Junior Software Engineer (Java)

Sopra Steria is one of the largest players in the tech industry in Europe, known for consulting, digital services, and software development. The Polish branch operates in Katowice since 2007 with around 1,000 specialists. The Digital Platform Services department specializes in cloud, operating systems, virtualization, databases, backup, storage, networking, and security. The Application Services department handles software development, data engineering, testing services, CRM, ITSM, ERP platform integrations, and application management for customers in Scandinavia, Benelux, France, Germany, Switzerland, and the UK.

• Strong proficiency in Java and Spring Boot for backend service development.
• Hands-on experience with Docker and Kubernetes.
• Experience with backend development and API-based integration.
• Good command of secure application integration and service-to-service communication.
• Experience with version control, debugging, testing, and software delivery practices.
• Familiarity with containerized environments and deployment support activities.
• Ability to analyze issues methodically and deliver reliable technical fixes.
• Willingness to learn, document work clearly, and contribute in a team-oriented delivery setting.
• Experience working with REST APIs and API specification formats such as OpenAPI using JSON/YAML.
• Knowledge of authentication and authorization technologies, including Keycloak, OAuth 2.0, and OpenID Connect.
• Degree in Computer Science, Software Engineering, Information Systems, Telecommunications, or equivalent practical experience.
• Professional experience in software development, systems integration, platform engineering, or backend delivery.
• EU citizenship.
• Fluent English: B2/C1.
• Willingness to commute to the office in Katowice and occasional business trips abroad.

Nice to have:

• Exposure to identity and access management platforms, metadata catalogues, semantic technologies, or data-platform delivery.
• Experience with public-sector digital platforms, interoperability solutions, or EU-funded technical environments.

• Implement backend services, API integrations, and technical adapters under the guidance of senior engineers.
• Configure and integrate identity, authentication, authorization, and connector-related services.
• Develop and maintain integration logic for metadata exchange, catalogue interfacing, and validation flows.
• Support vocabulary-related interoperability, mappings, and configuration tasks.
• Prepare and execute technical tests, including integration tests, deployment verification, and regression checks.
• Investigate incidents, defects, and integration issues in development and test environments.
• Contribute to CI/CD activities, containerised deployments, and runtime support tasks.
• Produce concise technical documentation, configuration notes, and implementation handover material.

Only candidates with EU citizenship located in Poland and willing to commute to the Katowice office are eligible for cooperation.