JT Vault

JT Vault is the internal business operating system behind JT Digital. It handles everything from transaction tracking and invoice generation to project profitability analysis and VAT compliance — all built as a server-rendered app with zero client-side JavaScript frameworks.

Running a software agency means juggling finances, projects, clients, and compliance across scattered tools. Off-the-shelf accounting software doesn't understand agency economics — profit allocation across multiple accounts, recurring client retainers, or Slovenian VAT (DDV) reporting. We needed a single system that thinks the way an agency founder thinks.

A purpose-built financial platform with a multi-account allocation engine that automatically splits every transaction across Profit, Owner's Compensation, Tax, and Operating Expense accounts. The approval workflow ensures co-founder governance on financial decisions, while the invoicing system generates compliant PDF documents with one click.

The entire UI is server-rendered using fluent-html (our own type-safe HTML library) and HTMX for interactivity — no React, no Vue, no bundle. Every interaction is a simple HTTP round-trip with morphing DOM updates, keeping the codebase lean and the page fast.

• Transaction Management — Track income and expenses with automatic balance allocation across multiple company accounts
• Invoice & Offer Generation — Create, preview, and export professional PDF invoices and client offers
• Project Portfolio — Monitor project lifecycle, contract values, and monthly maintenance revenue
• Approval Workflows — Multi-level approval system for transactions, settings changes, and documents
• VAT Reporting — Slovenian DDV compliance with pass-through tracking and tax period summaries
• Weekly Reports — Team activity reports with AI-powered summaries via Claude API
• Sales Pipeline — Daily activity tracking for emails, inquiries, calls, offers, and closed deals
• Annual Goals — Set quarterly targets and track profit against projections

• Zero-JS architecture — Full interactivity via HTMX morphing swaps, no client-side framework
• Type-safe HTML — fluent-html generates HTML with compile-time validation and fluent Tailwind methods
• Financial domain modeling — Discriminated unions for transaction states, allocation algorithms, and multi-account balance management
• Prisma v7 — Advanced query patterns with typed includes, soft deletes, and complex aggregations
• Activity audit trail — Every financial action is logged for compliance and transparency
• Testability — Integration and unit tests with Vitest, covering services, controllers, and database interactions end-to-end