Senior Java Backend Developer

Quick Facts

• Role: Senior Java Backend Developer (Java EE/Jakarta EE modernization)

• Focus: Upgrade and stabilization of a mission-critical banking system

• Work: Remote within Poland, with optional office work

Description

You will help modernize and stabilize an existing Java Enterprise banking application by assessing current architecture, refactoring for compatibility, and coordinating upgrade activities. The work includes integration with QA and DevOps teams, plus thorough documentation and knowledge transfer to client teams. This is a consulting role centered on upgrading rather than greenfield development.

Responsibilities

• Analyze the existing application architecture, dependencies, and configurations to identify upgrade impacts

• Refactor and optimize code to ensure compatibility with new versions

• Collaborate with architects, QA, and DevOps to support smooth integration, testing, and deployment

• Document upgrade steps, migration guidelines, and technical challenges/resolutions

• Support knowledge transfer and provide guidance to client technical teams after the upgrade

Requirements

• 5+ years of Java development in enterprise environments

• Hands-on Java EE/Jakarta EE experience, including EJB

• Experience upgrading/migrating large-scale, mission-critical systems

• Solid understanding of enterprise integration patterns, deployment pipelines, and performance tuning

• Strong problem-solving and debugging skills

• Flexible availability for occasional overlap until 1:00 PM ET / 7:00 PM CET

• Banking/financial services experience is a plus

Benefits

• Healthcare (Medicover) paid by CGI, including free dental package

• Share purchase plan co-financed by CGI (cash out option)

• Sport card

• Employee psychological support program

• Annual bonus plan based on annual financial results

• Referral program (minimum PLN 6k)

• Be Consultant program to strengthen competences

• Mentoring program

• Possibility of accounting for creative work (author’s tax-deductible costs)

• Training program (Brown Bags, hackathons, knowledge sharing)

• Additional insurance (life, accident, serious illness)

• Additional childbirth insurance