Senior Java Backend Engineer

Technologies we use

About the project

Your responsibilities

• Design, build, and maintain Java-based backend services and REST/SOAP APIs powering AI-enabled solutions: clean interfaces, robust domain models, and maintainable data access patterns.
• Deliver cloud-native microservices using Docker and Kubernetes, with attention to scalability, resilience, and cost.
• Integrate and standardize API exposure via gateway patterns, including authentication/authorization, versioning, and usage policies.
• Establish and maintain observability standards using Dynatrace and other monitoring tools (dashboards, alerting, distributed tracing, and runbooks).
• Diagnose and resolve complex issues across microservices, clusters, and pipelines; perform root-cause analysis and preventative improvements.
• Embed security and resilience: secrets management, Keycloak-based authentication, least privilege, container security best practices, and disaster recovery patterns.
• Engineer for regulated environments: implement audit-friendly practices such as traceable changes, reliable logging, and disciplined handling of sensitive data.
• Collaborate with ML Engineers, Platform Engineers, AI Architects, and DevOps to deliver shared foundations and consistent standards across global teams.
• Champion Claude Code as an active daily tool for development, debugging, code review, and documentation tasks.

Our requirements

• Proficiency in Java 17+ and backend technologies such as REST, SOAP, JSON, YAML, XML.
• Familiarity with Git/GitHub, Docker, SQL (DB2, PostgreSQL), CoPilot/Claude Code, Maven, Kubernetes/AWS, Jenkins/GitHub Actions/Nexus.
• Knowledge of Keycloak, Dynatrace, A3K Framework, Airwave, CISL API, Jira/Confluence.
• An agile mindset with experience in Agile methodologies and English proficiency at B2 level.
• Basic knowledge of AI technologies, principles, and their practical use.

Optional

• German language skills are an advantage.

This is how we organize our work

This is how we work

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What we offer

• Contract under Polish law: B2B or Umowa o Pracę
• Benefits such as private medical care, group insurance, Multisport card
• English classes available
• Hybrid work (at least 1 day/week on-site) in Warsaw (Mokotów)
• Opportunity to work with excellent professionals
• High standards of work and focus on the quality of code
• New technologies in use
• Continuously learning and growth
• International team
• Pinball, PlayStation & much more (on-site)

Benefits