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Lessons (4)

• Time, Consistency and Distributed Transactions

  Reason about clocks, ordering, split brain, locks, CRDTs and transactions without promising impossible global certainty. ![Distributed correctness: clocks …

• Hexagonal Architecture (Ports & Adapters)

  … Notifier, private readonly clock: Clock, ) {} async borrow(memberId: string, bookId: string): Promise<Loan { if (!(await this.catalog.isAvailable …

• Small Functions That Do One Thing

  … turn the knob on the stove 30 degrees clockwise" . js // ❌ High level and low level mixed together function …

• Clean Architecture in Depth

  … calls to reach the outside world: OrderRepository , PaymentGateway , Clock . The control flow goes outward (use case → database), but …