FastPay
Interactive tools for a money-coaching service
What it is
A web app that makes a hard topic, mortgages, clear, and shows people the outcome of paying a loan down faster.
This is where I moved from agent design into writing and deploying real coded logic.
The problem
Mortgages are complex and hard to understand. A coaching service in this space has to demonstrate its value and give visual proof of the result, and that is difficult to do with words alone. It needs working numbers a person can trust.
What I built
- A multi-step calculator with real formulas and logic that models the numbers. Real formulas doing the work behind the interface.
- Interactive visual help that turns those estimates into something easy to read.
- An explainer article that walks a reader through estimated and demonstrated outcomes.
- Lead capture and booking behind it, so an interested reader becomes a booked call while the follow-up happens on its own.
How it works
An interactive front end that does the hard maths, with capture and booking wired in behind it.
The hard part, and the lesson
The calculator was the difficult piece. Multi-step formulas and financial logic are the kind of work that normally needs a developer, and getting them right matters when someone is making a decision about their home loan. Building it with Claude let me ship a working, accurate tool in a domain most people find impenetrable.