Engineering Insights

How we buildthe systems behind the motor trade.

LatestEngineering InsightsDelivery Assurance

Why an AI-written change waits for CI evidence

A coherent implementation and resolved review comments still aren’t enough. We require independent, attributable CI evidence before a change can advance.

29 September 2026 · 6 min read · James Smith

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Software Factory

Where did the unfinished changes go?

Delivery volume doubled without more repeated repair, yet only 52.2% of started changes were delivered. We’re now measuring where unfinished work stops and how long it stays there.

5 September 2026 · 5 min read · James Smith

Engineering Insights

What our repair cap can prove, and what it can’t

Our bounded repair policy sends changes back to a person after a fixed number of attempts. We’re now aligning records and metric definitions to test whether it really reduces repeated review demand.

28 August 2026 · 5 min read · James Smith

Engineering Insights

Where we draw the line on agent-led repairs

A second repair can carry the same misunderstanding into a wider change. We cap agent-led attempts, then return the work to a person for re-specification.

28 August 2026 · 5 min read · James Smith

Engineering Insights

What it takes to accept an agent-written change

Generating code was easier than proving a change was safe to accept. We set out the controls, evidence and complete delivery trace needed to make that decision auditable.

28 August 2026 · 12 min read · James Smith

Engineering Insights

What a first-pass rate leaves out

We found that first-pass rate and delivered share measure different populations. Without linked lifecycle records, raw counts and clear observation windows, neither can explain end-to-end delivery.

28 August 2026 · 11 min read · James Smith

Engineering Insights

Testing whether cross-family code review finds more defects

Separating implementation and review creates useful disagreement, but it doesn’t prove better defect detection. We set out the evidence needed for a controlled comparison.

28 August 2026 · 5 min read · James Smith

Engineering Insights

What breaks when implementation departs from the approved plan

We found that initial approval wasn’t enough once implementation changed the agreed intent. The lifecycle record must separate plan approval, revision decisions and final acceptance.

28 August 2026 · 8 min read · James Smith

Vehicle Fraud

Designing fraud checks that finish before the sale

A fraud check must return a clear decision before the transaction completes. We look at deadlines, synchronous boundaries and the evidence needed to explain each result.

28 August 2026 · 3 min read · AFT Engineering

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