Most of these might be obvious, but here are my 2 cents, 1. The interviewer not responding after the initial call => Could be a number of reasons like waiting

Most of these might be obvious, but here are my 2 cents, 1. The interviewer not responding after the initial call => Could be a number of reasons like waiting for other candidates so that they have a larger pool to pick from or not being able to find the time to send out a response or the general policy the company or hiring team maintains. This is not normal, most companies respond with an email of rejection even if it has a generic response. 2. The initial interview is usually a basic screening where they are looking for keywords that match what you can do or your attitude towards work or how you function as part of a team w.r.t. how their existing employees function. A good way to approach this would be to read up on the company values either via it's their home page or reviews on Glassdoor. It will give you a good impression of how to present yourself. Check their tech stack and format your initial `Tell me about yourself` to include and highlight those skills. Also have questions you can ask about how their team functions as it gives the idea that you are interested in working with them.