Information Technology Operations Engineer

Technology Operation Engineer

IN&VAS Engineering

Department: Technology Operation / IN&VAS Engineering

Reports To: Senior Technology Operations Manager

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.

Key Responsibilities

Operations & Maintenance

• 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 use cases such as 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 export to external systems like Notifiation application and 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.

Project & Change Management

• Participate in upgrades, migrations, capacity expansions, and new node integrations.
• Prepare MOPs, perform impact analysis, and execute changes during maintenance windows.
• Conduct end-to-end testing and acceptance of new services.

Customer Complaint Resolution

• Investigate and resolve customer complaints related to charging, offers, data policy, SMS, voice quality, SIM/eSIM, and vouchers within defined SLAs.
• Perform RCA, implement permanent fixes, and coordinate with customer care, IT, and the host MNO.

Regulatory & Compliance

• Ensure full compliance with regulatory requirements covering charging accuracy, SIM KYC, A2P SMS, lawful interception, and data privacy.
• Submit timely regulatory reports and support internal/external audits.
• Implement mandated regulatory changes promptly.

Performance, Documentation & Support

• Monitor KPIs (charging accuracy, policy enforcement, SMS delivery, call quality, SIM activation, voucher redemption).
• Maintain network documentation, configuration records, tariff/offer catalogs, and RCAs.
• Provide L2/L3 support to NOC, customer care, IT, and revenue assurance teams; collaborate with vendors for escalations.

Qualifications

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.

Technical Skills

• 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, AudioCodes).
• Proficient in Linux/Unix , shell scripting, and databases (Oracle, MySQL).
• Strong understanding of API integration (REST, SOAP, Kafka, ESB) with IT systems.
• Familiarity with NFV, cloud-native VAS, and monitoring tools (Zabbix, Grafana, ELK) is a plus.

Soft Skills

• Strong analytical, problem-solving, and stakeholder management skills.
• Customer-focused with attention to detail; able to work under pressure and on-call rotations.

Preferred Qualifications

• Vendor certifications (Huawei, Ericsson, Nokia, Oracle Communications).
• Experience with 5G CCS/PCF , GSMA eSIM/RSP, SMS firewall, and automation (Python, DevOps).

Working Conditions

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

Key Performance Indicators (KPIs)

• Platform availability ≥ 99.9% and SLA compliance for incidents and complaints.
• Timely launch of tariffs, offers, and promotions with full charging accuracy.
• PCRF policy enforcement success and data session quality.
• SMS delivery success and A2P partner SLA compliance.
• Successful SIM/eSIM activation, voucher redemption, and VoLTE call quality (MOS, ASR, NER).
• Full regulatory compliance and effective host MNO/IT integration.