Candidate Search: Design a System to Search and Rank Job Candidates at Scale

Round 1 - System Design Problem Design a candidate search system for a recruiting platform with 50M candidate profiles. Recruiters filter by: location (radius), years of experience, skills (multi-select), job title (free text), and salary expectation. Results must be ranked by relevance and returned in < 300ms at p99. Scale: 50M profiles, updated in near-real-time as candidates edit them 10K concurrent recruiter searches Profiles update at ~100K/hour Follow-ups How do you handle the geo-radius f…