Usefulness first
Every feature answers a real shopkeeper need. No gimmicks, no needless complexity.
A tool built for shopkeepers, out of a passion for software done right
JGJPayStock was born from a simple observation: too many shopkeepers spend their evenings recounting what they sold, fixing VAT errors or trying to work out what they really earn. Our mission is to put an end to that: inventory, checkout, invoices, purchasing, suppliers and accounting brought together in one clear, reliable app.
Our mission
Simplify management, free the shopkeeper
Too many shopkeepers end their day with a stock notebook, a checkout app, an invoice spreadsheet and no clear idea of what they earn. These tools don't talk to each other: errors, stockouts, wrong VAT and wasted hours.
JGJPayStock connects everything. What you sell updates the stock, generates the invoice, feeds the reports and adjusts your margin. What you buy raises the stock and captures deductible VAT. And the month's income statement, VAT and cash flow are one click away, with no recalculation needed.
- Everything connected : sales, inventory, invoices, purchasing and accounting share the same data.
- Accurate figures : every figure is computed server-side, to the cent, with no human error.
- Protected data : your information is isolated, secured and exportable at any time.
Our values
What guides every decision
Security by design
Data protection is not bolted on afterwards: it is built in from the design stage.
Software quality
A clean, proven architecture, for a stable product that evolves without breaking.
The founder
Jordan Guimfack Jeuna
An application developer, Jordan designed JGJPayStock with a demand for quality and constant care for the end user.
The app rests on engineering foundations: an identical experience on every device, and a microservices backend (authentication, inventory, sales, accounting) for security, reliability and scalability.
Under the hood
Modern, proven technology
Engineering choices serving performance, security and durability: multi-tenant architecture, role-based access control (RBAC) and exact monetary calculations.
Multi-platform
A single application on Android, iOS, Windows, macOS, Linux and the Web, from one codebase. Localised interface (fr / en / de) and dark mode, consistent everywhere.
Microservices architecture
Authentication, inventory and sales: independent services, one database per service, deployed and isolated separately. Loose coupling, scaling service by service.
Watertight multi-tenant
Strict isolation by company identifier injected from the authentication token, never from the request (anti-IDOR protection). Your data never crosses that of another customer.
Asynchronous & real-time
Stock alerts, in-app notifications and emails handled by background task queues : the checkout never waits.
Exact accounting (DECIMAL)
Profit, VAT collected / deductible / due, cash flow, COGS, margin and weighted average cost (WAC) in DECIMAL : accurate to the cent, never floating point.
Security by design
RBAC (permissions verified server-side), authentication via a secure token, parameterised queries (anti-SQL-injection), audit log immutable, hash-chained. Security is in the architecture, not an option.
Scaling
Statistics pre-aggregated (O(days) reads), pagination keyset and dedicated indexes: 1.5 million sales aggregated in under 120 ms (measured). Designed for decades of history.
Time & timezone under control
Timestamps stored in UTC, rendered in the company's timezone (IANA database, daylight saving handled). "Today" reports never lie, wherever you are in the world.
Clean REST API
API contracts in REST clear and versioned, validated by strict schemas, with consistent error handling. A healthy basis to integrate and evolve the product.