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# Senior Backend Developer PHP/Symfony - AI & E-Commerce

- **Company:** Hygi.de GmbH & Co. KG
- **Location:** Telgte, Germany
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Clean Code Principles, PHP (Programming Language), Artificial Intelligence, Automation of Tests, Code Generation, Code Review, Continuous Integration, Cursor, MySQL, Performance Tuning, Software Architecture, RabbitMQ, Redis, Symfony, GitHub Copilot, Retrieval-Augmented Generation, Large Language Models, Claude Code, Caching, AI Coding Agents, Backend, Agentic-AI, Git, Event Driven Architecture, Atlassian Tools, Microservices
- **Published:** October 23, 2026
- **Apply:** https://www.adzuna.de/details/5937562930

## About the Role

* At least 5 years of experience in backend development with modern PHP and Symfony
 * In-depth knowledge of software architecture, e.g., DDD, modular monoliths, microservices, or event-driven architecture
 * Very strong knowledge of MySQL, performance optimization, caching, and queuing
 * Practical experience with AI coding assistants or coding agents
 * A good understanding of when a technical solution is not only elegant but also economically sound
 * Excellent German and good English skills
 * A plus, but not required: Experience with LLM APIs, RAG, embeddings, vector databases, or agent-based workflows, as well as e-commerce systems and interfaces to ERP, payment, or logistics systems.
 * Experience in mentoring or providing technical guidance to other developers is also welcome.

OUR TECH STACK

 * Applications: PHP 8.x, Symfony
 * Data and Interfaces: MySQL, Redis, RabbitMQ
 * Delivery and Operations: On-premises hosting, Git, CI/CD
 * Collaboration: Jira and Confluence

## Description

As a Senior Backend Developer, you'll work in our backend team alongside three other developers and collaborate closely with our Shop Team Lead. You'll not only develop features but also actively help shape the architecture and technical standards., * You'll continue to develop our backend architecture using PHP 8.x and Symfony and make informed decisions regarding scalability, maintainability, and performance.

 * You'll design and develop sophisticated e-commerce features related to checkout, pricing logic, product catalog, search, and fulfillment.
 * You'll ensure high code quality through clean code, automated tests, code reviews, and CI/CD.
 * You use AI coding assistants and agents such as Claude Code, Cursor, or GitHub Copilot for development, refactoring, testing, and documentation.
 * Together with the team, you develop standards for AI-supported development workflows and critically review AI-generated code.
 * You identify productive AI use cases for our online store-such as smart search, product data enrichment, recommendations, or process automation.
 * You'll translate business goals into technical solutions while keeping an eye on KPIs such as conversion rate, cart value, margin, and process costs.
 * You'll serve as a technical sparring partner for product owners, developers, and other departments, and share your knowledge with the team.