Core Banking

Prerequisite: Proficiency in database schema design (PostgreSQL), atomic transactions, ACID guarantees, and general ledger chart of accounts. Double-Entry Bookkeeping: Core Banking Ledger Guide Answer-first: The double-entry general ledger forms the immutable mathematical foundation of core banking systems, enforcing the strict financial accounting invariant that total debits must equal total credits across all multi-currency journal postings, preventing financial discrepancies, ledger drift, and fraudulent balance manipulation through append-only database transaction logs and cryptographically verified audit trails. ...

Prerequisite: Knowledge of retail banking financial instruments, compound interest formulas, loan amortization mechanics, and state machine architecture. Core Banking Domain Modeling: CIF, CASA & Lending Guide Answer-first: CASA deposit engines and lending subsystems govern real-time customer account balances, overdraft protection facilities, and automated loan amortization calculations, utilizing high-precision fixed-point decimal arithmetic, daily compound interest accrual algorithms, and deterministic repayment state machines that eliminate floating-point rounding errors and ensure full regulatory compliance with central banking accounting standards reliably. ...

Core Banking Systems Architecture Masterclass Guide Answer-first: Modern cloud-native core banking transitions from batch-driven mainframes to composable distributed platforms: immutable double-entry ledgers enforcing mathematical zero-drift balance invariants, multi-region Distributed SQL guaranteeing serializable ACID transactions, event-sourced CQRS projections, orchestrated compensation Sagas, zero-allocation ISO 20022 streaming, and FAPI 2.0 security. This architecture eliminates end-of-day batch freezes, delivering sub-25ms P99 latency across active-active deployments. Prerequisite: Practical familiarity with distributed systems fundamentals, relational transaction isolation levels (ACID), event-driven microservice patterns, and enterprise networking (mTLS, TCP/IP, gRPC). For foundational context, explore our Banking Microservices Architecture and Go Microservices Guide. ...