{"id":3942201,"url":"https://alion.io/job/job-crystal-senior-network-engineer-isp-core","title":"Senior Network Engineer (ISP Core)","company":{"id":702781,"name":"Job Crystal","domain":"jobcrystal.com","url":"https://alion.io/company/job-crystal","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":true,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Networking","role_family":"Networking","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Midrand, South Africa"],"countries":["ZA"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"BGP","optional":false},{"name":"OSPF","optional":false},{"name":"TCP/IP","optional":false}],"status":"live","first_seen_at":"2026-11-03T10:08:03Z","employer_posted_date":null,"last_verified_at":"2026-11-03T10:08:03Z","board_verified":false,"closed_at":null,"days_open":6,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":6},"description":"Job Intro\nSenior Network Engineer (ISP Core) - Midrand, GP Gauteng\n\neNetworks a division of Datacentrix is looking for a Senior Network Engineer with 5+ years experience in ISP industry to be based at the Midrand offices. The candidate will be required to monitor, maintain, secure and develop local and national core network as well as access/client networks. Mentor a team of engineers to troubleshoot and optimize the network for our customers. Must have excellent problem-solving skills and thorough knowledge of network administration and architecture. The Senior Network Engineer goal will be to establish networks that cater to high-uptime customer needs.\nJob Specification\n\nQualifications:\n\nMatric qualification\n\nTertiary qualification (Computer Science or IT related)\n\nCertifications CCNA, CCNP, JNCIA\n\nValid Driver’s License and own vehicle\n\nExperience:\nOffer\n\nMust have professional OME certification, working knowledge and experience of 5+ years\n\nSolid background in network administration and architecture\n\nIn-depth understanding of TCPIP and the network stack: IPv6, IPv4, routing protocols (e.g. BGP, OSPF), Q-in-Q\n\nExperience with network diagnostic, monitoring and analysis tools (NMS)\n\nSolid understanding of network operating systems (JUNOS, Cisco IOS, Mikrotik)\n\nMust be able to communicate at a business level with IT Directors, IT staff and general users from our client base\n\nIndustry-related experience as a Senior Network Engineer\n\nHave working practical knowledge of Data Centre Environments\n\nHave ISP industry working experience for 5+ years\n\nBe able to communicate and understand client requirements.\n\nResponsibilities:\n\nProactively monitor network performance and integrity\n\nImprove network performance, capacity and scalability\n\nFinal escalation tier for network engineers\n\nConfigure and install software, servers, routers and other network devices\n\nDesign and deploy functional networks through Pre and After Sales Support\n\nProduct research and development\n\nAutomate tasks and monitor their effectiveness\n\nMaintain complete technical documentation\n\nMentor team members on technical issues\n\nLiaise with various 3rd parties to ensure call resolution\n\nLiaise with project management and support teams\n\nWill be part of an after-hours standby rotation cycle\n\nMonthly Salary: Market 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