You would need a broad range of knowledge in various fields. See the below listings.
Technical Skills: Algorithm in a Procedural Programming Language, Advance SQL, Understanding of large datasets by software systems.
Math Skills: Statistics, probability, and combinatorics.
Analysis reasoning skills: An ability to make an investigative path, ability to frame problems, and coherent understanding which leads to answers.
Knowledge about the product: An approach to the product in terms of business, user-interaction objectives. One’s ability to determine the success of the product.
Communication skills: One’s ability to communicate in an organized and structured way. You should be able to express your abilities clearly.
Interested in Data Science? Check out this Data Science Course by Intellipaat.