Senior Java Backend Engineer - Scalable Travel Platforms

Solid Company sp. z o.o.; Kraków; On-site; PLN 240,000 - 360,000; Full time

Job summary

Solid Company sp. z o.o. in Kraków is seeking a Senior Java Developer to join a high-performance backend team building large-scale systems for travel and transportation.

You will design, implement, and optimize services and APIs powering mission-critical applications used by millions of users worldwide. The role requires 7+ years in backend Java development, strong expertise in Spring, Hibernate, RESTful services, and experience with cloud-native architectures.

Qualifications

• 7+ years of backend Java development experience.
• Strong knowledge of Java and Java EE technologies.
• Experience with Spring, Hibernate and RESTful APIs.
• Familiarity with cloud-native architectures.
• Ability to design scalable, reliable backend systems.

Responsibilities

• Design, develop, test, and debug complex backend services.
• Lead design and implementation of APIs powering travel platforms.
• Mentor developers and influence engineering best practices.
• Collaborate with Product and SRE to improve CI/CD and stability.
• Contribute to system architecture and code reviews.

Skills

Java

Spring

Hibernate

RESTful web services

OOP principles

XML

Relational databases

Linux-based development

CI/CD knowledge

Mentoring/team leadership

Tools

Maven

Gradle

Ant

Apache Camel

ServiceMix

Oracle SQL

Job description

Solid Company sp. z o.o. in Kraków is seeking a Senior Java Developer to join a high-performance backend team building large-scale systems for travel and transportation.

You will design, implement, and optimize services and APIs powering mission-critical applications used by millions of users worldwide. The role requires 7+ years in backend Java development, strong expertise in Spring, Hibernate, RESTful services, and experience with cloud-native architectures.