I build the backend other systems run on.

Abror Programming · standalone microservice inside the AERP platform

A CRM service that tracks a customer from first phone call to closed payment. Built as an independent Express 5 / TypeScript microservice: it speaks gRPC to the core ERP for shared organization and employee data, and REST to the Utel IP-telephony system so every call lands against the right client record.

• Ten domain modules — clients, companies, conversations, call conclusions, transactions, payment offices, positions, employees and an activity board that flags clients going cold.
• Eleven-model Prisma schema on PostgreSQL, with organization context enforced on every query so tenants can never read each other's data.
• JWT decrypt middleware, Zod request validation, a global error handler, and a Dockerized deploy running on Bun.

Abror Programming · education module of the AERP platform

The learning-management service of AERP: courses, structured modules, lessons, reading material, exams, and per-student progress. A NestJS 11 application that runs both as an HTTP API and as a gRPC microservice for the rest of the platform.

• Fifteen Prisma models covering courses, modules, lessons, readings, exams, progress, ratings and comments.
• JWT + Passport auth with guards, decorators and interceptors; documented end to end with Swagger.
• Course media uploads through AWS S3 presigned URLs, so large files never pass through the API process.

Independent client work · built and maintained solo

A complete point-of-sale and online-store system for a meat retail business, built alone across two development passes. NestJS/Prisma backend paired with a React 19 admin and cashier interface — the shop runs its daily sales on it.

• Cashier flow with receipt printing through QZ Tray and PDF invoice generation.
• Product images on AWS S3, scheduled jobs for automated database backups, Telegram bot alerts for new orders.
• Live sales and inventory dashboard built with Recharts, so the owner sees the day's numbers without asking anyone.