{"id":3049023,"url":"https://alion.io/job/marsh-mclennan-l3-network-security-operations-engineer","title":"L3 Network & Security Operations Engineer","company":{"id":1769686,"name":"Marsh McLennan","domain":"marshmclennan.com","url":"https://alion.io/company/marshmclennan","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"B","score":80,"open_postings":73,"ghost_share":0,"stale_share":0.986,"repost_share":0,"time_to_fill_p50_days":12,"computed_at":"2026-10-24T06:02:35Z"}},"role":"Security","role_family":"Security","seniority":null,"employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Cluj-Napoca, Romania"],"countries":["RO"],"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":"AWS","optional":false},{"name":"ITIL","optional":false},{"name":"ITSM","optional":false},{"name":"Layer 2","optional":false},{"name":"PowerShell","optional":false},{"name":"Python","optional":false},{"name":"Zero Trust","optional":false},{"name":"Zscaler","optional":false}],"status":"live","first_seen_at":"2026-09-11T00:00:00Z","employer_posted_date":"2026-09-11","last_verified_at":"2026-10-24T08:01:59Z","board_verified":true,"closed_at":null,"days_open":43,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":43},"description":"Company:\nMarshDescription:\nWe are seeking a talented individual to join ourNetwork and Security Operations team, part of Marsh.\nThis role will be based inCluj-Napoca. This is ahybrid role that has a requirement of working at leastthree days a week in the office.\nAs L3 Network & Security Operations Engineer you will act as a senior escalation point for complex network incidents and changes. This is an operational, delivery-focused role (troubleshooting, remediation, and implementation) with a strong emphasis on modern load balancing (F5 Distributed Cloud and AWS ALB/NLB), plus WAN and branch connectivity.\nYou will join a combined Network and Security Operations team that supports end-to-end user-to-application flows across the network and security control path. The position is primarily network-operations focused, with clear exposure and progression into security operations toolsets if desired.\nWorking pattern\nHybrid working model with an expectation of time in the office and time working from home\n\nStandard business hours, Monday to Friday\n\nGlobal follow-the-sun support model across EMEA, APAC, and the Americas, with structured handovers between regions\n\nWeekend on-call rota for major incidents only; shared across the full team with each person covering one weekend per rotation cycle\n\nWe will count on you to:\nProvideL3 escalation support for major incidents, leading technical triage, restoration activities, and clear stakeholder communication\n\nOperate, troubleshoot, and implementload balancing services, with a primary focus on F5 Distributed Cloud (XC) and AWS Elastic Load Balancing (ALB/NLB)\n\nManageTLS/SSL enablement across load balancers and, where required, firewalls/WAFs, including certificate installation, chain management, binding, renewal, rotation, and end-to-end validation\n\nSupportSD-WAN, WAN, and branch connectivity services, including troubleshooting routing, pathing, carrier issues, and branch LAN/WLAN environments\n\nDeliver network changes safely and effectively throughITIL-aligned governance, including planning, risk assessment, validation, and rollback readiness\n\nProduce high-quality operational documentation, ITSM updates, and closure notes to improve repeatability and reduce mean time to resolution\n\nSupport legacyF5 BIG-IP services as required during transition to cloud/distributed platforms\n\nContribute to the team’s broader operational capability, with opportunities to gain exposure to firewall, WAF, cloud security controls, Zero Trust, and microsegmentation technologies\n\n Growth & development (security operations pathway)\nOpportunity to develop hands-on experience with firewall and WAF implementations where traffic flows require termination/inspection and policy troubleshooting\n\nExposure to cloud security controls and segmentation (e.g., security groups and cloud-native access patterns) as part of end-to-end flow support\n\nOption to broaden into Zero Trust and microsegmentation technologies used by the team (e.g., Zscaler, Elisity, Illumio), depending on interest and team needs\n\nWhat you need to have:\nProvenL3 Network Operations experience as a senior escalation resource in aNOC/operations environment.