die Expertin
expert
A female person who has extensive knowledge and great skills in a particular field.
Für die Analyse der Daten haben wir eine externe Expertin hinzugezogen.
For the analysis of the data, we brought in an external expert.

expert
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expert
A female person who has extensive knowledge and great skills in a particular field.
Für die Analyse der Daten haben wir eine externe Expertin hinzugezogen.
For the analysis of the data, we brought in an external expert.

The word 'Expertin' (female expert) is formed by adding the typically feminine ending '-in' to the masculine form 'der Experte' (the male expert). This pattern is used for many German job titles and terms for people.
Der Lehrer wurde krank, also unterrichtete heute eine Lehrerin.
The male teacher got sick, so a female teacher taught today.
To specify an expert's field, you usually use the preposition 'für' (for) with the accusative or the expression 'auf dem Gebiet' (in the field) with the genitive.
Sie ist eine gefragte Expertin für künstliche Intelligenz.
She is a sought-after expert in artificial intelligence.
Common verbs used with 'Expertin' (female expert) are 'eine Expertin hinzuziehen' (to bring in an expert), 'eine Expertin befragen' (to consult/ask an expert), or 'als Expertin gelten' (to be considered an expert).
Für die technische Prüfung müssen wir eine externe Expertin hinzuziehen.
For the technical inspection, we need to bring in an external expert.
champion / master
'die Expertin' and 'die Meisterin' can both refer to a woman who is very good at something. 'Expertin' mainly emphasizes knowledge and experience in a particular field. The word fits well in professional, academic, or advisory contexts. 'Meisterin' more strongly emphasizes that someone has an especially confident and often impressive command of a skill. It can also sound more figurative. Learners may confuse the words because both express competence. As a practical rule: when it is about specialist knowledge, 'Expertin' is usually more precise. When it is about exceptional ability, 'Meisterin' often fits better.

Nach dem Gespräch fragte ich die Expertin noch nach den Risiken.
After the conversation, I asked the expert about the risks as well.
Nina ist eine Meisterin darin, schwierige Themen einfach zu erklären.
Nina is a master at explaining difficult topics in a simple way.