L2 CS/VAS Engineer

As an L2 CS/VAS Engineer, you will play a critical role in managing and supporting IOTA Core CS networks, troubleshooting complex issues, and ensuring seamless integration of new services for global customers. You will collaborate with cross-functional teams, provide advanced technical support, and contribute to process improvements to deliver high-quality services within agreed SLAs. Your work will directly impact customer satisfaction and service excellence.

Key Responsibilities

• Manage the IOTA Core CS networks ensuring high availability and performance.
• Troubleshoot and resolve issues on Core CS nodes including HLR/HLR-FW, HSS/HSS-FE, CUDB, STP, DEA/DSC/DRA.
• Troubleshoot and resolve issues on VAS nodes including: SMSC, Location Based Services,
• Provide technical support to sales, marketing, project managers, and customers, including pre-sales activities and supervision of core network implementations.
• Develop, manage, and implement automation scripts to streamline operations.
• Verify and support configuration change implementations.
• Analyze risk and assess impact of new service integrations or design changes.
• Coordinate with L1 support, Engineering, and other teams to resolve complex technical issues.
• Deliver remote support and troubleshooting for integration engineers, customers, and third-party partners.
• Create, review, and update processes and procedures for new configurations or common issue fixes.
• Actively participate in problem management processes when required.
• Provide 24x7 on-call support, when needed, to assist the L1 team.
• Coordinate, support, and execute proactive and reactive maintenance activities to ensure service quality within SLAs.
• Prepare and deliver KPI reports and dashboards to track performance.

Minimum Requirements

• Bachelor’s degree in Telecommunications, Computer Information Systems, or related field.
• 3 to 5 years of experience in the Telecom Core Network domain.
• Solid knowledge of mobile telecom networks and signaling.
• Good understanding of IP networking principles (experience in IP networking is a plus).
• Proven hands-on experience and strong understanding of at least one of the following technical areas (multiple areas strongly preferred):
• • Core CS: MSC/MSC Server, STP, HLR/HLR-FE, CUDB, HSS/HSS-FE, DEA/DRA/DSC, APG 43/43L, IMS, Protocol Analyzer, SS7, SIGTRAN, Diameter, SIP, VoLTE, CCDM, 5G Core.
  • VAS: SMSC, SMPP, SMS over SGd/IMS, Location Based Services (3G & 4G).
  • Tools: OSIX
• Experience with Ericsson products (STP, HLR/HLR-FE, CUDB, HSS/HSS-FE, DEA/DRA/DSC) is a plus.
• Good knowledge of Linux; Google Cloud, OpenStack, and Kubernetes experience is a plus.
• Scripting skills (Python, Bash) are a plus.
• Availability for on-call rotations.
• Proficiency in English.

Preferred Skills

• Quick reaction times with strong problem-solving capabilities.
• Excellent communication and collaboration skills in multicultural teams.
• Perseverance and strong documentation skills.
• Practical mindset with a focus on advising, helping, and developing others.
• Tact, diplomacy, ambition, and self-confidence.
• Strong analytical and technical thinking abilities.