Vibe Coding in Practice: How We Built a 26-Week Cash Flow App That Beats Xero’s Own

Every business owner knows the quiet dread of not knowing what next month looks like. Profit is one thing; cash in the bank is quite another. And when the two disagree, cash decides whether the wages get paid. That is precisely the problem we set out to solve using VIBE Coding — building a bespoke 26-week cash flow tool that outperforms what Xero offers out of the box.

Recently we set out to solve exactly that problem for a client. Our bespoke AI software service delivered a cash flow management webapp that connects directly to their Xero account. It gives them a clear, rolling view of their finances up to 26 weeks into the future. It comfortably exceeds what Xero’s own cash flow tools can offer.

What made it possible — and fast — was a modern approach to development often described as vibe coding. In this article we’ll explain what that means. We’ll also cover why it changes the economics of building custom software, and how it delivered a genuinely powerful tool for a real business.

What is vibe coding, really?

Vibe coding means building software in close collaboration with AI. Rather than typing out every line by hand, a developer describes intent — the feature, the behaviour, the edge case. They then work iteratively with an AI assistant to shape and refine the code.

It’s easy to misunderstand the phrase. Vibe coding is not about switching off your brain and hoping for the best. The developer is still the architect, the reviewer, and the person accountable for what ships. The AI is a very capable, very fast pair of hands.

Done well, VIBE Coding collapses the distance between an idea and a working prototype. Work that once took days of boilerplate and documentation-hunting can now happen in an afternoon. That frees the developer to focus on what actually matters: design decisions, data integrity, security, and the details that make a product feel considered.

Why VIBE Coding changes the maths for small businesses

Bespoke software has traditionally been expensive, and for good reason — it takes skilled time. That cost pushed custom tools out of reach for many smaller firms. They faced a choice between generic off-the-shelf products or awkward spreadsheets. VIBE Coding is beginning to change that reality.

AI-assisted development shifts that balance. Routine work speeds up. More of the budget goes toward real value rather than plumbing. Through VIBE Coding, a small business can now commission a tool built around how it actually operates — not how a software vendor imagines an average company works.

The problem: cash flow visibility beyond the basics

Xero is excellent accounting software, and its built-in cash flow feature is a useful starting point. But like any general-purpose tool, Xero targets the widest possible audience. That means it stops short of what many businesses actually need.

Our client needed to see further ahead and in more detail. They wanted to model scenarios, account for known future commitments, and understand not just where cash stood today but where it would stand across a full two quarters — with enough granularity to act early rather than react late.

Standard tooling simply didn’t stretch that far. The gap between what the software could show and what the business needed to know was exactly where the risk sat.

What a purpose-built cash flow tool can do that Xero cannot

Xero’s cash flow forecasting works from your existing invoices and bills. That gives you a reasonable snapshot, but it only reflects what the system already knows. It cannot account for recurring patterns your accountant holds in their head. It misses irregular seasonal income, committed spend not yet invoiced, or the payment habits of individual clients. A purpose-built tool can encode all of that — because the developer builds it in direct conversation with the people who actually run the business.

For our client, that meant modelling a series of variables that Xero simply has no field for. Certain customers reliably pay thirty days late. Certain costs cluster at the end of each quarter. Staff hours flex with project load. None of that appears in a standard ledger view, yet all of it shapes real cash position. Vibe coding let us move quickly through the logic for each rule, refining edge cases in hours rather than days, and surfacing a genuinely accurate 26-week horizon rather than a best-guess straight line.

The interface reflects the way the client thinks about their money. Instead of navigating accounting screens built for compliance, they see a single rolling chart with three scenario toggles: best case, expected, and cautious. Colour coding flags the weeks that need attention. The chart updates automatically each time Xero syncs. Custom AI data analysis like this turns raw financial data into a decision-making instrument rather than a record-keeping exercise.

The broader point is simple: software built around a specific business will always outperform software built around a category of businesses. The economics of bespoke development have shifted considerably. What once required a lengthy, costly engagement can now reach a working, deployable state in a fraction of the time. There are no corners cut on security, data handling, or reliability. If you have quietly settled for a tool that almost fits, that shift is worth paying attention to.

Taking VIBE Coding further in your business

The cash flow app is one example, but the same approach applies across many business functions. Stock planning, project margin tracking, staff scheduling — any process that relies on your own rules and rhythms is a candidate.

VIBE Coding makes it practical to build tools that fit your workflow exactly, without the lengthy briefs and long development cycles that once made bespoke software a luxury. Smaller teams can now move from problem to working solution in days.

If you have a process that spreadsheets no longer serve well, book a discovery call and we can explore what a purpose-built tool might look like for you.