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How to Write an Effective Software Design Document
Michael Lynch outlines a rubric for when to write a design doc, emphasizing that they are only necessary when the cost of being wrong is high.
What: Former Google and Microsoft engineer Michael Lynch provides a framework for effective technical documentation, stressing that docs should focus on high-stakes architectural decisions and clearly outline risks, alternatives, and SLOs.
Why it matters: The rise of complex, distributed microservices makes clear design documentation critical to prevent organizational drift and architectural debt.
Takeaway: If your project involves cross-team collaboration, will take over three months to build, or will live for years, write a design doc; otherwise, the effort may not be justified.
Decoder
- SLO (Service Level Objective): A measurable performance target, such as 99.9% uptime or <200ms latency, used to define system success.
- RISC-V: An open standard instruction set architecture (ISA) based on established reduced instruction set computer (RISC) principles.
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