Senior 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 Senior Software Engineer (Java) to join Sopra Steria Polska as part of the delivery team responsible for integrating the Simpl‑Open middleware into the Language Data Space (LDS).

In this role, you will focus on secure participant onboarding, connector and middleware interoperability, identity and access integration, metadata publication and discovery, vocabulary alignment, and production‑ready delivery. You will design and implement technical integrations between LDS platform components and Simpl‑Open middleware services.

This position combines backend engineering, systems integration, identity and trust services, metadata and semantic interoperability, and operational readiness within a federated, multi‑stakeholder environment.

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:​

• Design and implement APIs, adapters, connectors, and integration services between LDS components and Simpl-Open capabilities.
• Implement participant onboarding, secure communications setup, and connector registration workflows.
• Integrate authentication, authorization, role assignment, attribute mapping, and directory-connected
• access-management patterns.
• Implement metadata publication, catalogue interaction, discovery flows, validation rules, and transformation logic.
• Support vocabulary management, semantic mappings, and multilingual metadata interoperability.
• Contribute to deployment automation, integration testing, observability, troubleshooting, and technical documentation.

Tech stack on the project:

​REST APIs, Keycloak, Identity and Access Management OAuth 2.0, OpenID, Connect Role-Based Access Control (RBAC), Attribute-Based Access Control (ABAC), Java, Spring Boot, JSON, YAML, OpenAPI, Docker

Must have requirements:​

• Strong proficiency in Java and Spring Boot for building scalable backend applications and implementing service‑to‑service communication.
• Hands‑on experience with containerization technologies, particularly Docker, including building, running, and troubleshooting containerized applications.
• Experience working with REST APIs and API specification formats such as OpenAPI, using JSON and YAML for defining and documenting services.
• Knowledge of modern authentication and authorization standards, including OAuth 2.0 and OpenID Connect, and the ability to integrate secure identity flows into backend services.
• University degree in Computer Science, Software Engineering, Information Systems, Telecommunications, or equivalent experience.
• Several years of hands-on experience in backend engineering, middleware engineering, platform integration, or distributed-systems delivery.
• Strong command of API-based integration, authentication and authorization integration, containerized delivery, and operational support.
• EU citizenship.
• Fluent English: B2/C1.
• Being open to occasional business trips abroad and visits to our office in Katowice.

Nice to have requirements:

• Experience with Keycloak or comparable identity platforms.
• Experience with data catalogues, metadata validation, vocabulary management, or schema-governance mechanisms.
• Experience with container platforms, CI/CD, logging and monitoring stacks, and automated deployment practices.
• Experience with data spaces, interoperability frameworks, or European digital-platform environments

What we offer:
• BENEFITS (UoP): Luxmed, Medicover Sport, Worksmile, educational platforms, languages learning platform, referral bonus, copyrights, life insurance, workation
• DEVELOPMENT OPPORTUNITIES (UoP and B2B): 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: 12 000-16 000 PLN gross/month.

B2B: 100-140 PLN net/h

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.