This section should be placed at the very beginning of your CV. It should contain two to three sentences which describe what sets you apart from other candidates for the position. You can read more about how to write a summary here: Summary - key but often forgotten part of a CV.
You may have heard the recommendation to exclude information about your hobbies or other personal traits and activities from your CV. However, this is true only to a certain extent. If the information is related to the job you are applying for or the company culture, include it. Mention, for example, your volunteer activities or memberships in various organizations.
Add a few points to each of your previous jobs that you mention in your CV to emphasize your greatest accomplishments in that role. Be as specific as possible, include numbers, percentages, etc.
Keep in mind that recruiters will screen you on Facebook, LinkedIn or Twitter. They will assess whether you can fit into their corporate culture based on your behavior on social networks. Make their job easier and include links to your social media profiles directly in your CV. You can even briefly mention the topics you usually comment on in each social network.
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Article source Fast Company - leading U.S. magazine and website for managers