"Employers are looking for technical business analysts that can link their technical and business teams through solid knowledge on both business intelligence and technology concepts. Amongst the technical questions, emphasize your communication, problem-solving, and relationship-building skills. You may be asked to provide examples of previous data analysis and data mining, as well as how you would handle a situation where not enough information was given, but a recommendation was requested anyways. Be prepared to always reference specific situations to back up your answers."
How do you know when you have enough documentation?
Too much documentation has never been an issue in projects I've worked on in the past. I feel there's enough when, at a glance, new people coming into the project can be caught up quickly. The way I write my stories allows QA to build an easily readable Cucumber test suite that serves as documentation on features, and I let developers create their own documentation on project set up. Other documentation may include mockups and flow charts but are primarily used for estimation and feature building.