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Software Security Backend Engineer (Java)

Mindbox Sp. z o.o.
Poland September 24, 2026
JavaJVMSpringOpenIDGoogle Cloud PlatformCloudSQLKafka
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JavaJVMSpringOpenIDGoogle Cloud PlatformCloudSQLKafkaSecurityBackendSoftwareEngineer

About the role

• Expert knowledge of Java 21+ (including JVM internals, memory management, Project Loom) and modern Spring ecosystem • Solid experience with secure coding practices and building authentication/authorization flows using OAuth2/OpenID Connect • Proven experience with Google Cloud Platform components (particularly GKE, Cloud Spanner, Cloud SQL) • Strong practical experience in event-driven architecture with Kafka or Pub/Sub • Demonstrated ability to think strategically about risk, security, and future technology adoption • Influential leadership skills: capable of transferring expertise and guiding teams across the organization • Hands-on problem-solving mindset , adaptable across multiple domains (not just a network or back-end specialist, but a generalist who thrives on complex challenges) • Demonstrated thought leadership via technical blogs, open-source contributions, or community engagement is a plus Joining this project you’ll become part of Mindbox – a tech-driven company where consulting, engineering, and talent meet to build meaningful digital solutions. We’ll back you up every step of the way, accelerate your development, and ensure your skills make a difference.   At Mindbox we connect top IT talents with technology projects for leading enterprises across Europe.   We’re looking for a  highly skilled backend engineer with both strong hands-on coding expertise and deep security knowledge to shape next-generation security solutions. You will design and build secure, scalable services using modern Java , Spring Boot , and cloud-native technologies , contributing to a Zero Trust platform for one of the world’s leading financial institutions. This is more than just coding — you’ll drive industry best practices , mentor other engineers , and influence technology direction across a broad engineering community.  Sounds like your kind of challenge?  What you get in return • Flexible cooperation model – choose the form that suits you best (B2B, employment contract, etc.) • Hybrid work setup – remote days available depending on the client’s arrangements  • Collaborative team culture – work alongside experienced professionals eager to share knowledge  • Continuous development – access to training platforms and growth opportunities  • Comprehensive benefits – including Interpolska Health Care, Multisport card, Warta Insurance, and more  • High quality equipment – laptop and essential software provided  Java, JVM, Spring, OpenID, Google Cloud Platform, Cloud, SQL, Kafka, PUB, Security, Backend
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