Technology Operation Engineer

Job Summary

The Technology Operation Engineer is responsible for the design, deployment, operation, and maintenance of Intelligent Network (IN) and Value-Added Services (VAS) platforms including OCS, PCRF, STP, SBC, SMSC, SIM/eSIM management and Voucher Management Systems (VMS). The role ensures high availability, charging accuracy, and seamless integration with the Host MNO, A2P SMS partners, and IT applications BCRM, Billing, Mediation, Self‑Care, while ensuring full regulatory compliance and timely customer complaint resolution.

• Operate, monitor, and maintain IN & VAS OCS PCRF STP SBC SMSC IVR SIM eSIM and VMS platforms; perform health checks, preventive maintenance, backups, and incident resolution within SLA; manage alarms, traces and logs to proactively detect service-impacting issues.
• Plan and execute system upgrades, patches and security fixes in close coordination with vendor system support teams, ensuring proper testing, rollback plans, and minimal service impact during maintenance windows.
• OCS Rating:
  Tariffs, Offers & Promotions – operate and configure the Online Charging System for real-time prepaid converged charging; define rating logic, tariff plans, rate tables, and zone time‑based charges for voice, SMS, data, and roaming.
• Design and manage offers, bundles, add‑ons, promotions, loyalty rewards, and recharge bonuses; configure service classes, accumulators, counters, and Diameter Gy, Gx, Rx interfaces; ensure charging accuracy and zero revenue leakage; support CDR/EDR analysis and dispute resolution.
• PCRF Policy Control – configure and maintain PCRF/PCF policies for QoS, FUP, throttling and service‑based control; manage Gx, Gy, Rx, Sy, Sd interfaces with PGW, OCS, and IMS; implement zero‑rated services, sponsored data and dynamic QoS.
• SMSC & A2P Partner Management – operate and maintain the SMSC for P2P, A2P and MO/MT messaging; onboard and manage A2P partners and aggregators via SMPP binds, throttling, routing, whitelisting; implement SMS firewall policies to block grey routes, spam and smishing; ensure A2P revenue protection, partner SLA compliance and SMS KPI monitoring.
• Signaling: STP & SBC – operate the STP system for SS7 SIGTRAN routing, manage point codes, linksets and GTT; operate SBC platforms for SIP, VoLTE, IMS security, codec handling, fraud prevention and call quality; coordinate signaling and SIP interconnection with the host MNO and external partners.
• SIM eSIM & Voucher Management – manage SIM eSIM OTA platforms for profile creation, provisioning and lifecycle operations; operate the Voucher Management System for voucher generation, distribution, redemption and reconciliation (including e-Top-Up integration).
• IT Applications Integration – integrate IN & VAS OCS PCRF SMSC SIM VMS platforms with BCRM Billing, Mediation, ERP, Self‑Care; maintain real‑time triggers and file exports to external systems such as Notification application and mediation systems, ensuring data consistency and transaction integrity.
• Host MNO Coordination – act as the technical focal point with the Host MNO for all IN & VAS signaling, charging, SMS and IMS matters; coordinate integration testing, change management and joint troubleshooting; manage technical SLAs, interface agreements and operational reviews with the host operator.

• Education & Experience:
  
  Bachelor’s Degree in Telecommunications, Electronics, or Computer Engineering; 3–5 years of hands‑on experience with IN & VAS, OCS, PCRF, STP, SBC, SMSC, IVR, SIM/eSIM, and VMS platforms.
• Experience with OCS rating/offer/promotion design, PCRF policy configuration, and A2P/SMPP partner integration.
• Prior experience coordinating with a Host MNO and integrating with IT systems (BCRM, Billing) is highly desirable.
• Strong expertise in IN architecture (OCS, OFCS, PCRF, PCF), SMSC, STP, SBC, SIM/eSIM, IVR, and VMS.
• Solid knowledge of SS7, SIGTRAN, Diameter (Gx, Gy, Rx, Sy, Sd), SIP, SMPP, MAP, CAP, INAP, RTP.
• Hands‑on experience with major vendors:
  Huawei, Ericsson, Nokia, ZTE, Oracle, Ribbon, Audio Codes.
• Proficient in Linux/Unix shell scripting and databases (Oracle, MySQL).
• Strong understanding of API integration: REST, SOAP, Kafka, ESB.
• Familiarity with NFV, cloud‑native VAS and monitoring tools (Zabbix, Grafana, ELK) is a plus.

• Vendor certifications in Huawei, Ericsson, Nokia, Oracle Communications.
• Experience with 5G CCs, PCF, GSMA eSIM RSP, SMS firewall and automation.
• Python, Dev Ops experience.

Office‑based with data center visits; 24/7 on-call rotation and flexibility for maintenance windows.