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Max SchmidtMS

Max Schmidt

WordPress & WooCommerce Developer | API

€640/day
Köln, DE
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Max

I am a specialized WordPress programmer and WooCommerce developer with a strong focus on API interfaces, automation, and custom system solutions.
I support companies in the technical further development of WordPress and WooCommerce platforms, the integration of external systems, and the optimization of complex business processes.

As a WordPress developer & API developer, I realize performant, maintainable, and cleanly documented solutions – from custom plugins and WooCommerce extensions to import/export and data mapping processes.

With over 11 years of experience in web development, PHP, WooCommerce, and API integration, I think not only technically but also process- and business-oriented.

AREAS OF EXPERTISE

1. WordPress & WooCommerce Development
- Custom WordPress and WooCommerce programming
- Development of tailor-made plugins
- Optimization and expansion of existing WooCommerce shops
- Performance optimization (Core Web Vitals, caching, database & query optimization)
- Custom Post Types, dynamic templates, ACF solutions
- Security & Maintenance

2. API Development & System Integration
- Development & integration of REST, SOAP, and GraphQL APIs
- Interfaces to ERP, CRM, and merchandise management systems
- WooCommerce API & WordPress REST API integrations
- Automated data transfer
- Webhooks & event-based processes

3. Automation, Data Mapping & Import/Export
- Automation of recurring processes
- Product & inventory imports for WooCommerce
- Processing of large data volumes & external data feeds
- Custom data mappings
- Cron job-based workflows

4. Configurators & Custom Tools
- Price & product configurators
- Inquiry & calculation tools
- Complex form logic
- Dynamic calculations (e.g., areas, prices, variants)

5. PHP Development & Technical Web Solutions
- Modern PHP development (OOP, best practices)
- Technical optimization of existing systems
  • German

    Native or bilingual

  • English

    Conversational

Can work on-site
Köln (up to 50km), Dortmund (up to 50km), Hamburg (up to 50km), Berlin (up to 50km), Cassel (up to 50km)

Experience

  • Historischer Bahnhof Ahütte
    Booking System and Game App
    E-COMMERCE
    March 2026 - April 2026 (1 month)
    In this project, a booking system was developed based on WordPress/WooCommerce. This is linked to a web app where the booked games are automatically imported and released for the logged-in user. With the app on their mobile phone, users can then play the games on the historical railway premises.
    The web app and the WordPress/WooCommerce system are coupled via an API.
    WordPress WooCommerce API JavaScript Import-Export
  • esco antriebstechnik gmbh
    WooCommerce Plugin: Multiple Shipping Addresses + API Integration to ERP
    E-COMMERCE
    January 2026 - January 2026
    Troisdorf, Germany
    Development of a custom WordPress/WooCommerce plugin that allows multiple shipping addresses per customer during checkout. Customers can select their shipping addresses, while address management is handled by an external middleware.
    The solution includes an API integration for automatically creating and synchronizing shipping addresses. Additionally, the address selected during checkout, including the address ID, is passed via API to downstream systems, enabling an ERP system to uniquely identify and process the order.
    Focus areas included clean extension of WooCommerce checkout logic, stable data flows via REST APIs, and a maintainable plugin architecture in PHP.
    WordPress WooCommerce WordPress Plugin REST API ERP Integration
  • Fulfillment Mail + Marketing GmbH
    Intranet Shop on WordPress/WooCommerce: Orders & Returns per Event + Batch Control
    E-COMMERCE
    December 2025 - January 2026 (1 month)
    Elmshorn, Germany
    Implementation of a closed intranet shop based on WordPress and WooCommerce for promoters, used exclusively for internal orders. Access is via a custom login mask and a protected environment (no public shop).
    The shop was implemented as a pure shipping/ordering system: payment functions and prices were completely removed, the focus is on a clear ordering process. Orders are recorded on an event basis and assigned to an event. Additionally, a returns system was integrated that also manages returns on an event and user basis.
    Another central feature is batch control (batch numbers per product / inventory per batch) to make the issuance and return of items traceable. Overall, a stable system was created that automates internal processes and significantly simplifies handling.

    Technologies & Focus Areas:
    WordPress, WooCommerce, Custom Development, Roles/Permissions, Custom Login, Process Digitization, Returns, Batch Management, PHP
    WordPress WooCommerce WordPress Plugin WooCommerce Development WordPress Programmer

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Education

  • B.Sc. Mechanical Engineering (Process Optimization)
    TH Köln
    2016

Skill set

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