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Mark Fasel
WRITING

Thinking, worked out in public.

Essays on software architecture, systems thinking, AI, engineering leadership, and the work of building products. Frameworks I actually use, and opinions I am willing to defend.

Long-form and infrequent. New writing goes out through Designing Modern Systems on Substack; this page is where it is indexed.

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Latest from Designing Modern Systems

Recent posts from the newsletter. Each one opens on Substack, where it is published.

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Essays

Longer pieces written for this site. These live here rather than in the newsletter, and most of them started as a decision on a real system — the ones with a write-up are on Projects.

  • Architecture 1
  • AI 1
  • Leadership 1
  • Systems Thinking 0
Featured

The architect's job is decisions, not diagrams

Every architecture diagram I have ever drawn was a byproduct. The actual work was deciding what we would not build, and writing down why.

Architecture · · 4 min read

  • How to tell if your AI strategy is real

    Most AI strategies are procurement plans wearing a strategy costume. Four questions separate the ones that will compound from the ones that will quietly be cancelled.

    AI
    · 4 min

  • Most scaling problems begin as communication problems

    The system is a cast of the organization that built it. When a platform stops scaling, the constraint is usually an ownership boundary nobody wanted to renegotiate.

    Leadership
    · 4 min

NEWSLETTER

Designing Modern Systems

Essays on architecture, engineering leadership, AI, and building better systems. No promotions, no cadence for its own sake.

If a piece here describes a problem you are actually living with, that is what the consulting work is for.

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