82 Bt jobs in Croydon

Network & Infrastructure Engineer

Location: London / Hybrid

Salary: £40,000-£60,000

Overview

We are seeking an experienced Network & Infrastructure Engineer to design, implement, and support secure, scalable, and high-performing technology environments across our organisation.

This is an exciting opportunity to work at the cutting edge of Smart Building applications, IoT, IT/OT convergence to integrate building auto; HVAC, lighting, security and IoT with enterprise IT Systems.

This is a hybrid technical and stakeholder-facing role, combining hands-on engineering expertise with project delivery and business engagement skills. You’ll lead network and infrastructure initiatives end-to-end — from understanding user needs and translating them into technical designs, through to deployment, documentation, and optimisation.

The ideal candidate will have a strong grounding in network and security technologies, cloud infrastructure, and project management, with the ability to communicate effectively across technical and non-technical teams.

Key Responsibilities

Network & Infrastructure Design

• Design, deploy, and maintain network infrastructure including LAN/WAN, wireless, VPN, and firewalls.
• Configure and manage network segmentation, VLANs, and routing to support secure and efficient data flow.
• Oversee server, storage, and virtualisation environments (on-premise and/or cloud).
• Implement and maintain cloud connectivity and hybrid networking (Azure/AWS VPNs, ExpressRoute, etc.).

Security & Compliance

• Ensure network and infrastructure security align with organisational policies and standards (ISO27001, GDPR, etc.).
• Configure and monitor firewalls, intrusion detection/prevention systems, and endpoint security solutions.
• Support identity and access management, MFA, and secure network access policies.
• Conduct regular vulnerability assessments, patch management, and system hardening.

Project Management & Delivery

• Lead infrastructure and network projects from scoping through delivery, ensuring quality, cost, and time objectives are met.
• Define technical requirements and translate business needs into deliverable solutions.
• Develop and maintain project documentation including architecture diagrams, risk registers, and deployment guides.
• Manage vendors, suppliers, and third-party contractors to ensure aligned delivery outcomes.
• Apply structured project management methodologies (Agile, Prince2, or hybrid).

Stakeholder Engagement & Collaboration

• Act as a trusted advisor to internal teams and business units, gathering and translating technical requirements into actionable solutions.
• Collaborate closely with IT, Operations, Security, and external partners to ensure seamless integration and delivery.
• Communicate complex technical concepts in clear, non-technical language for diverse audiences.
• Provide updates and reports on project progress, risks, and mitigations to leadership and stakeholders.

Operations & Support

• Provide third-line support for network and infrastructure incidents and escalations.
• Monitor system performance and implement improvements to enhance reliability and scalability.
• Maintain detailed documentation of infrastructure, configurations, and changes.
• Participate in an on-call or escalation rota as required.

Qualifications & Experience

Essential:

• 5+ years’ experience in network and infrastructure engineering roles.
• Proven experience managing and delivering technical projects end-to-end.
• Strong knowledge of IP networking, routing, switching, VLANs, VPNs, and firewall configuration (Cisco, Fortinet, Palo Alto, etc.).
• Hands-on experience with cloud platforms (Microsoft Azure, AWS, or equivalent).
• Familiarity with Active Directory, Azure AD, DNS, DHCP, Group Policy, and M365 environments.
• Strong understanding of cybersecurity principles, access control, and encryption standards.
• Excellent communication, stakeholder engagement, and documentation skills.

Desirable:

• Relevant certifications (CCNA, CCNP, CompTIA Network+/Security+, Azure Administrator, etc.).
• Experience with infrastructure automation or scripting (PowerShell, Python).
• Knowledge of monitoring and observability tools (SolarWinds, PRTG, Grafana, etc.).
• Experience with ITIL practices and ServiceNow or equivalent ticketing systems.

Personal Attributes

• Technically curious, proactive, and solutions oriented.
• Confident engaging with technical and business stakeholders alike.
• Comfortable balancing hands-on technical work with structured project delivery.
• Strong organisational and time-management skills with a focus on quality and outcomes.

