn't list the job, simply mentioned that you omitted it due to its irrelevance to the position you were applying for.
This 4 month gig was not listed on my resume nor the application.
It doesn't have to be on your resume. You only have to include the jobs that you feel can help you get the job be listing relevant experience, or in the case of jobs that don't relate directly to the new job they show experience that you want to show.
Not including it on the application can be an issue. Many times the application says to list all jobs going back x years. Or they say list your last y jobs. You are supposed to follow the directions.
In some cases the information on the application is what they use for the starting point of the background check. Other times the background check has a separate form.
It will show up on the background check.
It MIGHT show up in the background check.
Should I explain to the hiring manager now or wait for the background check. The job is not relevant to this new position nor is it listed on social media (LinkedIn or FB)
If they find the job you didn't list, the hiring manager might be concerned that you were trying to hide something. Telling them now might avoid that concern. Some people don't list a short job is because they were fired, or they didn't get along with the manager and don't want the new company to contact them.
Contacting the hiring manger might be as quick as a short email, or a quick phone call. That's what I would do.