Senior Full Stack Engineer

About the project

We are seeking an experienced Technical Lead with a primary focus on Java/Spring backend engineering and the ability to contribute to React + TypeScript UI delivery as needed. This is a hands-on leadership role, requiring strong technical depth, design capability, and proven experience leading teams in building resilient, production-ready solutions.

You will work in an Agile environment to design, develop, and deploy high-quality services utilizing modern microservices patterns, API-first principles, and containerized cloud-native architectures. This role offers a blended experience of technical leadership and active coding while mentoring others.

Sounds like your kind of challenge?

Your responsibilities

• Provide technical leadership and day-to-day guidance to engineers, ensuring alignment to best practices and delivery consistency
• Design, build, and support backend services and REST APIs using Java and Spring stack (Boot/Data/REST/Security)
• Take ownership of solution design, producing architecture documentation and diagrams (e.g., UML)
• Deliver end-to-end features, including front-end contributions in React + TypeScript where needed
• Implement microservices and micro-database patterns with strong API contracts
• Build event-driven integrations aligned with enterprise architecture patterns
• Integrate workflow engines using BPMN for process orchestration
• Ensure production readiness through robust logging, error handling, resilience design, and observability integration
• Develop and maintain batch processing capabilities where required
• Drive automated testing at all layers (unit, integration), enforce code scanning standards, and remediate findings proactively
• Containerize and deploy workloads via Docker and Kubernetes, ensuring secure and efficient CI/CD delivery to cloud environments
• Actively participate in Agile practices: backlog grooming, sprint planning, and delivery using Jira, Confluence/Wiki
• Note: Detailed project information will be shared during the recruitment process.

Our requirements

• 8+ years of enterprise application development with strong Backend Engineering focus
• 2+ years in formal technical leadership, including mentoring and technical delivery ownership
• Strong experience with Java and Spring ecosystem (Boot, Data, REST, Security)
• Hands-on experience with microservices architecture and micro-database design patterns
• Understanding of event-driven systems and integration patterns
• Working knowledge of ReactJS and TypeScript (able to deliver UI features when needed)
• Proficiency in API design and documentation using Swagger/OpenAPI
• Practical automated testing skills: JUnit, Mockito, H2, HTTP testing tools
• Hands-on experience with batch processing jobs (Spring Batch or similar)
• Strong expertise in error handling, logging, and observability practices
• Practical experience with containerization and orchestration: Docker, Kubernetes
• Exposure to cloud-native services development and deployment
• Familiarity with static code analysis and security scanning tools
• Strong Agile delivery experience (Scrum, Jira, Confluence)

Optional

• Domain experience in Risk and Compliance, particularly Model Risk Management
• Familiarity with Spring Integration, Spring Batch extensions
• Knowledge of WebSockets, SSE, or binary protocols
• Experience with Workflow Engines (e.g., BPMN, Flowable, Activiti, Drools)
• Exposure to Micro-frontends architecture and modularization best practices

What we offer

• Flexible cooperation model – choose the form that suits you best (B2B, employment contract, etc.)
• Hybrid work setup – 1 day 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

• Continuous Deployment
• Continuous Integration
• documentation
• issue tracking tools
• 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.