A covering letter can be a good way to get yourself noticed during the job search. Jobs are highly competitive, especially in certain fields, and you will need to make sure you have something that makes you stand out. Use lots of buzzwords that will match up with the required skills for the jobs and make sure you fully outline how your experience matches the criteria for the position.
A cover letter is your chance to show that you are very interested in a position. Don’t just make it technical – let your personality show through as well. A recruiter or hiring manager will want to know whether you are going to fit into a team, so make sure they understand who you are and what you are about. Tell them about why you want the job, how you feel they can benefit from your experience and why you are an outstanding candidate.