Senior Network & Security Engineer Blue Mantis United States, Hampshire, Portsmouth 2 International Dr Suite #260 (Show on map) Aug 20, 2026 We are seeking a Network Security Engineer to provide technical support in design and deployment of Network Transformation and Network Operations. In this role, you will assess and deploy the relevant technology solutions according to customers' business, security policy and application requirements and work directly with the Senior Network Engineer. Department Blue Mantis Employment Type Full Time Location Hybrid Workplace type Hybrid Key Responsibilities Participate in daily network, firewall, and operational support. Ability to troubleshoot network issues and failures and follow best practices and troubleshooting methodology to quickly assess current situations, find solutions, and implement changes to correct and/or update network topologies to ensure stability and functionality. Provide technical analysis of operational issues and remediations during troubleshooting efforts to ensure documentations and procedures are followed and updated during active events. This includes the ability to report to management. Stay up to date on emerging technologies and products, including attaining certifications and participation in industry events as appropriate. Work with various stake holders to lead problem solving, evolve system roadmap and take critical decisions. Provide clear communication with regular updates/reports to the management team. Additional/ Non-Essential Responsibilities Minimum of 5 years' experience in deployment and configuration and architectural design of networking technologies specific to routing, switching and general network security best practices, in which 3 years must be in customer-facing positions. Experience working for or with local government, service providers, and/or enterprises customers. Experience in large Data Center or Enterprise/campus designs, architecture, deployment and configuration with physical and virtual appliances. Familiarity with applications driving modern infrastructure design in private and public cloud. Experience in networking technologies such as STP, Nexus v

PC, IPSEC

/

SSLVPN, Routing:

VRF, MPLS, OSPF, BGP and Multi-Homed environments. Datacenter Network services including Security, Load Balancing, DNS, etc. at the virtual and physical level. Experience with Cisco, Juniper, Fortinet, HP, Aruba and CATO products (Firewall, Routing / switching, SASE, wireless and security) Wireless networking technologies including access-control platforms such as Cisco ISE or Aruba Clear Pass Policy Manager IPS/IDS, as well as other NGFW (Next Gen Firewall) features and capabilities. Ability to write incident and problem record documentation to support daily efforts. Strong analytical thinking and decision-making skills & highly organized. Strong ability to influence others and build consensus via excellent verbal and written communication skills. Skills, Knowledge and Expertise Minimum of CCNA or comparable level of knowledge. Ability to work on call rotation as needed.

B.S./B.A./M.S.

degree or equivalent technical training. Fortinet NSE 6 and NSE 7 Knowledge of Azure and AWS Experience with Aruba ClearPass, Aruba switches and wireless Experience with Cisco Firepower Services and Palo Alto security services. Understanding of encryption and SSL/TLS technologies and best practices. About Blue Mantis Blue Mantis is a leading strategic digital technology services provider with a 30+ year history of successfully helping clients achieve business modernization by applying next-generation technologies including managed services, cybersecurity and cloud. Headquartered in Portsmouth, Hampshire, the company provides digital technology services and strategic guidance to ensure clients quickly adapt and grow through automation and innovation. Blue Mantis partners with more than 1,200 leading mid-market and enterprise organizations in a multitude of vertical industries and is backed by leading private equity firm Recognize. Apply Now