Senior Java Backend Developer

We are seeking an experienced Senior Java EE Developer to join a consulting team for a high-impact modernization and upgrade project within a mission-critical banking system.

The role focuses on upgrading and stabilizing an existing Java Enterprise (Java EE / JEE) application, including components based on Enterprise JavaBeans (EJB), application servers, and persistence layers. The ideal candidate has hands-on experience with Java EE technologies, including EJB, and has actively participated in technical upgrades or migrations of large-scale enterprise systems, rather than only greenfield development.

Remote work within Poland, with the option to work from offices in multiple cities.

Job responsibilities

• Perform a technical upgrade of the banking application.
• Analyze the existing application architecture, dependencies, and configurations to identify upgrade impacts.
• Refactor and optimize code as needed to ensure compatibility with new versions.
• Collaborate with architects, QA, and DevOps teams to ensure smooth integration, testing, and deployment.
• Document upgrade steps, migration guidelines, and technical challenges and resolutions.
• Support knowledge transfer and provide guidance to client technical teams post-upgrade.

Required qualifications

• 5+ years of Java development experience in enterprise environments.
• Hands-on experience with Java EE / Jakarta EE technologies, including Enterprise JavaBeans (EJB) and application servers such as JBoss/WildFly, WebLogic, and WebSphere.
• Proven experience with application upgrade or migration projects in large-scale, mission-critical systems.
• Solid understanding of enterprise integration patterns, deployment pipelines, and performance tuning.
• Strong problem-solving and debugging skills.
• Flexibility to work until 1:00 PM ET / 7:00 PM CET occasionally and as needed.

Nice to Have Skills

• Familiarity with JPA specifications and persistence migration best practices.
• Exposure to containerization and cloud platforms such as OpenShift, Kubernetes, AWS, and Azure.
• Knowledge of CI/CD pipelines and modern DevOps practices.
• Strong communication and consulting skills for client-facing interactions.
• Experience with AI tools.
• Knowledge of database performance.
• Knowledge of security.
• Experience with website load/performance tools and best practices related to performance parameters and metrics.
• Java upgrade experience.
• Experience with monolith decomposition into microservices.
• Architecture skills.
• Experience in the banking or financial services industry.

What we offer

• Healthcare with a free dental package.
• Share purchase plan, with the possibility of cashing out at any time.
• Sport card.
• Employee psychological support program.
• Annual bonus plan, depending on annual financial results.
• Referral program with a minimum PLN 6k reward for a recommendation.
• A program to strengthen competencies.
• Mentoring program.
• Possibility of accounting for creative work through author’s tax-deductible costs.
• Training program including Brown Bags, hackathons, and knowledge sharing.
• Additional life, accident, serious illness, and childbirth insurance.