The answer for this question varies from company to company and it depends on the hierarchy of the company. Your answer should be something like: Sir, initially I would be learning and knowing my work and company. In a year or after 1 year I expect from myself to be an expert in solving the issues on L1 level. And after that I would like to get a certification on the technology I am working. So within 2-3 yrs I expect myself to be a proficient engineer on L2 level.