Solution Lead / Chief Engineer - DV required - Outside IR35

Location: London (fully onsite) Duration: 12 month contract Rate: £118ph LTD (Outside IR35) Clearance: Active DV required Role details: We are seeking an experienced Unified Communications (UC) Solution Lead to design,…

Outside IR35 Public Sector
Pay rate £118/hour
Contract type Contract
Posted 8 October 2026

Trusted. Transparent. Built for contractors. Thousands of UK contractors find their next contract on ContractorUK.

View all public sector & defence jobs ›

About this contract

Location: London (fully onsite)

Duration: 12 month contract

Rate: £118ph LTD (Outside IR35)

Clearance: Active DV required

Role details:

We are seeking an experienced Unified Communications (UC) Solution Lead to design, develop and deliver secure communication and collaboration solutions within highly regulated defence environments.

The successful candidate will lead the architecture and integration of enterprise-scale Unified Communications platforms, enabling secure voice, video, messaging and collaboration services across complex and segregated network environments. This role requires a strong blend of technical leadership, stakeholder management and secure solution design expertise, with a particular focus on interoperability, resilience and information assurance.

Responsibilities:

Produce and own High-Level Designs (HLDs) and Low-Level Designs (LLDs) for Unified Communications solutions.
Design scalable, resilient and secure voice, video and collaboration services aligned to customer requirements.
Design and deploy secure cross-domain solutions (CDS), guards, and multi-level security (MLS) gateways that allow video, voice, and chat to flow securely between separate classified or isolated networks.
Define end-to-end technical architectures covering
SIP and VoIP services
Telephony and call routing platforms
Video Teleconferencing (VTC)
Instant Messaging and Presence services
Collaboration and productivity platforms
Ensure designs adhere to defence security standards, accreditation requirements and architectural governance processes.

Essential Skills & Experience:

Active DV Clearance
Strong understanding of:
SIP
VoIP
Call routing
Telephony integration
Proven experience producing High-Level Design (HLD) and Low-Level Design (LLD) documentation.
Experience delivering enterprise Unified Communications solutions.
Ability to act as a senior technical point of contact for customers and stakeholders.
Demonstrable experience managing technical stakeholders and supporting complex project delivery.
Experience operating within secure, mission-critical or defence environments.
Desired skill: Knowledge of Cross-Domain Architecture, including multi-security domain communications.

Interested? Apply today via the link provided

Apply for this job

You'll complete your application on CV-Library, our jobs partner.

← More public sector & defence jobs

Set up for this contract

ContractorUK partners
Markel Direct IR35 and contractor insurance

Most agencies and clients ask for professional indemnity and public liability before you start.

Get your quote →
SG Accounting Contractor accountants

Outside IR35 means working through your own limited company, so an accountant who knows contracting matters.

Find out more → Also: Caroola · Dolan Accountancy · Compare all accountants

Get new Public Sector contracts by email

One email when new matches appear. Unsubscribe with one click.

Prefer to be found? Upload your CV to CV-Library — free