Network Security Engineer

Cognizant; Dartford; On-site; GBP 50,000 - 70,000; Full time

Job summary

A global technology leader is seeking a Network Security Engineer to design and manage secure networks across hybrid environments. The ideal candidate will have robust skills in Cisco and Palo Alto technologies, AWS networking, and excellent troubleshooting abilities. Join a team that values creativity and innovation in providing top-tier technology solutions. Competitive salary and career development opportunities offered.

Qualifications

• Solid foundation in core networking concepts including TCP/IP, VLANs, DNS, DHCP, and subnetting.
• Hands-on proficiency in Cisco Switching Technologies, expertise in Palo Alto Networks Firewalls.
• Extensive experience in AWS Networking and strong understanding of Wireless Networking.

Responsibilities

• Design and support scalable network architectures across hybrid environments.
• Implement and manage Cisco switching technologies for optimal performance.
• Maintain Palo Alto Networks Firewalls ensuring security policies compliance.
• Administer dynamic routing protocols for efficient traffic flow.
• Manage AWS networking components effectively.

Skills

Core networking concepts (TCP/IP, VLANs, DNS, DHCP, subnetting)

Cisco Switching Technologies

Palo Alto Networks Firewalls

Dynamic Routing Protocols (OSPF, BGP)

AWS Networking (Transit Gateways, ALB/NLB, Security Groups)

Wireless Networking with Meraki products

Troubleshooting skills

Automation skills

Education

Certifications preferred: CCNP, AWS Certified Advanced Networking, PCNSE

Job description

This is an excellent opportunity for Network Security Engineer professionals to be part of leading-edge technology projects. Cognizant’s Cloud, Infrastructure & Security Services Practice provides end-to-end solutions covering architecture, design, implementation, management, and on-going support across the entire enterprise technology infrastructure. Our services include a spectrum of management, consulting, and systems integration services to help our clients maximize value in their infrastructure resources, while optimizing infrastructure performance and cost.

Key Responsibilities

• Design, configure, and support scalable and secure enterprise network architectures across hybrid environments (on-premises and AWS Cloud).
• Implement and manage Cisco switching technologies and ensure optimal network performance and redundancy.
• Configure and maintain Palo Alto Networks Firewalls (both physical and virtual), ensuring proper security policies and compliance.
• Administer and optimize dynamic routing protocols such as OSPF and BGP for efficient network traffic flow.
• Manage AWS networking components, including Transit Gateways, VPC Attachments, Security Groups, Endpoints, GWLB, ALB, NLB, and WAF.
• Provide technical leadership in wireless technologies and oversee deployments using Meraki products.
• Identify and implement automation opportunities to reduce manual intervention and operational overhead in collaboration with automation teams.
• Troubleshoot complex network issues through strong analytical and logical reasoning skills to ensure minimum downtime.
• Develop, update, and maintain detailed network documentation, architecture diagrams, and configuration standards.
• Collaborate with cross-functional teams to support network integration, security, and performance initiatives.

Required Skills

• Solid foundation in core networking concepts including TCP/IP, VLANs, DNS, DHCP, and subnetting.
• Hands-on proficiency in Cisco Switching Technologies (Must).
• Expertise in Palo Alto Networks Firewalls (Must).
• Strong knowledge of Dynamic Routing Protocols – OSPF, BGP.
• Extensive experience in AWS Networking – Transit Gateways, ALB/NLB, Security Groups, Endpoints, GWLB, WAF (Must).
• Strong understanding of Wireless Networking, with hands-on experience using Meraki products.
• Excellent logical thinking and troubleshooting skills to resolve complex technical issues (Must).
• Proven automation skills to identify network improvement opportunities (Must).
• Certifications preferred: CCNP, AWS Certified Advanced Networking, PCNSE (Palo Alto), or equivalent.
  

At Cognizant you will experience an exciting mix of innovation by design, creativity, collaboration, and efficiency within a framework of stimulating objectives and a passion for delivering the best to our customers.

You will be joining a network of some of the most creative, innovative, and dedicated people in the industry with ample opportunities to learn and develop your career.

Our Associates are chosen for their attitude, skills, knowledge, and enthusiasm but above all, their belief that anything is possible.

Cognizant is an equal opportunities employer, and we welcome all applications regardless of race, colour, gender, ethnic origin, nationality, religion or beliefs, disability, age, sexual orientation, political opinions, or trade union membership.