Senior Network Support Specialist Level 3 to support secure mission-critical communications and network infrastructure operating within complex defence and security environments

Our public sector client is seeking a Senior Network Support Specialist Level 3 to support secure mission-critical communications and network infrastructure operating within complex defence and security environments .

This role supports the maintenance, configuration, accreditation, and operational sustainment of classified and protected network environments. The setting includes enterprise and tactical communications systems, wireless networks, SATCOM, VPN technologies, cross-domain solutions, and multi-site infrastructure operating across geographically dispersed locations.

Responsibilities

- Analyze, evaluate, test, and recommend data communication hardware and software solutions
- Coordinate installation, maintenance, troubleshooting, and resolution of hardware and software issues across secure network environments
- Support accreditation activities for classified and protected IT systems and prepare associated accreditation documentation
- Prepare technical reports, network architecture documentation, configuration guides, standard operating procedures, and technical presentations
- Monitor network performance and traffic, maintain service records, update network diagrams, and document issues, resolutions,



and lessons learned
- Develop and maintain security and accreditation documentation, including operational concepts, risk assessments, and authorization packages
- Support the development, testing, and maintenance of network continuity and disaster recovery plans
- Collaborate with technical teams, stakeholders, and operational users to ensure network availability and performance
- Participate in system integration, testing, and sustainment activities within secure environments

Must Haves

- Network Support Specialist - 10+ years
- Ultra-High Frequency (UHF) , Very-High Frequency (VHF) , or Beyond Line of Sight (BLOS) - 3+ years

Nice to Have

- 5+ years evaluating, testing, and recommending data communication hardware and software
- 5+ years preparing technical documentation, procedure manuals, and operating guides
- 5+ years monitoring network traffic, supporting capacity planning activities, and testing disaster recovery procedures
- 5+ years delivering user training, familiarization sessions, or technical knowledge transfer
- 5+ years maintaining technical records, asset inventories, network diagrams, wiring documentation, and issue logs

Disclaimer:
AI may be used in evaluating candidates.
This posting is for an existing vacancy.

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📌 Senior Network Support Specialist Level 3 to support secure mission-critical communications and network infrastructure operating within complex defence and security environments (London)
🏢 S.i. Systems
📍 London