Why the practice exists
Retention discussions often begin with a familiar chart and end with several incompatible explanations. Engine Nodecore was formed to slow that moment down: define the user and return event, check whether measurement stayed stable, and make comparisons that survive scrutiny.
The name reflects the two levels we work across. “Engine” is the sequence of product experiences that creates repeat value. “Nodecore” is the dependable unit underneath the analysis: a user, account or device whose behaviour can be interpreted without quietly changing identity halfway through.
The people
The practice is led by Mara Ellison, an analytics consultant who has worked with consumer subscription, marketplace and B2B product teams in the UK. Her focus is behavioural measurement: event taxonomy, identity resolution, cohort design, experiments and communicating uncertainty to mixed technical and commercial groups.
For warehouse-specific engineering or specialist statistical review, we bring in named associates only after discussing the need and access with the client. Work is never passed to an anonymous delivery pool.
How we work
We begin with the decision, not a tour of every available metric. Analysis notes distinguish definitions, observations, interpretations and recommendations. When evidence is weak, we say what would strengthen it. When the real obstacle is broken instrumentation, we do not disguise repair work as a strategic insight.
Our office is in Bishopsgate, with most analysis delivered remotely and workshops available in London. Bring us a retention question.