Sid Walker
Watford
Summary
Junior Network Engineer with experience supporting global network operations across Cisco SD-WAN, switching, and enterprise connectivity. Experienced in P1/P2 incident support, network changes, device upgrades, and implementing customer connectivity requirements. Skilled in network monitoring, troubleshooting, technical documentation, and Python automation, with a focus on improving network reliability and operational efficiency.
Overview
1
1
Certification
5
5
years of professional experience
Work History
Junior Network Engineer
Computacenter
Hatfield, Hertfordshire
08.2025 - 09.2026
- Provided P1 and P2 support within SLA, including customer connectivity issues.
- Resolved Level 2 LAN and Wi-Fi connectivity incidents per incident management principles.
- Upgraded Cisco SD-WAN routers and implemented configuration changes across the global estate, following change-management and validation procedures.
- Migrated SD-WAN estate from configuration templates to group-based standards.
- Integrated new devices with stable configurations and AAA via Cisco ISE, ensuring secure access.
- Implemented customer connectivity requirements for device lifecycle, including firewall rules.
- Led worldwide switch software upgrades across HQ integration centres and branches.
- Rolled out Cisco ThousandEyes across the SD-WAN estate for path visibility.
- Deployed PRTG monitoring probes at remote sites and configured appropriate sensors for network and application monitoring
- Built out an ACI test environment to support automation workstreams.
- Delivered Wi-Fi-only rollout at HQ and UK sites, resolving roaming and signal strength issues.
Network Engineer Apprentice
Computacenter
Hatfield, Hertfordshire
09.2023 - 07.2025
- Provided L1 support for device failures and client connectivity issues, ensuring minimal disruption to client operations.
- Coordinated with Cisco TAC for timely processing of device RMAs post-failures, enhancing turnaround times for equipment replacements.
- Finalised RFS tasks within SLA's, including installation of Cisco Switch Stacks
- Upgraded over 100 devices in Computacenter integration centers, adhering to ITIL principles.
- Deployed lightweight APs across branch offices to ensure optimal functionality.
- Served as local contact for WiFi First proof of concept project, facilitating communication and project progression.
- Provided onsite support during major incidents.
- Gained practical knowledge through shadowing sessions in a Security Operations Centre (SOC) and Cyber Risk Management.
Retail Associate
Pomvom
Watford, Hertfordshire
03.2022 - 07.2023
- Managed transactions quickly and precisely while operating tills and guiding customers through the transaction.
- Fostered robust relationships with customers and colleagues through adept communication, and interpersonal skills.
- Elevated sales initiatives to boost revenue, and enhance customer satisfaction.
- Provided feedback in retail operations, cash management, customer engagement, and sales strategies.
- Captivated visitors by facilitating interactive Broomstick flight experiences, creating enjoyable and memorable moments.
- Conducted filming duties to capture customer experience.
Education
Level 4 Network Engineer Apprenticeship
Firebrand Training
Hatfield2025
BTEC Extended Diploma in Computing
West Herts College
Watford2023
GCSEs -
The Marlborough Science Academy
St Albans2021
Skills
- Cisco SD-WAN
- LAN installation
- LAN troubleshooting
- Network monitoring tools
- Network automation
- Network troubleshooting
- Incident management
- ITIL principles
- Technical documentation
- Problem-solving
- Asset management
- Python automation
Certification
- CCNP Enterprise Core
- Cisco Certified Network Associate
- Comptia Security+
- Comptia Network+
- Fortinet NSE3
- Working Towards CCNP SDWAN
Timeline
Junior Network Engineer
Computacenter
08.2025 - 09.2026
Network Engineer Apprentice
Computacenter
09.2023 - 07.2025
Retail Associate
Pomvom
03.2022 - 07.2023
Level 4 Network Engineer Apprenticeship
Firebrand Training
BTEC Extended Diploma in Computing
West Herts College
GCSEs -
The Marlborough Science Academy