Be a Host is the Airbnb core value that turns the product's central metaphor inward: hosts anticipate needs, care for people they've just met, and take responsibility for someone else's experience. Applied to how employees work, it means engineering generosity - noticing who is struggling and helping before being asked, making newcomers productive fast, treating partner teams and interviewees and support agents as guests whose experience you own, and caring about the people affected by your decisions, not just the decisions. Airbnb probes this value directly in its core-values interviews, and it is harder to fake than it sounds: hosting behavior leaves receipts - onboarding docs you wrote, rotations you set up, credit you redirected, the incident where you covered for a teammate without being asked - and interviewers ask for them. The bar is higher than being nice. Niceness is a demeanor; hosting is an active practice with outcomes: ramp time reduced, a struggling teammate retained and thriving, a hostile cross-team relationship turned collaborative, an interview process candidates praise even when rejected. Interviewers listen for anticipation (you noticed the need before it was voiced), ownership of others' experience (you treated their confusion as your defect), and durability (you built the mechanism, not just performed the kindness once). The anti-signals: candidates whose helpfulness is entirely reactive, who describe mentorship with no evidence the mentee got better, whose 'collaboration' stories are actually stories about being agreeable, or who have clearly never considered that a code review, an on-call handoff, or a postmortem has a guest on the other end of it.