Ex-Google engineer among those pardoned by Donald Trump

Is a pardon effective? When the person applies for a job or starts a company, and he has to declare all investigations, grand jury indictments, and prosecutions when applying for government contracts, will a pardon eliminate disclosure?

Ongoing discussion: https://news.ycombinator.com/item?id=25843040 ("Anthony Levandowski Pardoned")

Dupe of https://news.ycombinator.com/item?id=25843040