Joel Califa led Product Design at DigitalOcean, and recently joined the Developer Workflows team at Github. He recently updated his website, which is a quintessential example of how to make an impressive portfolio.
Joel's site is full of personality, featuring numerous easter eggs, an opinionated design that isn't bland nor overly complex, and a personable writing style that makes you want to read more. So many designers go for "flashy" designs over substance, but Joel's portfolio is proof that you achieve both. Here are some shots of the site, but I encourage you to click-through and take a look for yourself.
I didn't know this until I went through his portfolio, but Joel is also the author of one of my favorite Alfred plugins, The Alfred Emoji Pack. If you use Slack commands to write emojis, you'll want to check this out as well.