Whether through formally structured positions or casual volunteer opportunities, the quality of your work is noteworthy enough that someone acknowledges its contribution before being prompted by an application. This could help paint an all-encompassing outline of who you are as an employee and person living outside the workplace.
It's then important to think carefully about who you ask for this type of recommendation and foster these connections over time for future opportunities requiring professional references. Ensure they are familiar with your achievements and traits required for success in any given role at whatever level; if they are capable, these references may be used repeatedly in similar positions.
As such, after a successful interview, employers typically contact former or current supervisor(s) to gain some insight into who you are both professionally and as an individual. This can provide them with invaluable information that goes beyond what is discussed in your resume or even during the interview process.
More info: Guide to Writing a Job Acceptance Letter
