domain-fintech

What it does: This skill gives rules for building financial software, like banking, trading, or payment systems, using the Rust programming language. It explains important requirements for money-handling software, such as never using regular decimal numbers for money because they can lose tiny amounts of precision, keeping a permanent unchangeable record of every transaction for audits, and making sure money never appears or disappears by mistake. It includes example code showing how to safely represent an amount of money tied to a currency. When to use it: - Building or reviewing code that handles money, transactions, or account balances - Designing a ledger, payment system, or trading platform - Making sure financial calculations are precise and traceable for compliance reasons - Choosing the right tools and coding patterns for currency math and record-keeping This is background guidance used automatically when financial software is being built, not a tool a person runs directly.