Job DescriptionThe 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.

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!

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

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