MongoDB's internship program has been a significant factor in the company's growth, with over 30% of its U.S. engineers coming from the program. The program began in 2011 and has since expanded to multiple continents and new business units. Over the past decade, MongoDB has made a concerted effort to improve and refine the program, resulting in increased success for interns and New Grads. Many former interns have gone on to become leaders within the company, with some even returning after leaving and joining again. The program's focus on providing interesting challenges and a supportive culture has been key to its success, with many interns citing the opportunity to work on meaningful projects and learn from experienced mentors as major contributors to their growth and development.