Senior Full Stack Engineer

At Mindbox we connect top IT talents with technology projects for leading enterprises across Europe. 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? What you get in return Flexible cooperation model Hybrid work setup – remote days available depending on the client’s arrangements - 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
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) Desirable / Nice to Have 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 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, REST API, Security, Microservices architecture, Design Patterns, React, TypeScript, UI, API, Swagger, OpenAPI, Testing, JUnit, Mockito, HTTP, Spring Batch, Docker, Kubernetes, Jira
Nice to have: Confluence, risk management, Spring Integration, Protocols, BPMN
Daily tasks: - 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