We are looking for a Technical Leader to join the team of one of our clients for a large-scale data center migration program. The role involves leading the migration of multiple business-critical applications—both proprietary and vendor-based—that support card acceptance, acquiring, and issuer processing operations.

Key Responsibilities

• Analyze and document the current (“as-is”) architecture of applications
• Define migration goals and facilitate transformation decisions (e.g., infrastructure or component upgrades, containerization, active-active models)
• Design and document the target (“to-be”) deployment architecture
• Create detailed migration plans for individual applications and application groups
• Coordinate application refactoring, dependency updates, and architecture adjustments when needed
• Specify and oversee the setup of new DEV / QA / UAT / PROD / DR environments in the target data center
• Identify firewall, load balancing, middleware, and database requirements and raise corresponding requests
• Guide testing of new deployments and migration scenarios, including PEN testing
• Support external and internal certification processes
• Lead production migration efforts while minimizing risk and avoiding “big bang” transitions
• Oversee the decommissioning of legacy environments after successful migration
• Maintain up-to-date technical documentation in Confluence (architecture diagrams, WBS, implementation plans)
• Collaborate closely with project managers to support task planning, execution, and issue resolution

Requirements

• Proven experience in technical leadership roles in migration or large deployment projects
• Strong understanding of complex application landscapes, including online systems and high-volume batch processing
• Familiarity with integration services, scheduling tools (e.g., Control-M), data/file replication, and shared network resources
• Ability to produce high-quality architecture documentation and work effectively with architects and competence centers
• Solid understanding of availability, performance, and resilience for transaction-heavy environments
• Experience with cloud platforms (AWS or Azure), containerization (Kubernetes), and CI/CD – a strong advantage
• Ability to work across multicultural teams, excellent communication skills in both English and Polish
• Capability to absorb technical knowledge by working closely with SMEs and development teams
• Self-driven, responsible, and results-oriented professional with the ability to take initiative and lead across different teams

If you're looking for a technically challenging leadership role where you can make a real impact on critical infrastructure and services, this is a great opportunity. You'll work in a dynamic, international environment on a high-priority initiative that affects essential business systems. Apply now!