Carolyne Siboe

Core Responsibilities

Cloud Network Engineer II at Microsoft Corporation (2020-12 – Present)

Core Responsibilities

• Troubleshooting, testing, and performing DRI (Directly Responsible Individual) duties for 4G LTE and 5G networks.
• Responding to incidents by creating tickets, taking traces, and coordinating with vendors for resolution.
• Improved MCN service reliability by resolving IcM incidents, performing upgrades, and stabilizing KPI indicator availability.
• Enabled cost reductions through infrastructure decommissioning and modernization.
• Reviewed operational KPIs with Nokia CMU and implemented corrective actions to eliminate inefficiencies.
• Support maintenance scheduling tools and stability validation for MCN dashboards.
• Optimizing MCN services (LTE, VoLTE, 5G NSA/SA) to ensure high speed and improved performance.
• Performing software upgrades on various network nodes, including Nokia RAN/Packet Core, Meta Switch IMS, and Azure Mobile Core, to fix bugs and support new features.
• Monitoring daily S360 KPIs and addressing outstanding security issues to maintain compliance with Microsoft standards.
• Conducting assessments like SDL, 1CS Privacy, and BCDR to mitigate risks.
• Strengthened security posture by validating and securing MCN credentials via Azure Key Vault and Safe Secrets.
• Ensured compliance during server migrations and governance renewals.
• Mitigated operational risks through improved secret-management practices and Azure Arc automation validation.
• Supporting automation projects and onboarding the MCN network to standard Microsoft tooling.
• Addressing customer complaints/issues and assisting with the design, deployment, and testing of new projects.
• Enhancing documentation through the DEP program, updating service architectures, and managing content in Engineering hub.
• Performing scrum master roles for the MCN and CellDAS teams, leading various agile meetings (stand-ups, backlog grooming, sprint reviews/planning).
• Renewing governance IDs and performing SSPA assessments for third-party software like Nokia NetAct and VMware to mitigate risk.
• Partnered with DI team to demo AI integration benefits for MCN, including Power BI Copilot and Data Agent features.
• Developed MCN Power BI dashboard analyzing one year of customer chargeback data.
• Used AI to generate summaries, identify usage trends, and perform natural-language data queries.
• Reduced manual analysis time through AI-driven insights and automated reporting.
• Enabled next-generation performance through Nokia CMU upgrades, 5G Core integration, LTE/5G migrations.
• Achieve zero customer complaints during migration and connectivity improvements.
• Conduct pre-checks and validation for Nokia NetAct SNMP activation; Prepared and finalized EDMT device-type onboarding documents ensuring compliance with standards.
• Support MCN migration from legacy systems to new servers, improving performance and reliability.
• Onboarded MCN Network ICM Monitor and transitioned monitoring from PRTG to Microsoft-aligned solutions.
• Modernized MCN monitoring and alerting by aligning IcM practices with IES standards.
• Monitored Azure Arc automation executions and resolved IDL query failures post-implementation.
• Conduct device audits for MLS Lab Optimization EOL Capacity Project.
• Validate lab device lifecycle status and ensure compliance with SDL requirements.
• Complete MCN inventory checks and capacity planning to maintain resource health.

Deployment Engineer at Nokia (2019-06 – 2020-12)

• Deployment of packet core VNFs (AMF, MME), DNS using CBIS for T-Mobile Network.
• Maintenance, Monitoring and troubleshooting of packet core nodes (AMF, MME) for T-Mobile Network.
• Preparation of upgrade and integration MOPs.
• Performed Software upgrades and patch installation on the packet core nodes.
• Implementation of new features through integration and configuration of the packet core VNFs.
• AcceptanceTesting and Validation on packet core nodes (Regression and Sanity for LTE and 5GSA data network).
• Preparation of TOLs and Feature testing.
• Configure DNS related configuration to resolve AAA and CNAME records.

LTE/IMS Test and Validation Engineer at AT&T (2018-05 – 2018-11)

• Directed end-to-end testing operations as Test Lead, overseeing test case development, task delegation, and the strategic resolution of high-priority technical escalations.
• Authored and validated comprehensive service tests for VoLTE and IMS, ensuring high-quality network performance and seamless service delivery.
• Conducted deep-dive root cause analysis of complex call-flows by capturing and analyzing system traces and logs to resolve critical network issues.
• Managed the preparation of TOLS (Test Object Lists) and performed test subscriber provisioning within HSS and CTS environments.
• Leveraged advanced training in 5G Network Architecture to support next-generation network transitions and architectural reviews.

Cloud Packet Core/EPC Network Engineer at Huawei Technologies Ltd (2011-12 – 2018-01)

• Engineered High-Level (HLD) and Low-Level Designs (LLD) for PS/EPC and 5G network architectures, including IP planning, subnetting and data configuration for core nodes and switches.
• Led the end-to-end installation and commissioning of Packet Core nodes (SGSN, GGSN, MME, SGW, PGW, USN, UGW) and NFV elements (vMSE, vEPC).
• Managed complex multi-interface integrations (Gy, Gx, S1-MME, S6a, SGi, Rx, etc.) between packet core nodes and third-party systems.
• Directed daily O&M, including real-time alarm monitoring, deep-dive troubleshooting, performance reporting, and system-wide software upgrades for core elements, switches, routers and firewalls for NATs.
• Authored technical hardware/software acceptance documentation and spearheaded User Acceptance Testing (UAT) to ensure seamless client delivery.
• Mentored and trained new staff and interns on PS products, fostering technical growth and team efficiency.
• Orchestrated the consolidation and swap-out of legacy Ericsson nodes (SGSN, GGSN, eDNS) with modern Packet Core infrastructure (Airtel & Warid Consolidation, Uganda & Congo Republic, 2013-2015).
• Led the team in the successful implementation of SGSN/MME/PGW/SGW pooling for enhanced network reliability (Airtel Uganda PS DR Project, 2016).
• Served as Team Leader for the hardware installation and commissioning of PGW/SGW nodes to support 100G capacity (Safaricom 100GE Expansion, Kenya, 2016).
• Deployed EPC networks to support 4G/LTE, implementing full redundancy pooling for SGSN, MME, SGW, GGSN, DNS, and PGW (Orange & Vodacom DRC EPC Project, 2014).
• Executed software and hardware expansions for core nodes (SGSN/MME/SGW/PGW/CG) to enable NB-IoT and VoLTE readiness (Safaricom Packet Core Upgrade, Kenya, 2017-2018).
• Managed the commissioning and maintenance of NFV elements (vMSE and vEPC) and conducted NB-IoT lab testing (MTN South Africa vMSE/vEPC Cloud Project, 2016-2017).
• Provided specialized customer support including LLD design, IP planning, and commissioning of EPDG and PGW for VoWiFi services (MTC Namibia VoWiFi/VoLTE Project, 2017).
• Commissioned and integrated PCRF with PCEF, OCS, SMSC, and provisioning systems (Econet Leo PCRF Project, Burundi, 2015-2016).

B.Sc. in Mathematics (Statistics) and Computer Science – Jomo Kenyatta University of Agriculture and Technology (JKUAT) (2007 – 2011)

Master's in Cyber Security Engineering – University of Washington Bothell (2018 – 2023)