It is unclear who the executive is, but Eric Schmidt seems to fit the description. At the time, he was Executive Chairman of Alphabet Inc, the parent company of Google, and an unofficial advisor to the Clinton campaign, who founded start-up The Groundwork to serve as a top-tier tech contractor for the campaign.
Alphabet is the parent company of Google, which owns the largest public DNS service in the world. Alphabet also had an ownership stake in Crowdstrike, which provided cybersecurity services to the DNC and took a leading role in investigating alleged Russian cyber-attacks against the DNC as well as the Clinton campaign.
From the article: