Welcome

Not here to sound smart.
Here to make things work.

AI・Tech・Business・Web3・Travel

Latest

PM Product Data and Experimentation 08 － Data Rarely Breaks at the SQL Layer: PMs More Often Fight Identity Issues, Late Events, Bot Traffic, and Failed Rollouts

When PMs see strange numbers, the first instinct is often something like this:

PM Product Data and Experimentation 07 － A/B Testing Is Not Just Hypotheses and P-Values: PMs Need Exposure Rules, SRM, Guardrails, and Validity

A surprising number of experiments do not fail because the idea was weak. They fail for a far more awkward reason.

PM Product Data and Experimentation 06 － Retention, Cohorts, and Segmentation: Knowing Who Stays Matters More Than Watching the Average

A product can look healthier than it really is simply because averages are excellent at cosmetics.

PM Product Data and Experimentation 05 － Window Functions, Sessionisation, and Funnel SQL: Where SQL Starts Becoming a PM Superpower

A lot of PMs learn SQL by learning how to count.

PM Product Data and Experimentation 04 － SQL for PMs: Learn to Pull Evidence Before You Claim to Be Data-Driven

When PMs say they want to become more data-driven, the first instinct is often to ask for more dashboards.

PM Product Data and Experimentation 03 － A Tracking Plan Is Not an Event Checklist: It Is a Data Contract Between PM, Engineering, and Analytics

When teams talk about a tracking plan, they often sound as if they are managing a to-do list.

Explore by topic

Browse the archive by category

A structured path into essays, notes, and observations across the ideas that shape Daniel’s work.

AI OpenClaw PM Startup Business Web3 Travel Murmurs