No, it is not possible to be both an ENTJ and an ISTP simultaneously. The Myers-Briggs Type Indicator (MBTI) assigns individuals to one of the 16 distinct personality types, and each type is defined by specific combinations of preferences in four key dimensions: Extraversion (E) or Introversion (I), Sensing (S) or Intuition (N), Thinking (T) or Feeling (F), and Judging (J) or Perceiving (P).
The combinations you mentioned, ENTJ and ISTP, have conflicting preferences in three of the four dimensions:
Extraversion (E) vs. Introversion (I): ENTJs are Extraverts, who are energized by interacting with others and tend to focus on the external world, while ISTPs are Introverts, who gain energy from solitude and introspection and often prefer to focus on their internal world.
Sensing (S) vs. Intuition (N): ENTJs are Intuitive, relying on patterns and possibilities beyond the immediate data, whereas ISTPs are Sensing, paying attention to concrete details and facts in their environment.
Thinking (T) vs. Feeling (F): ENTJs are Thinkers, who make decisions based on objective analysis and logic, while ISTPs are also Thinkers, using rationality and logic to reach conclusions.
Judging (J) vs. Perceiving (P): ENTJs are Judging types, preferring structure and organization, while ISTPs are Perceiving types, being more adaptable and spontaneous.
Since ENTJ and ISTP have opposing preferences in three of the four dimensions, it is not possible to be both types at the same time. However, individuals can experience different facets of their personality in different situations or at different stages of their lives, which can lead to some degree of variation in their behavior. Nevertheless, when identifying an MBTI type, it's important to consider the overall pattern of preferences that is most consistent and characteristic for the individual.