Why Join Us

• Be part of a forward-thinking technology function driving innovation and digital transformation.
• Work on diverse infrastructure and security projects with tangible business impact.
• Opportunities for ongoing professional development and certification.
• Supportive and collaborative environment where technical excellence is valued.

• Design, configure, and deploy complex network solutions, including routers, switches, firewalls, and load balancers.
• Monitor network performance and troubleshoot network issues, ensuring high availability and optimal performance.
• Implement and manage network security measures to protect against cyber threats.
• Develop and maintain network documentation, including diagrams, configurations, and procedures.
• Collaborate with cross-functional teams to support network-related projects and initiatives.
• Participate in on-call rotations to provide emergency network support.
• Stay current with emerging network technologies and industry best practices.
• Conduct capacity planning and performance tuning to ensure network scalability.
• Manage vendor relationships and evaluate new network hardware and software.
• Provide technical leadership and mentorship to junior network engineers.

• Bachelor's degree in Computer Science, Engineering, or a related field, or equivalent practical experience.
• 5+ years of experience in network engineering, with a focus on enterprise or service provider environments.
• In-depth knowledge of TCP/IP, BGP, OSPF, MPLS, VLANs, and other routing and switching protocols.
• Experience with network security concepts and technologies (e.g., VPNs, ACLs, IDS/IPS).
• Proficiency with network monitoring tools (e.g., SolarWinds, Nagios).
• Experience with Cisco, Juniper, or other major network hardware vendors.
• Relevant certifications such as CCNA, CCNP, or JNCIS are highly desirable.
• Strong analytical and problem-solving skills.
• Excellent communication and teamwork abilities.
• Ability to work effectively in a fast-paced, demanding environment.

• Design, configure, and maintain robust and scalable network infrastructure.
• Oversee the implementation and deployment of new network technologies and hardware.
• Ensure network security by implementing and managing firewalls, VPNs, and intrusion detection systems.
• Monitor network performance, identify bottlenecks, and implement optimisation strategies.
• Lead troubleshooting efforts for complex network issues, ensuring rapid resolution.
• Develop and maintain network documentation, including diagrams and configuration details.
• Collaborate with cross-functional teams to support business requirements and projects.
• Mentor and provide technical guidance to junior network engineers.
• Research and evaluate new network technologies to enhance performance and security.
• Develop and implement network automation solutions to improve efficiency.

• Bachelor's degree in Computer Science, Information Technology, or a related field.
• CCNP or CCIE certification (or equivalent experience).
• Minimum of 7 years of experience in network engineering and administration.
• In-depth knowledge of TCP/IP, routing protocols (BGP, OSPF), and switching technologies.
• Experience with network security best practices and firewall management.
• Proficiency with network monitoring and analysis tools (e.g., SolarWinds, Wireshark).
• Experience with cloud networking platforms (AWS, Azure) is a strong advantage.
• Strong analytical and problem-solving skills.
• Excellent communication and interpersonal abilities.
• Ability to work independently and as part of a team in a high-pressure environment.

• Design, deploy, and manage enterprise-level IP networks, including routers, switches, firewalls, and load balancers.
• Develop and implement network security policies and procedures to protect against cyber threats.
• Monitor network performance and identify potential bottlenecks or areas for improvement.
• Conduct root cause analysis for network incidents and implement corrective actions.
• Collaborate with vendors and stakeholders to evaluate and integrate new network technologies.
• Develop and maintain comprehensive network documentation.
• Provide technical leadership and mentorship to junior engineering staff.
• Participate in on-call rotation to provide 24/7 support for critical network issues.
• Stay abreast of industry trends and emerging technologies in telecommunications and networking.
• Ensure compliance with relevant industry standards and regulations.

