Tech Lead Full Stack Developer

We are looking for an experienced Tech Lead to join our team in Cracow. In this hybrid role, you will lead the design and development of backend services and APIs, contributing to both backend and frontend components using Java, Spring, React.js, and TypeScript. You will work in an Agile environment, collaborating with a talented team to deliver high-quality software solutions. If you are passionate about building scalable microservices and enhancing user experiences, this opportunity may be the right fit for you. Your tasks Leading technical teams and providing guidance to team members on best practices and solutionsDesigning, building, and supporting backend services and APIs using Java and Spring FrameworkDelivering end-to-end features, including frontend work with React and TypeScript as neededImplementing microservices and micro-database patterns with clear API contractsBuilding integrations using event-driven architectureDeveloping workflow-driven capabilities and integrating workflow components into servicesEnsuring production readiness through effective logging, error handling, resilience, and observabilityDriving quality through automated unit and integration testing, code scanning, and remediation of findingsContainerizing applications and deploying using Docker and Kubernetes, supporting cloud services developmentWorking in an Agile (Scrum) model and documenting processes in Confluence/Wiki Requirements Minimum 8 years of experience in enterprise application development with a strong focus on backend engineeringDeep expertise in Java and the Spring Framework, including Boot, Data, REST, and SecurityHands-on experience with microservices architecture and event-driven systemsProficiency in frontend technologies, specifically React.js and TypeScript, to contribute meaningfully to UI developmentStrong automated testing practices, including experience with JUnit and mocking frameworksExperience with Docker and Kubernetes for containerization and deploymentFamiliarity with cloud services development and API specification/documentation using Swagger or OpenAPIComfortable working in Agile/Scrum teams using JIRA and ConfluenceAdvanced level of EnglishWillingness to work from the Kraków office twice a week Nice to have Knowledge of Risk & Compliance domain, ideally Model Risk ManagementExperience with Spring Integration and/or Spring BatchFamiliarity with WebSockets, SSE, or binary protocolsWorking knowledge of workflow engines/libraries such as BPMN, Flowable, Activiti, or Drools Job no. JOB-XM9ZV Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws. Benefits For You Great Place to WorkSolid financial situationContracts with the biggest brandsCentre of internal trainingsMany experts you can learn fromOpen and accessible management teamProfit sharingPassion Sponsorship programRegular integration events and tripsComfortable and well-equipped officesMySii appMedical care