Software Security Backend Engineer (Java) @ Mindbox Sp. z o.o.

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 

• 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 

,[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]

Requirements: Java, JVM, Spring, OpenID, Google Cloud Platform, Cloud, SQL, Kafka, PUB, Security, Backend
Additionally: Sport Subscription, Private healthcare, Life insurance, Training budget, Small teams, Free coffee, Free snacks, In-house trainings, Modern office, No dress code.