Jan-Erik Spreng

Jan-Erik Spreng

Senior Backend Engineer

Shopware Expert & E-Commerce Specialist

About

I'm a Senior Backend Engineer specializing in Shopware e-commerce development. With over a decade of experience in web development, I focus on building scalable online shops, developing custom plugins, and optimizing performance. I've been Shopware certified since 2015 and hold multiple certifications including Shopware 6 Certified Advanced Developer.

Currently working at B2Bsellers GmbH, I handle development for B2B e-commerce solutions, system architecture, and technical consulting for (enterprise) Shopware 6 projects. My expertise spans the full stack from backend architecture with PHP and Symfony to frontend development and DevOps practices.

Experience

Lead Developer

Jul 2024 - Present

B2Bsellers GmbH

  • Development for B2B e-commerce solutions
  • Shopware 6 development and optimization
  • System architecture and technical consulting

Technical Lead

Apr 2024 - Jul 2024

Seidemann Web GmbH

  • E-commerce development
  • Technical leadership and mentoring
  • Complex Shopware projects

Technical Engineering

Jan 2023 - Mar 2024

Kellerkinder GmbH

  • Technical architecture and engineering leadership
  • Complex system design and implementation
  • Performance optimization and scalability

Customer Success Manager

Jan 2021 - Dec 2022

Kellerkinder GmbH

  • Client relationship management and technical consulting
  • Requirements analysis and project coordination
  • Solution design for customer-specific challenges

Senior Developer

Jan 2018 - Dec 2020

Kellerkinder GmbH

  • Shopware plugin development and customization
  • Backend development with PHP and Symfony
  • Code reviews and team mentoring

Software Developer

Aug 2015 - Dec 2017

Star Cooperation GmbH

  • Consulting & Concept Development
  • Requirements Management
  • Webshop / Plugin Development
  • Website Maintenance
  • Security / Maintenance
  • 2nd-Level Support

Software Developer PHP

Jul 2012 - Jul 2015

21TORR GmbH

  • Concept Development for International Projects
  • Support in Proposal Creation
  • Website / Web Tools Development
  • 1st-Level Support

Fachinformatiker Systemintegration (IT Specialist System Integration)

Sep 2009 - Jun 2012

Transline Deutschland Dr.-Ing. Sturz GmbH

  • Development of Process Automation
  • Server / Domain Management
  • Website Maintenance
  • 1st-Level Support

Education

Fachinformatiker Systemintegration (IT Specialist System Integration)

2009 - 2012

Ferdinand-von-Steinbeis-Schule Reutlingen

Certifications

  • Shopware 6 Certified Developer Advanced
  • Shopware 6 Certified Developer
  • Shopware 5 Certified Developer Advanced
  • Shopware 5 Certified Developer

Skills & Expertise

Shopware 6 Shopware 5 PHP Symfony JavaScript MySQL E-Commerce Plugin Development Performance Optimization REST APIs Git Docker Requirements Analysis Technical Consulting HTML/CSS Web Development