Why jinjer Bet 10 Years on a Unified HR Database

Haruaki Mikuriya — PayPay employee #9 — joined jinjer after founding an AI startup, and explains why the unified HR database the company has built over a decade now holds “correct data that no AI can replicate.”

• jinjer: 10 years old, 18,000 customers, 500+ employees, more than half in their 20s
• The single integrated DB was a founding architectural decision — retrofitting it later would be near-impossible
• HR data analytics cut CSV→Excel workflows to 15–30 minutes, with AI analysis available end-to-end in the same product
• Attrition risk is detected from data and actionable suggestions are surfaced — a shift “from genius surgeon to smartwatch”
• CEO quote: “Not doing AI is not an option. The only question is whether we do it, or go all-in.”
• Internal “Customer Zero” project has every employee using jinjer’s own product at full intensity
• HR SaaS market growing 20% annually; jinjer acquired a recruitment management system for talent use cases
• Mikuriya is rolling out Claude Code to non-engineers, embodying “human–AI integration” inside the company

2026-04-26 · Watch on YouTube

Japanese page: jinjerが統合型人事DBに10年賭けた理由