Accounting software

Accounting software, built by someone who's done it before.

Enterprise-grade accounting experience — delivered at AI-accelerated pace. For accounting firms, bookkeepers and accounting SaaS businesses.

Why accounting is different

The numbers have to reconcile. Every time. Forever.

Accounting software is quietly one of the most demanding categories in all of B2B software. Rounding errors compound, audit trails are non-negotiable, and the difference between a working ledger and a broken one is usually invisible until year-end close goes sideways at 2am.

Since 2021 I've been building deal-management and accounting software for Universal Music Group — a platform processing over a billion transactions a month, where accounting errors ripple out to hundreds of artists, distributors and licensing partners. That background informs how I approach every accounting-software project: double-entry correctness first, speed second, polish third.

What I build

Accounting projects I'm well-suited for.

Accounting SaaS platforms

Customer-facing accounting and bookkeeping platforms — multi-tenant, multi-currency, built around a proper double-entry ledger rather than a glorified spreadsheet.

Internal accounting tooling for firms

Custom practice-management, client-portal and workflow tools for accounting firms and bookkeepers who have outgrown generic cloud accounting suites.

AI workflows for accounting firms

Document review, transaction categorisation assistance, client-email triage — AI applied pragmatically, with the human-in-the-loop checkpoints accountants actually need.

Integrations & migrations

Xero, QuickBooks, Intuit, Sage, and bespoke ERPs. Most accounting software projects live or die on integrations — I scope and deliver them explicitly.

Credentials

Experience that maps directly.

Universal Music Group since 2021 — accounting platform processing 1 billion+ transactions a month
10+ years in fintech, previously security cleared — product end clients included Credit Suisse, JP Morgan and UK government agencies
Founded and exited a SaaS platform handling $100,000+/month in real customer transactions (Smoothbook)
AI workflow design with human review and requirements defined with your accounting specialists
USD pricing, Mon–Fri US business-hours coverage

See also my experience in fintech and legal tech, or browse services: SaaS development, AI consulting.

Common questions

Frequently asked.

Have you actually built accounting software before?

Yes. Since 2021 I have worked on the deal-management and accounting platform for Universal Music Group — a system processing over a billion transactions a month — with the team at Ingrooves (now Virgin Music Group). Before that, over ten years in fintech, working on a product whose end clients included Credit Suisse and JP Morgan. Accounting at that scale is not a beginner project.

Can you work with our firm's existing tech stack?

Yes. Most accounting-software projects need to coexist with Xero, QuickBooks, Sage, Intuit or a bespoke ERP. I scope integrations explicitly up front rather than treating them as afterthought plumbing.

How should an accounting firm think about AI?

AI is excellent for document review, data extraction and triage — and clearly unsuitable for unsupervised tax or audit decisions. The practical question is where to insert human review. I help firms draw that line in a defensible way.

Do you work with single-firm projects or only SaaS businesses?

Both. I work with accounting SaaS companies building multi-tenant products, and with individual firms building internal platforms tailored to how their practice works.

Building accounting software that has to be right?

A short email outlining the project is the fastest way to get a scope and price.

james@yellowmelon.coBook a call

Working with teams across the US, Canada, UK and Europe