Senior Roaming Operations Engineer

• Provide second-line support for Instant Roaming, Open-Connectivity Roaming (Roaming Hub), SMS Translator, Steering of Roaming, Managed PGW, and related services
• Monitor network and service availability and quality
• Perform proactive and reactive maintenance activities
• Manage incidents and carry out planned maintenance work
• Participate in new service implementation and network rollout projects with engineering teams
• Collaborate with Product Management, Presales, and second-line customer support teams
• Gather information, logs, and traces; validate routing and data transfer
• Ensure high service availability and quality
• Work with vendors and monitor their performance and service delivery
• Support customers worldwide with roaming-related issues
• Cooperate with mobile operators and Travel SIM companies
• Apply knowledge of network architecture, signaling protocols, and interfaces
• Train new and existing team members
• Support workload planning for business continuity during holiday periods
• Participate in an on-call rotation one week per month

• Bachelor’s or Master’s degree in Electronics, Telecommunications, IT, ICT, or a related field
• Minimum of 3–5 years of experience in telecommunications, primarily in signaling or roaming
• Strong understanding of network architecture, SS7/SIGTRAN, LTE, GSM call flows, Mobile Packet Core call flows, and roaming scenarios
• Familiarity with telecommunications technologies and ITU/ETSI standards
• Upper-intermediate (B2) English proficiency or higher
• Willingness and ability to travel internationally as required
• Experience with the Cellusys Steering of Roaming platform is an advantage
• Experience with 5G networks and/or VoLTE/IMS is an advantage
• Good operational knowledge of Linux is an advantage
• Knowledge of Docker is an advantage
• Knowledge of IT tools such as Splunk and Python is an advantage
• High degree of initiative, autonomy, and commitment
• Ability to work effectively in an international and multicultural environment
• Proactive, self-driven approach with ability to identify and resolve issues independently
• Ability to work independently and as part of a team
• Ability to work effectively under pressure, stay organized, and manage multiple projects
• Ability to adjust priorities based on ad hoc requests
• Results-oriented and customer-focused approach
• Background checks required for all final candidates

• Flexible hybrid work model
• Professional growth opportunities
• Meaningful projects
• Open culture
• Outstanding work-life balance
• Flexible working arrangements
• Learning and development culture
• Opportunity to contribute to a growing, fast-developing sector
• International travel opportunities as required