04 / Fintech & finance
e-Hesab — An AI-based pre-accounting platform
DVX integration, OCR invoices and a dynamic tax engine.
- >95%test coverage on critical logic
- 2AI engines — OCR and Claude
- 0hardcoded tax rates
01 / Overview
e-Hesab is a mobile-first, AI-driven pre-accounting platform for freelancers and small and medium businesses. It is localised to Azerbaijani tax law and the State Tax Service infrastructure, and automates invoices, expense tracking, payroll, DSMF and e-Qaimə processes.
02 / The problem
Freelancers and small businesses often learn their tax obligations at the last moment. Receipts stay on paper, expenses go untracked and filing deadlines are forgotten — and an accountant is too expensive at this scale.
03 / Our approach
Tax calculations are not hardcoded. Simplified tax, VAT, profit tax and payroll deductions run on a configurable dynamic engine, so nobody rewrites code when legislation changes. Paper documents become digital invoices through camera capture, OCR and the Claude API.
04 / The result
Users see their tax calendar, expected payments and potential penalties in advance. e-Qaiməs go straight to the DVX portal, and expenses entered offline sync when the network returns.
05 / Key features
What it does.
- 01
AI invoices and OCR
Photograph a paper receipt and turn it into a digital invoice.
- 02
DVX e-Qaimə integration
Submit declarations and send XML-based e-receipts automatically.
- 03
Dynamic tax engine
Rates are changed through configuration, not code.
- 04
AI virtual accountant
Assigns expenses to ledger accounts and recommends month-end closing steps.
- 05
Smart tax calendar
Tracks deadlines, calculates penalties and sends timely push notifications.
06 / Architecture
How it is built.
Modular monolith
Isolated domains with CQRS and MediatR that could later be split into microservices.
Offline-first
Expenses and invoices are saved locally in SQLite and synced to the central server when connectivity returns.
ASAN Login
Sign-in through ASAN Login with JWT-based authentication.
07 / Technology
Tech stack.
- Backend
- ASP.NET Core 8
- Modular Monolith
- CQRS + MediatR
- Data
- PostgreSQL 16
- Redis 7
- EF Core 8
- Mobile
- React Native (Expo SDK 52+)
- Expo Router
- expo-sqlite
- State
- Zustand
- TanStack Query
- AI and integrations
- Claude API
- Google Vision OCR
- ASAN Login
- QuestPDF
- Quality
- FluentValidation
- xUnit
- FluentAssertions
- Playwright
- SonarQube
08 / Screens
5 screens from the product.
Select a screen to see it full size.
09 / More work
Related projects.
More fintech & finance and neighbouring work from the same studio.
