Insights · Practice notes
Long-form notes on data engineering, decision systems and governance from the team that builds and operates SquareCampus. Frameworks and checklists you can apply with or without Fairhelm; no vendor pitches, no invented case studies.
Topics
·10 min read
Most dashboard disputes are not about the chart. They are about an undefined metric. Five fields that turn a KPI into a contract people can act on, and how to write them before anyone opens a charting tool.
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·10 min read
A dashboard that shows what is wrong but not who owns fixing it is a report. Why exceptions need a named owner, an age and a next step, and how to design the surface so ownership survives staff changes.
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·9 min read
A pipeline is not finished when data lands. It is finished when the people accountable for the numbers can prove they match the source. How to make reconciliation the definition of done.
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·8 min read
Streaming is not a maturity level and batch is not a compromise. A decision framework for picking how data moves, based on latency the decision actually needs, correctness, recovery and what the team can run at 2 a.m.
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·9 min read
Most systems log everything and explain nothing. An audit trail is for a principal, a finance head or an auditor, not for a database. How to design one that answers who, what, when, why and under whose authority, in plain language.
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·7 min read
A small technology company can be a product company or a services company, but pretending to be both usually means being neither. The reasoning behind Fairhelm's scope, what it says no to, and what a selective engineering engagement looks like.
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How to read these notes
Fairhelm Systems is a young company. These notes describe the practice it applies to its own product and to the engineering work it takes on; they cite no customers because none are published. Worked examples are hypothetical and say so.
Frameworks, checklists and decision tests that hold regardless of which tools an organisation runs.
Every note has a Markdown alternate and is listed in fairhelmsystems.com/llms.txt, so agents read the same text a person does.
Company facts derive from one canonical record. Nothing unverified is published, here or anywhere on the site.
Each note ends with what to do next: a checklist, a test, or a question to put to a vendor in writing.
Next move
Bring the concrete version of it. Scope and success measure are agreed in writing before work begins.
