System/DevOps Engineer – Online Charging Systems

About the role

T-Systems Iberia is hiring a System/DevOps Engineer (m/f/d) for its DevOps team, which supports the Online Charging System for prepaid voice and messaging services. The team handles system and interface design, monitoring, incident and problem analysis, release management, supplier coordination, upgrades, migrations and production rollouts. A key focus is introducing a new Converged Charging System from an external supplier on a Kubernetes-based private cloud, covering its integration, migration, operational readiness and future production operation.

Key responsibilities

• Develop technical concepts, system specifications and interface designs for the Online Charging System and connected systems.
• Install, configure, operate and continuously improve complex production systems and services.
• Monitor availability, performance and capacity, ensuring resilience, redundancy and failover capability.
• Analyze and implement requirements related to charging, rating, billing and comparable business logic.
• Perform hands-on incident, problem and root cause analysis using logs, metrics and monitoring data.
• Manage software upgrades, migrations and rollouts while coordinating with external suppliers and international teams.

Required profile

• Expertise in container orchestration (Kubernetes) on private cloud environments, including cluster deployment, configuration and lifecycle management.
• Deep understanding of Online Charging Systems (OCS), Converged Charging Systems (CCS), rating/billing logic and domain-specific protocols.
• Ability to author technical specs, design APIs/interfaces and integrate complex software with partner systems.
• Advanced log and metric analysis and root cause diagnosis for production incidents and high-throughput telecom traffic.
• Experience designing redundant systems, failover mechanisms, capacity planning and proactive monitoring.

What we offer

• International, dynamic and collaborative environment with a hybrid work model and flexible working hours.
• Customized training via Coursera, weekly English and German classes, mentoring sessions and experience days.
• Flexible compensation plan (health insurance, meal vouchers, childcare, transport), telemedicine and life and accident insurance.
• 26+ working days of vacation per year, specialist services access and salary coverage during medical leave.