Job Description: PS Core Network EngineerJob SummaryWe are seeking a PS (Packet Switched) Core Network Engineer to operate, maintain, and optimize PS core networks across 2G, 3G, 4G, and 5G environments. The role covers daily operations, advanced troubleshooting, solution implementation, and network evolution activities, with responsibilities aligned to the engineers experience level.Experience LevelsEngineer: 3 YearsSenior Engineer: 5–8 YearsExpert / Lead Engineer: More than 8 YearsResponsibilities & Technical Requirements by Experience Level3 Years (PS Core Engineer)PS Core FundamentalsGood command of the basic knowledge of PS Core Network Elements (NEs)Basic understanding of common PS network protocols:TCP, UDP, NTP, DNS, ICMPBasic knowledge of IPv4 / IPv6 addressing, subnetting, and IP allocationNetwork Operations & ToolsProficient in basic troubleshooting tools:Ping, TracertAbility to collect information using NMS, NIC, and LMTPerform routine health checks and maintain operational scriptsMonitor network performance, system logs, and capacityMobility & Session ManagementUnderstanding of logical interfaces in 2G / 3G / 4G networksBasic knowledge of mobility and session management procedures:Attach, TAU, HandoverPDP establishment and session establishmentCloud & TroubleshootingGeneral knowledge of cloud concepts for physical and logical network structuresBasic alarm handling and troubleshootingAbility to enable traces and perform basic fault isolation5–8 Years (Senior PS Core Engineer)Advanced Troubleshooting & MaintenanceStrong capability in comprehensive troubleshooting and routine PS core maintenanceSolid understanding of IPv4 networking and subnettingExpertise in trace capture and analysis tools:PCAP, TraceviewProficient with FMA for traffic statistics, alarms, operation logs, and CHR analysisMobility, Interfaces & ServicesStrong command of mobility and session management:Attach, TAU, Handover, PDP setup, session setupRegistration, inter-RAT interworkingUser authentication, NE selection, QoS principlesKnowledge of interface signaling tracing and analysis:Ga, Gn, Iu, Gr, Gb, S1-MME, S1-U, S5, S8, SGi, Gx, GyPS Core ImplementationHands-on experience with 2G / 3G / 4G PS service implementations:SGSN/MME poolingAddress pool allocationCSFBExperience with simple PCC services and charging schemesO&M & KPIsStrong routine O&M capabilities:Message tracing, alarm analysis, performance monitoringExperience with patching, upgrades, part replacement, and capacity expansionKnowledge of NSA and SA architectures and 5G solutionsAbility to analyze 3G / 4G / 5G KPIs and counters and troubleshoot KPI degradationExperience with licenses, patches, certificates, and KPI systemsMore Than 8 Years (Expert / Lead PS Core Engineer)Architecture, Planning & OptimizationStrong expertise in solution design, network planning, service solution planning, and optimizationDeep understanding of QoS principles and IPSec architectureAdvanced Troubleshooting & AnalysisExpert-level use of tools:Wireshark, TranExpert, FMAAbility to analyze and resolve complex service quality issues based on signalingAdvanced signaling tracing and analysis across all PS interfacesCharging, DPI & VoLTEExpert knowledge of:Online and offline charging commissioningDPI and content-based charging configurationPCC data planning and configurationStrong understanding of end-to-end VoLTE processes, with PS-side expertiseScalability & Cloud ArchitectureExpertise in board and VM scaling methodsStrong command of CUPS architecture and principlesExperience with complex networking solutions:2G/3G/4G horizontal service redundancyMME chain backup, VoLTE, NB-IoTIPSec / GRE / L2TPEvolution & Complex OperationsAdvanced signaling and KPI analysis for horizontal servicesExpertise in IP packet analysis, complex upgrades, capacity expansion, and network reconstructionStrong understanding of PS network concepts, procedures, and configurationsAbility to understand customer requirements and translate them into end-to-end technical solutionsGeneral Competencies (All Levels)Strong analytical and troubleshooting skillsExperience working on live telecom networksClear documentation and reporting skillsAbility to work independently and within cross-functional teams