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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.