Junior Software Engineer (Java)

Sopra Steria is one of the largest players in the tech industry in Europe, known for its consulting, digital services and software development. We operate in nearly 30 countries in the world, hiring more than 55,000 employees.
The Polish branch, as the Global Delivery Center, operates in Katowice since 2007 and has been growing ever since. Currently, our team consists of around 1,000 specialists.

Within the Digital Platform Services department, our teams specialize in areas such as cloud, operating systems, virtualization, databases, backup or storage, as well as networking and security. We also have 1st line support consultants who speak French and English, but also Italian, Spanish, Portuguese and German.

The Application Services department is responsible for areas such as software development, data engineering, testing services, CRM, ITSM and ERP platform integrations, as well as application management for customers in Scandinavia, Benelux, France, Germany, Switzerland and the UK.

We are looking for a Junior Software Engineer (Java) to join Sopra Steria Polska and support the development team responsible for integrating the Simpl-Open middleware into the Language Data Space (LDS) ecosystem. In this role, you will contribute to software development, technical integration, configuration, testing, deployment support, and operational troubleshooting. You will collaborate closely with senior engineers, architects, and technical leads as part of a cross-functional engineering team delivering interfaces and runtime integrations between LDS components and Simpl-Open services.

Note that we can only offer cooperation to people who has EU citizenship, are located in Poland and are willing to commute to our office in Katowice, Poland.

Responsibilities:​

• 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.

Tech stack on the project:

​REST APIs, Keycloak, OAuth 2.0, OpenID Connect, Java, Spring Boot, JSON, YAML, OpenAPI, Docker, Kubernetes.

Must have requirements:​

• Strong proficiency in Java and Spring Boot for backend service development.
• Hands‑on experience with containerization and orchestration tools, specifically 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.
• Being open to occasional business trips abroad and visits to our office in Katowice.

Nice to have requirements:

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

What we offer:
• BENEFITS (UoP): Luxmed, Medicover Sport, Worksmile, educational platforms, languages learning platform, referral bonus, copyrights, life insurance, workation 
• DEVELOPMENT OPPORTUNITIES (UoP): certifications (paid by the company), conferences, Tech Lunches, possibility to join our Communities (Project Management, Architecture, Security, Process Management, Leadership, AI and Cloud)

The recruitment process for this position consists of two stages:
• a short phone call with a recruiter (30 min max)
• one-hour long interview on Teams (with both general and technical questions)

Salary range:

UOP: 5 500 - 8 500 PLN gross/month.
All information about salary range and its additional components will be provided during the 1st stage of recruitment process.

At our organization, we are committed to fighting against all forms of discrimination. We foster a work environment that is inclusive and respectful of all differences.