You should possess strong programming skills in languages like Python, R, or Java, along with a deep understanding of machine learning concepts and algorithms. They should be proficient in using machine learning libraries such as TensorFlow, PyTorch, scikit-learn, or Keras. Solid knowledge of data preprocessing, feature selection, and model evaluation techniques is essential. Familiarity with big data technologies (e.g., Spark, Hadoop) and cloud platforms (e.g., AWS, GCP, Azure) can be beneficial. Strong problem-solving abilities, attention to detail, and effective communication skills are also crucial for success in this role.