• Bachelor's degree in Computer Science, Engineering, or a related field, or equivalent practical experience.
• Minimum of 5-7 years of experience in network engineering, with a focus on telecommunications.
• Proven expertise in BGP, OSPF, MPLS, and other routing protocols.
• Strong understanding of TCP/IP, DNS, DHCP, and other network services.
• Experience with network security technologies such as firewalls (e.g., Palo Alto, Cisco ASA), VPNs, and IDS/IPS.
• Familiarity with network monitoring tools (e.g., SolarWinds, Nagios).
• Excellent problem-solving and analytical skills.
• Strong communication and interpersonal skills, with the ability to explain complex technical concepts to non-technical audiences.
• Relevant industry certifications (e.g., CCNP, CCIE) are highly desirable.
• Experience with cloud networking concepts (e.g., AWS, Azure) is a plus.
• Ability to work effectively in a hybrid work environment, balancing remote and in-office collaboration.

• Design, configure, and deploy robust telecommunications network solutions.
• Monitor network performance, identify bottlenecks, and implement solutions for optimization.
• Troubleshoot and resolve network issues, ensuring minimal downtime and impact on services.
• Implement and maintain network security measures to protect against threats.
• Collaborate with cross-functional teams to integrate network solutions with other IT systems.
• Develop and maintain comprehensive network documentation, including diagrams and procedures.
• Stay current with emerging networking technologies and industry best practices.
• Participate in on-call rotations to provide 24/7 support for critical network incidents.
• Manage network hardware and software inventory and upgrades.
• Contribute to network capacity planning and future architecture development.

• Bachelor's degree in Computer Science, Telecommunications Engineering, or a related field.
• Minimum of 3 years of experience in telecommunications network engineering.
• Strong knowledge of networking protocols (TCP/IP, BGP, OSPF, MPLS).
• Experience with network hardware (routers, switches, firewalls) from major vendors.
• Familiarity with wireless technologies and mobile network infrastructure.
• Proficiency in network monitoring and diagnostic tools.
• Excellent problem-solving and analytical skills.
• Strong communication and interpersonal skills, with the ability to work effectively in a hybrid environment.
• Relevant certifications (e.g., CCNA, CCNP) are highly desirable.
• Experience with cloud networking concepts is a plus.

• Design, deploy, and manage complex network architectures, including LAN, WAN, and wireless networks.
• Ensure the security and integrity of network infrastructure through robust security measures and monitoring.
• Optimize network performance, troubleshoot connectivity issues, and resolve network outages promptly.
• Develop and implement network policies, procedures, and documentation.
• Collaborate with cross-functional teams to support new service rollouts and infrastructure upgrades.
• Evaluate and recommend new networking technologies and solutions.
• Mentor junior network engineers and provide technical guidance.
• Participate in on-call rotation to provide 24/7 network support as needed.
• Monitor network traffic and performance using various network management tools.
• Ensure compliance with industry standards and best practices.

• Proven experience as a Senior Network Engineer or similar role.
• In-depth knowledge of networking protocols (TCP/IP, BGP, OSPF, MPLS, etc.).
• Hands-on experience with network hardware from major vendors (e.g., Cisco, Juniper, Aruba).
• Strong understanding of network security principles and best practices (firewalls, VPNs, intrusion detection/prevention).
• Experience with network virtualization and cloud networking technologies.
• Excellent troubleshooting and problem-solving skills.
• Relevant industry certifications (e.g., CCIE, CCNP, JNCIE) are highly desirable.
• Bachelor's degree in Computer Science, Engineering, or a related field.
• Ability to work effectively in a hybrid work environment, managing responsibilities both remotely and in the office.
• Strong communication and interpersonal skills.

• Designing, configuring, and deploying robust network solutions.
• Monitoring network performance and identifying potential bottlenecks or security vulnerabilities.
• Providing Tier 3 support for network-related incidents and resolving them in a timely manner.
• Collaborating with cross-functional teams to integrate network services with other IT systems.
• Developing and maintaining comprehensive network documentation, including diagrams and standard operating procedures.
• Evaluating and recommending new network technologies and solutions to meet business needs.
• Leading network security initiatives, including the implementation of security policies and intrusion detection systems.
• Mentoring junior network engineers and sharing knowledge within the team.
• Ensuring compliance with industry best practices and regulatory requirements.
• Participating in on-call rotations for critical network support.