Senior Java Developer: Spring Microservices & TDD

Solid Company; Kraków; Hybrid; PLN 120,000 - 180,000; Full time

Job summary

Solid Company in Kraków is seeking a senior Java developer to join the team building Flight Plan Manager, a sophisticated flight planning solution used by major airlines. You will design and implement new features within a Scrum team and ensure code quality through automated tests.

The platform supports on-premises and SaaS deployment, uses Spring, Hibernate, microservices, and modern DevOps practices. Fluency in English and Polish is expected.

Qualifications

• 5+ years of professional Java development experience.
• Strong knowledge of Spring and Hibernate.
• Understanding of microservices architecture.
• Experience with API design and SQL databases.
• Knowledge of SOLID principles and design practices.
• Experience with Git and Docker.
• Familiar with Scrum or Kanban methodologies.
• Fluent in English and Polish.

Responsibilities

• Design, develop, and estimate new product features within a Scrum team.
• Develop automated tests and apply Test-Driven Development (TDD) practices.
• Maintain and refactor complex codebases, including legacy systems.
• Apply SOLID principles and software engineering best practices.
• Debug applications, analyse performance, and resolve functional and non-functional issues.
• Participate in code reviews and technical documentation.
• Collaborate with distributed engineering teams and demonstrate solutions to internal and external customers.

Skills

Java

Spring

Hibernate

Microservices

API design

SQL databases

SOLID principles

Git

Docker

Scrum/Kanban

English

Polish

Analytical thinking

Job description

Solid Company in Kraków is seeking a senior Java developer to join the team building Flight Plan Manager, a sophisticated flight planning solution used by major airlines. You will design and implement new features within a Scrum team and ensure code quality through automated tests.

The platform supports on-premises and SaaS deployment, uses Spring, Hibernate, microservices, and modern DevOps practices. Fluency in English and Polish is expected.