15Five
15Five is an AI-powered performance management platform used by over 3,500 companies — including HubSpot, Credit Karma, Pendo, Spotify, and Peloton — to run performance reviews, engagement surveys, OKRs, continuous check-ins, and manager coaching. Founded in 2011 by David Hassell around the idea of a weekly 15-minute-to-write, 5-minute-to-read employee report, the company has evolved into a full HR platform centered on the "Best-Self Management" philosophy and the "HR Outcomes Flywheel." Interviews at 15Five are deeply values-driven and mission-aligned: candidates are evaluated on human-centered leadership fit, cross-functional collaboration, and authentic communication, so preparation needs to go well beyond résumé review to include genuine fluency in 15Five's product philosophy and operating beliefs.