OneFirm

Small businesses facing a big call, like whether a 14-person agency can safely hire two strategists, need the combined work of a finance partner, strategist, auditor and risk adviser. Another dashboard or a generic chat doesn't give them that.

Builder · OpenAI Build Week

• Built a deterministic 12-month cash model comparing current-team, one-hire and two-hire scenarios under growth, collection-timing and client-renewal stress.
• Enforced explicit decision gates (£150k cash floor, £108k MRR, client concentration under 32%) and exposed the full monthly calculation trace.
• Wrote the partner memo and dissent with the OpenAI Responses API and Zod structured outputs, instructed never to invent or recalculate a number.

→One consequential question answered end to end: every figure is traceable, and every assumption can be challenged from the Finance, Strategy, Risk, Audit and Capital views.