{"id":3451587,"url":"https://alion.io/job/ntt-data-l3-network-security-engineer","title":"L3 Network Security Engineer","company":{"id":50348,"name":"NTT DATA","domain":"nttdata.com","url":"https://alion.io/company/ntt-data","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Phenom","truth_index":{"grade":"A","score":95,"open_postings":101,"ghost_share":0,"stale_share":0.386,"repost_share":0,"time_to_fill_p50_days":17,"computed_at":"2026-10-30T05:48:23Z"}},"role":"Security","role_family":"Security","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":["Singapore"],"countries":["SG"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":8000,"max":10000,"currency":"SGD","period":"month","gross":true,"usd_annual":93564},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Ansible","optional":false},{"name":"DHCP","optional":false},{"name":"DNS","optional":false},{"name":"Python","optional":false},{"name":"AWS","optional":true},{"name":"Azure","optional":true},{"name":"CI/CD","optional":true},{"name":"GCP","optional":true},{"name":"Zero Trust","optional":true}],"status":"live","first_seen_at":"2026-10-29T00:00:00Z","employer_posted_date":null,"last_verified_at":"2026-10-29T00:00:00Z","board_verified":false,"closed_at":null,"days_open":2,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":2},"description":"About the Role\nWe are seeking an experienced L3 Network Security Engineer to our Infrastructure and Cybersecurity team. The successful candidate will be responsible for the design, implementation, optimization, automation, and operational support of enterprise network and security infrastructure across mission-critical environments. This role requires deep technical expertise in network security technologies and a strong focus on infrastructure automation.\nKey ResponsibilitiesProvide Level 3 technical support for complex network and security incidents, ensuring high availability and performance of enterprise infrastructure.\nDesign, implement, and maintain large-scale network security solutions across data center, campus, and cloud environments.\nManage and support security platforms including: Cisco (Routing, Switching, ACI, SD-WAN) Palo Alto Networks Firewalls Check Point Firewalls Fortinet Security SolutionsF5 Load Balancers (LTM/GTM) Infoblox DDI (DNS, DHCP, IPAM)\nLead troubleshooting and root cause analysis for critical network and security issues.\nDevelop and implement automation solutions to improve operational efficiency and reduce manual processes.\nCreate automation scripts and workflows using Python, Ansible, and API integrations.\nCollaborate with cybersecurity, cloud, infrastructure, and application teams on security architecture reviews and project implementations.\nParticipate in infrastructure transformation initiatives, network modernization, and security enhancement projects.\nMaintain technical documentation, operational procedures, and network standards.\nRequired QualificationsBachelor's Degree in Computer Science, Information Technology, Engineering, or related discipline.\nMinimum 5 years of experience in enterprise network and security engineering.\nCCIE Certification\nStrong hands-on experience supporting and administering:Cisco Networking TechnologiesPalo Alto FirewallsCheck Point FirewallsFortinet FirewallsF5 Load BalancersInfoblox DDI Solutions\nExpertise in routing and switching protocols including:BGPOSPFEIGRPMPLSVLANsVPN Technologies\nProven experience in infrastructure automation using:PythonAnsibleREST APIsInfrastructure as Code (IaC)\nStrong understanding of network security principles, segmentation, firewall policies, and threat mitigation.\nExperience supporting highly available and mission-critical environments.\nExcellent troubleshooting, analytical, and problem-solving skills.\nPreferred Qualifications PCNSE, CCNP Security, Check Point CCSA/CCSE, NSE4/NSE7, or F5 certifications\nExperience with cloud networking and security (AWS, Azure, GCP)\nKnowledge of SASE, Zero Trust Architecture, SD-WAN, and Network Access Control (NAC)\nExperience in financial services, banking, or regulated enterprise environments\nExposure to DevOps and CI/CD practices\nSkills\nWorkflow Automation, Lead Management, Enterprise IT Infrastructure, CCIE, firewall software, Infrastructure Upgrades, Computer Science, Infrastructure Automation, Mission Critical Systems, Analytical and Problem-Solving Skills, Cybersecurity, Routing Protocols, Data Center Management, Automation Strategy, Ansible, Network 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