Get an interview at LinkedIn by solving this puzzle (workatlinkedin.com)

Is that really a legit website affiliated with LinkedIn? Smells fishy:

    $ whois workatlinkedin.com
    (...)
    Creation Date: 2015-12-28T20:13:00.00Z
    Reseller: NAMECHEAP.COM
    (...)
    Registrant Name: WHOISGUARD PROTECTED

    $ dig +short workatlinkedin.com \
    | xargs -L1 whois \
    | grep Organization: \
    | sort -u
    Organization:   CloudFlare, Inc. (CLOUD14)