Pretty much every business system ultimately gets translated into a general ledger. So for any system with a finance aspect, we build the ledger in from day zero rather than reverse-engineering one later out of a table of transactions.

Double-entry runs against common wisdom in computer science. Accounting learned its importance the hard way.

Redundancy that a database designer would call duplication is, in accounting, the mechanism that makes error detectable. It has survived five centuries of adversarial pressure. We take that seriously.

• GL from day zero
• Double entry
• Multi-entity
• Period controls
• Traceable reversals

Audit logs, the assets a platform creates, and the documents it emits: PDF, Word, Excel. The document workflow matters more now than it ever has, because documents are the artefacts that leave the system and end up in front of regulators, courts, boards and clients.

Ingest documents. Produce documents. Provide documents. Each of those is a first-class capability with its own provenance, not a reporting afterthought bolted on at the end.

• Ingest
• Produce
• Provide
• PDF / Word / Excel
• Provenance retained

Black box software is no longer acceptable. You need to be able to present exactly how a system works, and then explain it simply, to somebody who does not write software but is accountable for the outcome.

If it cannot be explained plainly, it cannot be signed off honestly.

This constrains design in useful ways. Architectures that resist explanation tend to be the ones that also resist verification.

• Explainable by design
• Decisions recorded
• Plain-language walkthroughs
• Open to inspection

Producing and validating high-quality tests used to be cost-prohibitive for small teams. That constraint is gone. Agents write, maintain and extend unit, integration and end-to-end suites continuously, at a depth and cadence that was simply unavailable a few years ago.

It used to be expensive to test properly. Now you’d be crazy not to.

The point is not volume of tests. It is that verification stops being the thing you trade away under deadline pressure.

• Agent-authored suites
• Unit / integration / E2E
• Continuous execution
• Artifacts retained