\n\nStrong troubleshooting capability acrossL2-L7, includingTCP/TLS and HTTP/HTTPS, with a structured and methodical approach to fault isolation and remediation\n\nHands-on experience withcloud/distributed load balancing, includingF5 Distributed Cloud and/or AWS ALB/NLB\n\nPractical experience deploying and managingCA-provided certificates, including import/install, chain management, binding/configuration, renewal/rotation, and post-change validation\n\nSolid experience with Cisco multilayer switching (Layer 2 / Layer 3), including configuration and troubleshooting of VLANs, SVIs, routing, and high-availability concepts\n\nSolid experience troubleshootingWAN and branch connectivity, including working with carriers and vendors during outages\n\nStrong change management discipline within anITIL framework, including Incident, Problem, and Change processes\n\nWhat makes you stand out?\nOperational experience with legacy F5 BIG-IP (LTM) and/or migration activities to cloud/distributed load balancing platforms.\n\nFamiliarity withfirewall and WAF implementations, especially where TLS termination or inspection affects traffic flows.\n\nExperience with Prisma SD-WAN (CloudGenix), Aviatrix, Aruba Central, and/or Juniper Mist.\n\nScripting or automation experience usingPowerShell and/orPython to improve operational efficiency.\n\nWhy join our team:\nWe help you be your best through professional development opportunities, interesting work, and supportive leaders;\n\nWe foster a vibrant and inclusive culture where you can work with talented colleagues to create new solutions and have an impact for colleagues, clients, and communities;\n\nOur scale enables us to provide a range of career opportunities, as well as benefits and rewards to enhance your well-being;\n\nA yearly budget and the opportunity to build your flexible benefits package (up to 20% of your annual salary);\n\n30+ days off (including legal days, birthday, public holiday replacements, and benefits options);\n\nPerformance bonus scheme;\n\nMatching charity contributions, charity days off, and thePay it Forward charity challenge;\n\nCore benefits: Pension, Life and Medical Insurance, Meal Vouchers, Travel Insurance.\n\nMarsh (NYSE: MRSH) is a global leader in risk, reinsurance and capital, people and investments, and management consulting, advising clients in 130 countries. With annual revenue of over $27 billion and more than 95,000 colleagues, Marsh helps build the confidence to thrive through the power of perspective. For more information, visit marsh.com, or follow us on LinkedIn and X.Marsh is committed to creating a diverse, inclusive and flexible work environment. We aim to attract and retain the best people and embrace diversity of age, background, disability, ethnic origin, family duties, gender orientation or expression, marital status, nationality, parental status, personal or social status, political affiliation, race, religion and beliefs, sex/gender, sexual orientation or expression, skin color, or any other characteristic protected by applicable law.Marsh is committed to hybrid work, which includes the flexibility of working remotely and the collaboration, connections and professional development benefits of working together in the office. All Marsh colleagues are expected to be in their local office or working onsite with clients at least three days per week. Office-based teams will identify at least one “anchor day” per week on which their full team will be together in person.","description_format":"text","description_chars":6643,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Flexible schedule","Health insurance","Hybrid work","Professional development"],"hiring_locations":[{"name":"Romania","iso":"RO","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-10-22T01:45:38Z"}],"visa":[],"liveness":{"score":4,"band":"cold","label":"Long shot","p_open":1,"p_active":0.145,"p_room":0.28,"age_days":43,"expected_fill_days":12,"reasons":["conf:0","stale_co","velocity","win:tail","crowd:brand"],"computed_at":"2026-10-24T06:02:35Z"},"pay":null,"html_url":"https://alion.io/job/marsh-mclennan-l3-network-security-operations-engineer","json_url":"https://alion.io/job/marsh-mclennan-l3-network-security-operations-engineer.json","meta":{"generated_at":"2026-10-24T10:01:40Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":14523,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-25T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":1769686},"rest":"https://alion.io/mcp/rest/get_company?id=1769686"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fmarsh-mclennan-l3-network-security-operations-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fmarsh-mclennan-l3-network-security-operations-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fmarsh-mclennan-l3-network-security-operations-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/marsh-mclennan-l3-network-security-operations-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fmarsh-mclennan-l3-network-security-operations-engineer"}]}