Berkay Derin

Portal Manager

• •Migrated 15-year-old .NET legacy system to modern Next.js architecture
• •Built 11 modules (Order, Stock, Invoice, Production, Customer, Transfer, Expense, Inventory, Report, Warehouse) with feature-based architecture
• •Implemented real-time data sync, role-based auth using TanStack Query, React Hook Form, Zod, and MSSQL

Integration Manager

• •Designed and built a multi-tenant REST API platform that enables enterprise clients to integrate their ERP systems with robotPOS (Next.js, Prisma, PostgreSQL, MSSQL)
• •Developed 9 domain modules — currents, products, warehouses, transfers, waybills, supply documents, manufacture formulas, external documents, and product merging — each with full CRUD and validation
• •Implemented a layered security architecture: Bearer token auth, IP whitelisting, per-key & per-IP rate limiting, brute force protection, and per-company daily request quotas
• •Delivered Swagger-documented API with self-service access for enterprise clients under managed daily quotas

D-Charge App

• •Built station management dashboard with React.js and TypeScript for CRUD operations
• •Developed Node.js BFF layer handling invoices, user data, and OCPP logs
• •Implemented i18n, Sentry integration, and responsive UI with TailwindCSS