Cracking the Coding Interview, Elements of Programming Interview, Leetcode, Hackerrank.. the normal gambit of data structures & algorithms review. Be prepared to answer any questions on your resume including questions on your past internships, personal projects, and classes. I would research the company and be prepared to answer "why Summitsync?" Go over basic data science / data engineering topics, brush up on Python (numpy, pandas, etc.), and review probability/ stats/ discrete math.