This position is at T-Systems

The selection process will be entirely managed by T-Systems.

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Job Description

Project Description

The DevOps team is responsible for the technical integration, production operation, lifecycle management and continuous development of the Online Charging System supporting prepaid voice and messaging services. Its scope includes system and interface design, monitoring, incident and problem analysis, release management, supplier coordination, upgrades, migrations and production rollouts. A key focus is the introduction of a new Converged Charging System from an external supplier on a Kubernetes-based private cloud. The team will be responsible for its technical integration, migration, operational readiness and future production operation. The team collaborates closely with project management, validation management, suppliers and the owners of connected partner systems in an international environment.

Activity Description

- 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 and ensure resilience, redundancy and failover capability.
- Perform hands-on incident, problem and root cause analysis using logs, metrics and monitoring data.
- Analyze and implement requirements related to charging, rating, billing and comparable business logic.

Qualifications

Skills Requirements

- Kubernetes & Cloud Infrastructure: Expertise in container orchestration (Kubernetes) on private cloud environments, including cluster deployment, configuration, and lifecycle management.
- Telecom Core & Charging Systems: Deep understanding of Online Charging Systems (OCS), Converged Charging Systems (CCS), rating/billing logic, and domain-specific protocols.
- System Design & Interface Integration: Ability to author technical specs, design APIs/interfaces, and handle complex software integration with connected partner systems.
- Observability & Incident Analysis: Advanced log/metric analysis and hands-on root cause diagnosis to troubleshoot complex production incidents and high-throughput telecom traffic.
- High Availability & Resilience: Mastery in engineering redundant systems, failover mechanisms,



capacity planning, and proactive monitoring to guarantee high uptime.
- Release & Vendor Coordination: Experience managing software upgrades, migrations, and rollouts while collaborating with external suppliers and cross-functional international teams.

Additional Information

What do we offer you?

Work environment & flexibility

- International, dynamic and collaborative environment.
- T-Social: social initiatives (sports, community, health, ...).
- Hybrid work model (remote/on-site).
- Flexible working hours.

Growth & development

- Customized training: access to Coursera to learn whatever you want, whenever you want.
- Weekly language classes (English & German).
- International Mentoring Sessions & Experience Days.

Compensation & benefits

- Adaptable compensation plan (health insurance, meal vouchers, childcare, transport).
- Telemedicine.
- Life and accident insurance.
- Social fund.

Wellbeing & time off

- 26+ working days of vacation per year.
- Free access to specialists services (medical, legal, wellness).
- 100% salary coverage during medical leave.
- And many more advantages of being part of T-Systems!

If you are looking for a new challenge, do not hesitate to send us your CV! Please send CV in English. Join our team! T-Systems Iberia will only process the CVs of candidates who meet the requirements specified for each offer.

Your Task

The DevOps team is responsible for the technical integration, production operation, lifecycle management and continuous development of the Online Charging System supporting prepaid voice and messaging services. Its scope includes system and interface design, monitoring, incident and problem analysis, release management, supplier coordination, upgrades, migrations and production rollouts. A key focus is the introduction of a new Converged Charging System from an external supplier on a Kubernetes-based private cloud. The team will be responsible for its technical integration,



migration, operational readiness and future production operation. The team collaborates closely with project management, validation management, suppliers and the owners of connected partner systems in an international environment.

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 and ensure resilience, redundancy and failover capability
- Perform hands-on incident, problem and root cause analysis using logs, metrics and monitoring data
- Analyze and implement requirements related to charging, rating, billing and comparable business logic

Your Profile

We are looking for a DevOps Engineer with deep expertise in Kubernetes-based cloud infrastructure, telecom charging systems, and high-availability production operations. The ideal candidate will have strong technical skills in system design, observability, incident analysis, and vendor coordination in an international environment.

Must Have Skills

- Expertise in container orchestration with Kubernetes on private cloud environments
- Experience with Kubernetes cluster deployment, configuration, and lifecycle management
- Deep understanding of Online Charging Systems (OCS)
- Deep understanding of Converged Charging Systems (CCS)
- Knowledge of rating and billing logic
- Understanding of domain-specific telecom protocols
- Ability to author technical specifications
- Ability to design APIs and interfaces
- Experience with complex software integration with connected partner systems
- Advanced log and metric analysis skills
- Hands-on root cause diagnosis capabilities
- Experience troubleshooting complex production incidents
- Experience with high-throughput telecom traffic troubleshooting
- Mastery in engineering redundant systems
- Expertise in failover mechanisms
- Experience with capacity planning
- Proactive monitoring skills to guarantee high uptime
- Experience managing software upgrades, migrations, and rollouts
- Experience collaborating with external suppliers
- Experience working with cross-functional international teams

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📌 System/Devops Engineer (M/F/D) (Gijón)
🏢 T-Systems
📍 Gijón