Gaps in employment have always been a red flag for hiring departments. While there are many, often very valid reasons for employment gaps, they still can still hurt your chances at getting a callback.
Those that do get a callback are left with the choice of either explaining the gap and possibly revealing information that would otherwise be protected during the interview process, or not offering any detail and raising the flag even higher.
In a 2019, one of the best resume services conducted a resume study that found applicants have a 45% lower callback rate if they have gaps in employment on their resume.
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