Senior Network Operations Engineer (VoIP & Security)

TenacIT is seeking an experienced Senior Network & VoIP Operations Engineer to join our Gqeberha-based engineering team.This is a senior technical role suited to an engineer with strong experience across network operations, VoIP infrastructure, troubleshooting, security, and escalated incident management within a fast-paced service provider or managed services environment.You will play a key role in maintaining, supporting, and evolving critical network and voice infrastructure across multiple client and internal environments. The role offers exposure to complex routing, VoIP systems, VPN technologies, enterprise client infrastructure, automation initiatives, and large-scale technical project work.This position is ideal for someone who enjoys deep technical troubleshooting, takes ownership of operational outcomes, and wants meaningful involvement in both day-to-day engineering and long-term infrastructure improvement.Key ResponsibilitiesNetwork OperationsProvide senior-level network support across multiple environmentsTroubleshoot and resolve escalated network incidents and complex connectivity issuesMonitor, maintain, and optimise network performance, reliability, and availabilitySupport enterprise client network environments across multiple technologies and deploymentsAssist with infrastructure optimisation, resilience planning, and operational improvementVoIP & Telephony InfrastructureMonitor and maintain VoIP platforms across physical and virtual environmentsInvestigate call quality issues, latency, jitter, packet loss, and performance-related incidentsTroubleshoot SIP, voice routing, and telephony-related faultsSupport provisioning, maintenance, and ongoing optimisation of VoIP systemsContribute to VoIP-related R&D, platform enhancements, and performance improvementsSecurity & ConnectivityConfigure, maintain, and troubleshoot firewall and perimeter security solutionsSupport VPN technologies, including secure client connectivity and site-to-site environmentsAssist with security hardening, network protection, and secure infrastructure designMaintain secure and stable connectivity across internal and client environmentsIncident Management & EscalationsManage escalated incidents through to resolutionPerform root cause analysis on recurring technical issues and service-impacting eventsLead investigations into network and voice-related incidents and trendsSupport SLA-driven operational delivery with a strong focus on quality and client outcomesProjects, Automation & LeadershipAct as a senior technical resource on infrastructure and implementation projectsContribute to automation, tooling, and operational efficiency initiativesSupport continuous improvement across network and VoIP environmentsMentor junior engineers and provide technical guidance where requiredCollaborate with cross-functional teams on infrastructure upgrades and strategic initiativesTechnical Experience RequiredStrong hands-on experience in:Network Operations & TroubleshootingRouting & SwitchingVoIP Systems & Telephony TroubleshootingSIP & Call Quality InvestigationVPN TechnologiesFirewall Administration & Network SecurityIncident Management & Escalation HandlingEnterprise Networking EnvironmentsInfrastructure Monitoring & Performance AnalysisTroubleshooting across complex multi-site or multi-client environmentsAdvantageous ExperienceExperience with any of the following would be highly beneficial:Cisco technologiesMikroTik environmentsWireGuard VPNLinux server administrationDocker environmentsNetwork automation or scriptingISP, MSP, MSSP, or carrier/service provider environmentsVoIP platform optimisation and performance tuningRequirementsQualificationsRelevant tertiary qualification in Information Technology, Networking, Telecommunications, or similar preferredRelevant networking or vendor certifications are advantageous (Cisco, MikroTik, VoIP, Security)Experience5+ years in a network engineering, VoIP engineering, or infrastructure operations roleStrong experience in network troubleshooting and operational supportExperience managing escalated incidents and complex technical investigationsExperience supporting enterprise or service provider environments preferredExposure to project implementation and infrastructure improvement initiativesAbout YouYou’ll likely thrive in this role if you:Have a strong troubleshooting and analytical mindsetEnjoy solving complex network and voice-related technical problemsWork confidently under pressure in a high-availability environmentTake ownership of incidents from investigation through to resolutionCommunicate effectively with both technical teams and clientsAre proactive, detail-oriented, and solutions-drivenEnjoy mentoring junior engineers and sharing technical knowledgeHave a passion for infrastructure optimisation, automation, and continuous improvementWhat We OfferExposure to complex enterprise-scale network and VoIP environmentsOpportunity to work on mission-critical infrastructure across diverse environmentsTechnical ownership within a highly skilled engineering teamInvolvement in project delivery, automation, and infrastructure improvement initiativesOpportunities to grow into broader technical leadership and project ownershipCompetitive market-related remuneration aligned to experience, technical capability, and overall fit for the roleBenefitsOld Mutual Umbrella FundMomentum Medical InsuranceBring Your Own Device allowance / supportHome internet line benefitAbout TenacITTenacIT is an MSP, MSSP, and Enterprise ISP delivering tailored ICT solutions across networking, security, cloud, software development, and voice.With a national footprint, we support businesses across diverse industries through secure infrastructure, innovative technology, and high-performance managed services. Our engineering teams work across networking, security, VoIP, and enterprise infrastructure with a strong focus on reliability, innovation, and continuous improvement.LocationThis is a full-time, in-office role based in Gqeberha.