Senior Java Backend Developer (on-site)

We are seeking an experienced Developer to join our consulting team for a high-impact modernization project. The role involves upgrading a mission-critical application’s technical stack to ensure scalability, compliance, and long-term maintainability. The ideal candidate will have hands-on experience with Java enterprise application upgrades and a strong understanding of middleware, ORM frameworks, and build tools.

The role requires working from the office 5 days/week

Job responsibilities:

• Perform a technical upgrade of the banking application, including:

• Analyze 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/resolutions.

• Support knowledge transfer and provide guidance to client technical teams’ post-upgrade.

Required qualifications to be successful in this role:

• 5+ years of Java development experience in enterprise environments.

• Proven experience with application upgrade/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.

• Experience in the banking or financial services industry is a plus.

• Ability to work five days a week in one of CGI’s offices in Poland – must have

• Flexibility to work until 1pm ET (7pm CET) occasionally and as needed

Nice-to-Have Skills:

• Familiarity with JPA specifications and persistence migration best practices.

• Exposure to containerization and cloud platforms (e.g., OpenShift, Kubernetes, AWS, Azure).

• Knowledge of CI/CD pipelines and modern DevOps practices.

• Strong communication and consulting skills for client-facing interactions.

Our attractive offer contains:

• Work from our office in Warsaw/Wroclaw/Torun

• Healthcare / Medicover paid by CGI with a free dental package

• Share purchase plan co-financed by CGI, with the possibility of cashing at any time

• Sport card• Employee psychological support program

• Annual bonus plan, depending on the annual financial results

• Rewarded referral program, minimum PLN 6k for recommendation

• Be Consultant program, thanks to which you have the opportunity to strengthen your competences

• Mentoring program• Possibility of accounting for creative work (author's tax-deductible costs)

• Attractive training program - Brown Bags, hackathons and knowledge sharing

• Additional insurance - life, accident and serious illness insurance

• Additional childbirth insurance