Senior Engineering Is About Designing Failure, Not Just Making Code Work

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A software engineering perspective argues that writing code for the 'happy path' is straightforward, but true senior engineering lies in anticipating and containing failures. The article distinguishes between fault-tolerant 'sovereign bulkhead' systems, where failures are isolated, and fragile systems where a single crash can cascade across services. Examples include circuit breakers, read-replicas, and cached fallbacks that keep core functions like a shopping cart running even when dependent services fail. The piece also cautions that AI coding tools can generate isolated functions but lack awareness of an organization's broader system dependencies and failure blast radius. Engineers are advised to evaluate every critical code path by asking how far damage could spread if that component fails.

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