Lead application migration within a data center migration program for payment card acquiring and issuing systems. Work closely with PM, architects, DevOps, infra/network teams, and occasionally external suppliers. Initial phase on-site, with occasional remote work; hybrid model possible after onboarding.Job responsibilities:• Analyze and document the current (“as-is”) state.• Define migration goals, strategy, and transformation scope (infra/app upgrades, containerization, HA, etc.).• Design target (“to-be”) deployment architecture and migration plan.• Refactor/test application code if needed (e.g., middleware, dependency upgrades).• Build new DEV/QA/UAT/PROD/DR environments in target data centers.• Define firewall, load balancing, middleware, and DB requirements.• Document solution and migration approach (Confluence)• Coordinate testing (functional, PEN, certifications) and production migration.• Support decommissioning of legacy environments and manage migration risks.• Work closely with PMs to define WBS, plan next actions, and remove blockers.Required qualifications to be successful in this role:• Proven experience in application or data center migration projects.• Strong communication in English and Polish.• Ability to document architecture and collaborate with SMEs and technical teams.• Broad technical knowledge: middleware, CI/CD, containerization (Kubernetes), AWS/Azure.• Understanding of performance, availability, monitoring, and networking (TLS, LB).• Knowledge of payment acquiring/issuing domain is an advantage.• Independent, goal-oriented, quality-focused, and collaborative.• Willingness to work on-site, 5 days a week in the Warsaw office, with occasional remote work – a mandatory requirementOur attractive offer contains:• 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 result• 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