After initial conversation with HR, I was sent ... a "homework. Four pages of exercises from variety of categories: - SQL - bash scripting - short admin questionnaire - implementing tree-walking algorithm using programming languages, preferably python Be prepare to spend couple of evening on these exercises. Nowhere in the papers they mentioned whether you can or can not assist in materials, google, etc. I choose not to so they can get more authenticate view of scope of my knowledge. In retrospect, Google offers some useful tips.