Senior Roaming Operations Engineer

• Provide second-line support for Instant Roaming, Open-Connectivity Roaming, 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 execute planned maintenance work
• Participate in new service implementations and network rollout projects with engineering teams
• Collaborate with Product Management, Presales, and second-line customer support teams to gather logs and traces, validate routing and data transfer, and maintain service quality
• Work with vendors, monitor performance, and ensure proper service delivery
• Support customers worldwide with roaming-related issues and cooperate with mobile operators and Travel SIM companies
• Apply knowledge of network architecture, signaling protocols, and interfaces
• Assist with training new and existing team members
• Support workload planning for business continuity during holiday periods
• Participate in an on-call rotation of 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 Splunk and Python is an advantage
• Ability to work effectively in an international and multicultural environment
• Ability to work independently and as part of a team
• Ability to work effectively under pressure and manage multiple projects
• Background checks required for all final candidates

• Professional growth
• Meaningful projects
• Open culture
• Outstanding work-life balance
• Flexible hybrid work model
• Learning and development culture focused on continuous curiosity, unlearning, and relearning
• International travel opportunities as required