Chaos and Order https://www.youngju.dev/blog 천천히 올바르게. AI Researcher & DevOps Engineer Youngju's tech blog. GPU/CUDA, LLM, MLOps, Kubernetes AI workloads, distributed training, and data engineering. ko fjvbn2003@gmail.com (Youngju Kim) fjvbn2003@gmail.com (Youngju Kim) Sat, 13 Jun 2026 00:00:00 GMT https://www.youngju.dev/blog/finance/2026-06-13-deposit-interest-calculation-engine.en Designing a Deposit Interest Calculation Engine — From Day-Count Math to Preferential Rates https://www.youngju.dev/blog/finance/2026-06-13-deposit-interest-calculation-engine.en A practitioner-oriented design of a deposit interest calculation engine. We cover day-count conventions and their traps, simple and compound interest implementations, a preferential rate rule engine, withholding tax, rate history management, and rounding policy with BigDecimal. Sat, 13 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) interestcore-bankingdepositbigdecimalbankingfinance https://www.youngju.dev/blog/finance/2026-06-13-deposit-interest-calculation-engine.ja 預金利息計算エンジンの設計 — 日割り計算から優遇金利まで https://www.youngju.dev/blog/finance/2026-06-13-deposit-interest-calculation-engine.ja 預金利息計算エンジンを実務の視点で設計します。日割り計算と日数慣行の罠、単利・複利の実装、優遇金利ルールエンジン、利子所得税の源泉徴収、金利履歴の管理、丸め方針とBigDecimalまで、落とし穴を中心に整理しました。 Sat, 13 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) interestcore-bankingdepositbigdecimalbankingfinance https://www.youngju.dev/blog/finance/2026-06-13-deposit-interest-calculation-engine 예금 이자 계산 엔진 설계 — 일할 계산부터 우대금리까지 https://www.youngju.dev/blog/finance/2026-06-13-deposit-interest-calculation-engine 예금 이자 계산 엔진을 실무 관점에서 설계합니다. 일할 계산과 일수 관행, 단리/복리 구현, 우대금리 룰 엔진, 이자소득세 원천징수, 금리 이력 관리, 반올림 정책과 BigDecimal까지 함정 중심으로 정리했습니다. Sat, 13 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) interestcore-bankingdepositbigdecimalbankingfinance