Senior PHP Engineer

About the role

Jaggaer is a global provider of AI-powered procurement software used by more than 1,400 enterprises to manage sourcing, contracts, invoicing, payments and supplier relationships. As a Senior PHP Engineer you will build and enhance product features in a large, business-critical PHP application, focusing on backend functionality and contributing to the gradual modernization of the platform. This is a hands-on senior engineering role with significant technical ownership.

Key responsibilities

• Develop and evolve backend functionality for Jaggaer's hosted B2B SaaS platform based on secure-by-design principles.
• Work within a cross-functional team alongside frontend engineers, backend engineers, QA and Product Owners.
• Take ownership of backend components in a large PHP monolith and contribute to its continuous improvement and refactoring.
• Solve complex technical challenges involving performance, scalability, data integrity and maintainability.
• Write clean, maintainable PHP code and participate in code reviews and technical discussions.
• Debug production issues and continuously improve platform stability.
• Leverage AI-assisted software engineering to speed up implementation, testing, debugging and documentation, and critically evaluate AI-generated solutions for correctness, security, scalability and business suitability.
• Work across modern engineering practices and legacy systems.

Required profile

• 7+ years of professional software development experience with strong PHP expertise.
• Experience with large, long-lived PHP applications, including monolithic architectures.
• Strong knowledge of Symfony or similar PHP frameworks with ORM support.
• Excellent knowledge of object-oriented programming, SOLID principles and design patterns.
• Ability to structure codebase context (modules, naming conventions, architectural constraints) to improve AI code-generation reliability, and to judge AI-generated code critically.
• Comfortable in a collaborative, international engineering environment; good command of written and spoken English.
• Nice to have: frontend experience with JavaScript (Backbone.js and/or React), MongoDB or other NoSQL databases, caching technologies such as Memcached, exposure to large-scale SaaS platforms, observability tools, and a degree in Software Engineering or Computer Science.

Required skills

• PHP and Symfony
• MySQL and relational database design
• Composer and dependency management
• Algorithms and data structures