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Offer summary
(Summary generated by AI based on the full job description)
The project focuses on building a Zero Trust security platform for the financial sector. Key stack includes Java 21, Spring Boot 3.x, GKE, Cloud Spanner / Cloud SQL (Postgres) and Kafka / Pub/Sub. Responsibilities cover designing and deploying secure scalable services, implementing OAuth2/OpenID Connect, developing event-driven architectures, automating delivery pipelines and promoting security best practices while mentoring engineering teams.
from: 15 October 2026
to: 14 November 2026
24 000 - 28 000 złnet (+ VAT)/ mth.B2B contract (full-time)
Offer parameters
level:mid • senior
working mode:hybrid
location:Kraków, Lesser Poland
Kraków, Lesser Poland
Requirements
Expected technologies
Java
Spring Boot
Kafka
Our 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)
Optional
- Demonstrated thought leadership via technical blogs, open-source contributions, or community engagement
Your responsibilities
- 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
- Note: Detailed project information will be shared during the recruitment process.
About the project
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.
This is how we organize our work
This is how we work
at the client's siteagile
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.
What we offer
- Flexible cooperation model
- Hybrid work setup – 6 days a month from the office in Kraków
- 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
Benefits
- sharing the costs of sports activities
- private medical care
- sharing the costs of professional training & courses
- life insurance
Mindbox Sp. z o.o.
At Mindbox, we connect top IT talents with technology projects for leading enterprises across Europe.
Our focus is on matching your skills with work that matters – projects that use modern tech stacks, solve real business challenges, and give you space to grow. By joining us, you’ll deliver technology solutions for well-known brands, supported by the Mindbox team that values knowledge-sharing and continuous development. We make sure you have the tools, flexibility, and guidance to do your best work – and to keep moving forward in your career.
Software Security Backend Engineer (Java)
24k–28k zł / mth. (B2B)
I apply to:
Mindbox Sp. z o.o.
Kraków, Lesser Poland
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