ISTJs thrive in an environment centered around routine and rules. Because of this, they may be likely to seek out careers that allow them to enforce these rules. ISTJs often work in law or government.
In addition, ISTJs are often good at a variety of things because they believe they can achieve anything they set their minds to. ISTJs are often well-suited for careers as military personnel, managers, police officers, judges, teachers, accountants, detectives, doctors, dentists, and financial officers.