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Put the real end month on the job you were laid off from, and learn which date counts when notice, garden leave or severance is involved. Includes snippets for short jobs and gaps.
Find the numbers your work already produced, estimate the rest in a way you can defend in an interview, and write bullets from scope when there is no number at all.
List the company once, stack your titles under it with their own dates, and give each level bullets that show bigger scope. Formats and examples for the awkward cases too.