Job adverts with "proven track record" In some job adverts I found something on the lines of (emphasis mine):


  Requirements:
  
  Graduate degree in X or PhD in Y with a proven track record in X, ideally with experience in Z. We are looking for a highly motivated scientist to join an interactive, multi-national team at the cutting edge of...


(I know I should ask the OP as they are the only ones to know what do they want to say... but,). What does this "proven track record" mean ? 

Does that it mean I should have publications?
Could it be other published work like blogs, programs, discussions, answers in SE traceable back to me if they are related to X?
For an industry position this typically means you have worked on and completed a project that involved X. Ideally you should also have some way of presenting verification of this if challenged, but generally confidentiality agreements may prevent specific details. In the academic sense, this effectively means the same thing, but you should have some sort of publication to verify your involvement in X.