In simple words, it asking what you have done in your previous job?Try to cover the below points while giving answer to this question:-
Finally your achievement’s in the project and to the company if any.
dont give one line answer . describe something details like about your position details, work details and your contribution to the project etc
At my last job, I was a research assistant. I helped the supervisor with her daily tasks, and was in charge of responding to queries by study participants. I also helped her with any of her research tasks, such as writing research papers and creating posters.
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Developer
My Responsiblity Includes Anylising the requirment,Coding making sql tables related to that and testing. Other that that also help and trained my juinors