Backend Developer

Technologies we use

Expected

• Java
• Spring Boot
• Kubernetes
• AWS
• Swagger
• OpenAPI
• GitHub
• Jenkins
• Maven
• Groovy

Operating system

• Windows

About the project

Join the team driving transformation at the heart of customer communications. The Messaging Delivery Platform enables seamless, secure, and efficient outbound messaging to customers across multiple channels aligned with business strategy. This platform is undergoing modernization and standardization, offering a dynamic environment for engineers to work on innovative solutions that ensure reliability, scalability, and performance at an enterprise level.

As a Senior Java Developer, you will design, build, and maintain distributed systems and API-driven services using modern technology stacks in an Agile, DevOps-oriented environment.

Sounds like your kind of challenge?

This is how we organize our work

This is how we work

• agile

Your responsibilities

• Design and develop high-quality, scalable applications and services in compliance with industry and internal standards
• Deliver solutions on time, meeting all functional and non-functional requirements
• Participate in code reviews, challenge design and implementation decisions to ensure best practices
• Conduct unit and automated testing, ensuring coverage meets project standards
• Collaborate within Agile product teams, working closely with developers, architects, and stakeholders
• Implement and maintain API endpoints following OpenAPI 3.0 and RESTful design principles
• Contribute to automation and CI/CD pipelines, support deployment activities, and operational readiness
• Promote a culture of engineering excellence and continuous improvement through code quality, performance tuning, and mentoring junior engineers
• Ensure compliance, security standards, and alignment with organizational governance policies
• Note: Detailed project information will be shared during the recruitment process.

Our requirements

• Strong professional experience in Java and Spring Boot development
• Hands-on experience with Kubernetes for container orchestration
• Practical knowledge of AWS or other cloud platforms
• Expertise in REST API design and documentation (Swagger/OpenAPI 3.0)
• Proficiency with CI/CD tools: GitHub, Jenkins (shared libraries), Maven, Groovy
• Understanding of authentication and authorization protocols, particularly OAuth 2; experience with Kong API Gateway
• Familiarity with Agile methodologies, including TDD, Scrum practices, and automation frameworks
• Ability to troubleshoot complex technical problems and design innovative solutions
• Strong communication skills to work effectively with cross-functional teams

Optional

• Previous experience with event-driven architectures and distributed messaging systems
• Familiarity with observability stacks and performance monitoring tools
• Ability to provide technical leadership and mentoring within a team

What we offer

• Flexible cooperation model – choose the form that suits you best (B2B, employment contract, etc.).
• Hybrid work setup – 2 days a week 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.

This is how we work on a project

• TDD
• Continuous Deployment
• Continuous Integration
• DevOps
• testing environments

Benefits

• sharing the costs of sports activities
• private medical care
• sharing the costs of professional training & courses
• life insurance

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.

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.