CIO Playbook
20 posts in CIO Playbook.
Read-only to start · your LLM keys, no lock-in · SOC 2 Type II underway
How Long Does It Take to Build a Data Lake? Three Clocks, and the One That Matters
Hours to land the data. Weeks to a trusted answer. Months to the platform on the slide. Which parts are engineering, which parts are calendar, and how to write the timeline.
The 48-Hour Data Proof: What to Prepare and How to Judge It
Run it before you sign anything. The credentials and questions to prepare, the hour-by-hour, the pass bar that is not five out of five, and what two days cannot tell you.
Where the Nine Months Go: An Audit of a Data Lake Timeline
Thirty to sixty person-days of engineering, spread across 190 elapsed days. The six activities that eat the calendar, what each one costs, and which ones you can cut outright.
Data Lake or Warehouse: You Are Choosing When to Pay the Modeling Cost
Schema on write front-loads twelve weeks of modeling. Schema on read defers it per question. Three questions that settle the choice, and the four-layer pattern that actually gets built.
The 40 Tables That Answer 90% of the Questions
A retail stack exposes 300 to 900 tables. About 40 carry the answers operators ask for. How to find them from twenty questions, what to defer, and the table that always breaks it.
Connectors Are Where the Months Go
Four sources take an hour each and two take three weeks each. Sort them into three classes, request every credential on day one, and stop letting the legacy system gate the project.
You Do Not Have to Move the Data First
Read replicas, external tables, and federated query answer a lot of retail questions without a pipeline. Where in-place works, exactly where it fails, and the hybrid split to run.
The Cost of Delay on a Data Platform, Priced Out
The number missing from every data platform business case is what nine months of not knowing costs. Four decision loops, a worked example at 120 stores, and how to bound the claim.
Rent the Lake, Own the Definitions
Building the layer above storage is six to nine months and two permanent engineers. Renting it is days. The layer-by-layer call, four questions that settle it, and the one thing to never hand over.
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