Becoming an employee of the United States’ most hush-hush intelligence agency isn’t as easy as simply sending in your resume. It takes an immaculate record, a thorough understanding of your field, and an unwavering commitment to national security to even be considered for a position. However, a career with the NSA can be an exciting and richly rewarding experience. If you manage to make it through the rigorous interview process, you’ll receive a formal invitation to serve your country through your contributions to the intelligence community.
Reference:
https://www.wikihow.com/Join-the-NSA