In English, we generally use “a” or “an” before job titles when talking about someone’s profession in a general sense.

  • Correct: She is a project manager.
  • Incorrect: She is project manager.
    (The article “a” is missing, which makes the sentence sound incomplete.)

Tip:
The article “a” is used with consonant sounds, and “an” is used with vowel sounds (like an engineer).