Rippling System Design interview questions often focus on the intersection of HR, IT and finance: payroll engines, identity and provisioning, multi-tenant data models, third‑party integrations, and real‑time compliance. What’s distinctive is the platform nature of Rippling — interviewers expect you to reason about tenant isolation, accurate financial ledgers, secure PII handling, idempotent external integrations, and trade‑offs between strict consistency and operational availability. Expect open‑ended prompts that push you to define requirements, sketch high‑level architecture, choose data stores, and justify latency, cost, and reliability decisions while calling out operational concerns like monitoring, disaster recovery, and auditability. For interview preparation, practice structured problem‑solving: clarify constraints, estimate scale, propose a layered design, and iterate on bottlenecks with concrete trade‑offs. Drill common SaaS patterns (sharding, queues, caching, event streams, idempotency), rehearse designing payroll/identity/API systems, and do whiteboard or diagram practice to communicate clearly. Finally, rehearse answering follow‑ups about security, compliance, testing, and failure modes — those details are often the difference between a good and a great answer.