The coding is the most important skill for Machine learning Engineer. Some of the top data science companies like Fractal Analytics, Google, Facebook, etc. will have a coding test as the first screen round for the Machine learning Engineer position. You can practice for coding test on hackerrank and leetcode to practice coding. Get familiar with these coding platforms is important because you need to pass all the test cases to clear the coding interview. Some companies give a machine learning assignment to screen the applicants. The companies validate you based on your EDA and your approach to solve the problem.
I suggest going through this blog on Machine Learning Interview Questions by Intellipaat that covers frequently asked questions with a better explanation.
You can watch this video on ML interview preparation by Intellipaat to crack the interview for Machine learning:
You can join Intellipaat's Machine learning course to learn a comprehensive certification course in the domain.