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Engineering
Technical notes on how critical systems fail, how they are built to last, and what changes when a decision depends on them.
Publications
In order of publication.
Engineering for Decisions That Cannot Fail
What changes in the design when being wrong costs more than a retry: reversibility, an explicit envelope, who answers for the decision, and the channel through which the error is found.
Architecture Is an Operational Decision
Architectural choices are choices about who gets woken at three in the morning and about what can be changed under pressure: coupling, failure boundary and cost of change, read for what they are.
Modernising Critical Software Without Losing Operational Control
Modernisation fails when it trades a known system for a newer unknown one. Incremental strangling, observable parity and reversibility at every step are what preserve control during the crossing.
Why Critical Systems Fail Before the Incident
The technical failure is the last event in a chain that began as an organisational choice: four mechanisms that produce incidents long before any alarm goes off.
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