Software Security Backend Engineer (Java)

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
Requirements:
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.
Must have: Java, JVM, Spring, OpenID, Google Cloud Platform, Cloud, SQL, Kafka, PUB, Security, Backend
Daily tasks: - Design, build, and deploy secure backend services leveraging Java 21 (Virtual Threads/Project Loom) and Spring Boot 3.x
– Implement Zero Trust architecture principles and OAuth2/OpenID Connect at the code level
– Build solutions optimized for Google Kubernetes Engine (GKE) and databases such as Cloud Spanner or Cloud SQL (Postgres)
– Develop event-driven architectures using Pub/Sub or Kafka
– Automate from the outset: reduce manual toil and accelerate secure delivery pipelines
– Apply best practices for software security across SDLC
– Research new technologies, guide adoption, and set the technical direction for the platform
– Mentor engineers and foster a culture of technical excellence and knowledge sharing
– Actively contribute to engineering communities and “raise the bar” in delivering secure, high-quality solutions
– Stay ahead of industry trends and communicate changes effectively to influence adoption