Senior PHP Developer

SINGU•Paris Township, MI

1d•Hybrid

About The Position

We're looking for a Senior PHP Developer to join the Technical Account Management team, responsible for delivering customizations and dedicated functionalities for large enterprise clients, often international. The team focuses on adapting existing modules or building custom solutions tailored to specific customer needs. A significant part of the work involves data imports and system integrations, where security, data correctness, and database performance are critical. This is a hybrid position based in Kraków – 2-3 days per week from the office.

Requirements

Strong commercial experience in PHP backend development (5+ years)
Expert-level knowledge of relational databases, especially PostgreSQL – query optimization, indexing, execution plans
Proven experience in designing and implementing REST APIs
Experience building and maintaining data import pipelines and external system integrations
High attention to application security (secure coding practices, input validation, data protection)
Strong focus on performance and scalability, especially for database-heavy and high volume operations
Ability to take full ownership of delivered solutions – from design to deployment
Fluent English and Polish to ensure smooth communications with team colleagues and clients

Nice To Haves

Familiarity with React
Experience with the Phalcon framework
Experience with PostgreSQL performance tuning
Knowledge of Docker and containerized development environments
Background in customization-heavy or enterprise systems
Experience working in a product-oriented organization

Responsibilities

Delivering customizations and dedicated functionalities for large enterprise clients.
Adapting existing modules or building custom solutions tailored to specific customer needs.
Performing data imports and system integrations.
Ensuring security, data correctness, and database performance in all delivered solutions.
Taking full ownership of delivered solutions – from design to deployment.