Markus Macalla — E-Commerce & Retail Operations. We operate active online retail sales across Amazon Europe and develop proprietary in-house systems for statutory VAT invoicing (§ 14 UStG) and ERP automation.
About Our Business
Founded by Markus Lukas Macalla (B.Sc. in Information Systems), our business operates active commercial retail sales across European e-commerce marketplaces, primarily focusing on Amazon Germany and Europe. We manage end-to-end retail fulfillment (FBA and commercial logistics), catalog inventory, and customer order processing.
To support our retail operations, our in-house development team builds and maintains proprietary internal business systems. Our primary integration connects with the Amazon Selling Partner API (SP-API) to automate statutory tax compliance—specifically generating legally compliant VAT invoices in accordance with German tax regulations (§ 14 UStG) and seamlessly uploading them via Amazon's VAT Calculation Service (VCS / Upload Your Own Invoices).
Private Developer & Data Security: All software, workflows, and integrations developed by our organization are used strictly and exclusively for our own Amazon seller account. We do not provide external development services or commercial software to third parties. We strictly uphold the Amazon Data Protection Policy (DPP) and EU GDPR, employing AES-256 encryption at rest, secure secret management, and automated 30-day PII deletion lifecycles.
In-House Systems & Operations
Automated VAT Invoicing Engine
Proprietary internal microservice integrating with Amazon SP-API (Orders & Reports) to generate legally compliant tax invoices (§ 14 UStG) and automatically upload them via the Feeds API (VCS Lite).
- Amazon SP-API
- TypeScript
- Next.js
- PDF Engine
- Tax Compliance
ERP & Multi-Channel Inventory Sync
Internal fulfillment dashboard synchronizing Amazon FBA inventory levels, pending orders, and accounting ledger entries with automated low-stock alerting.
- Python
- PostgreSQL
- REST APIs
- AWS
- Inventory Sync
Data Protection & Retention Manager
Automated compliance pipeline strictly enforcing Amazon DPP and GDPR data lifecycles, featuring AES-256 encryption at rest and automated 30-day PII purging post-shipment.
- Security
- AES-256
- GDPR
- Amazon DPP
- Docker
Core Competencies & Technology
- E-Commerce Operations
- Amazon SP-API Integration
- VAT Compliance (§ 14 UStG)
- Order & Invoice Automation
- Inventory Management (FBA)
- Data Protection & GDPR
- AES-256 Encryption
- TypeScript
- Next.js
- Python
- PostgreSQL
- REST APIs
- Docker
- AWS Cloud
- Git
- Tailwind CSS
Business & Operational Background
E-Commerce Merchant & Business Operations
DĂĽsseldorf, Germany
Active online retail trade across Amazon Europe and e-commerce channels. Managing product catalog, FBA logistics, inventory supply chains, and customer order fulfillment.
2019 - presentIn-House Systems & VAT Automation
DĂĽsseldorf, Germany
Developing and operating proprietary internal software for automated statutory VAT invoice generation (§ 14 UStG), Amazon SP-API reconciliation, and ERP accounting synchronization exclusively for our own retail store.
2021 - presentBachelor's Degree in Information Systems
Essen, Germany
Graduated from the University of Duisburg-Essen. Academic focus on enterprise software architecture, database management, cloud systems, and data security.
2021 - 2024Contact & Security Desk
For business communications or security incident escalation (IMPOC), please reach out directly at [email protected] or through this form.