Backend Developer

At Mindbox we connect top IT talents with technology projects for leading enterprises across Europe. 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? 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 - 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
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 Nice to Have 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 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, Spring Boot, Kubernetes, AWS, Cloud platform, REST API, Swagger, OpenAPI, CD, GitHub, Jenkins, Maven, Groovy, Protocols, OAuth, API Gateway, TDD
Nice to have: Communication skills
Daily tasks: - 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