Want to Make Waves in Tech? GBT Solutions Is the Place to Be! ?

About Us: GBT Solutions is a Portuguese technology company founded in 2018, part of the HFA Group established in 1995. With a focus on delivering cutting-edge solutions across various industries, we are committed to fostering a diverse and inclusive work environment and are proud to be recognized for our commitment to excellence and innovation.

Position: Telecommunications OSS Engineer (Traffica / OSIX / Mediation Zone)

Location: Madrid, Spain

Key Responsibilities

- Installation, configuration and maintenance of Traffica and OSIX (Polystar) monitoring systems.
- Operation and troubleshooting of Mediation Zone components delivering traffic from OSIX to Telefónica platforms.
- Management and optimization of Kafka pipelines and DeVo (Telefónica Big Data ecosystem).
- Monitoring and analysis of telecom protocols: SIP, Diameter, Radius, GTPv1, GTPv2.
- Support for mobile and fixed network environments, including NGN and IMS.
- System administration tasks on Linux Red Hat 8+ and Windows Server 2019+.
- Development and automation using Java, Python and Ansible.
- Participation in on-call and night work rotations when required.
- Occasional on-site interventions at Telefónica’s data center.

Requirements

- Spanish-speaking (mandatory).
- Based in Madrid or surrounding areas.




- Solid experience with Traffica and OSIX (Polystar).
- Experience with Mediation Zone and telecom traffic processing.
- Knowledge of Kafka and Big Data tools (preferably DeVo).
- Strong understanding of telecom protocols and network architectures (NGN, IMS).
- Hands-on experience with Linux Red Hat and Windows Server environments.
- Programming skills in Java, Python, Ansible.
- Intermediate English for reading documentation and communicating with product support teams in Sweden.
- Availability for night work

Equal Opportunity: GBT Solutions is an equal opportunity employer and values diversity.

We do not discriminate based on age, ethnicity, sexual orientation, gender, disability, or any other factor other than merit.

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📌 Telecommunications OSS Engineer (Bilbao)
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