Building CodeIQ - an AI tool that automates transaction coding for accountants and bookkeepers.

The interesting technical bit: it analyses your historic general ledger to reverse-engineer how you specifically categorise transactions. So instead of generic rules, it learns your firm's actual patterns - "oh, they always code Costa Coffee to Staff Welfare, not Refreshments" - that kind of thing.

Posts directly to Xero, QuickBooks, Sage, and Pandle. The VAT handling turned out to be surprisingly gnarly (UK tax rules are... something).

Been working on it about 6 months now. Still figuring out the right balance between automation confidence and "just flag this for human review".