2. DigitalOcean

For each referral candidate who is hired, the referring employee received a $3,500 referral bonus in addition to a $1,500 charitable donation paid by Digitalocean on the employee’s behalf. 40% of Digitalocean’s new hires have been acquired through referrals.

Lessons:

Structure your employee referral bonuses to serve a good cause.
Instead of offering a cash prize, offer to make a donation to your employee’s favourite support a charitable organization.