Voice & Unified Communications Engineer / Architect - freelance - hybrid, London, UK

We are committed to building an inclusive workplace and encourage applications from women and other under-represented groups in tech. All qualified candidates are welcome.

Start date: Apr/ May 2026 
Location: London, UK (Hybrid — minimum 2 days per week in office)

We are committed to building an inclusive workplace and encourage applications from all qualified candidates.

The organisation operates a complex, fragmented voice environment comprising two separate legacy stacks — on-premises Cisco CUCM (with differing soft client versions across the two banking entities), BT trading turret platforms, and disparate voice recording systems (Redbox and Variant). A planned migration to Cisco WebEx cloud was paused due to inadequate change management planning. This role will define and deliver a rationalised voice and UC target state, with particular focus on trading floor voice requirements. Key responsibilities Assess the current voice and UC estate across both banking entities: CUCM, Cisco Cubes, WebEx, trading turrets (BT platforms), voice recording (Redbox, Variant) Define a target-state voice architecture aligned to the broader infrastructure transformation Develop a structured migration plan to Cisco WebEx (or alternative cloud UC platform), incorporating full change management, user communications, and phased rollout Ensure integration requirements are fully assessed prior to any migration: voice recording, turret integration, adjunct services, front office workflows Manage end-user impact and change communications — particularly for trading floor users where voice is business-critical Evaluate and rationalise voice recording platforms, ensuring regulatory compliance requirements are met Work with the network team to ensure QoS, connectivity, and resilience requirements are addressed in the network design Requirements Technical requirements Cisco Unified Communications Manager (CUCM): design, administration, and migration Cisco WebEx (cloud UC): deployment, migration from on-premises, integration Cisco Cube (session border controller) configuration and dial plan design Trading turret platforms: BT ITS or equivalent — integration and interoperability Voice recording platforms: Redbox, Verint, NICE, or equivalent — regulatory compliance context SIP trunking, dial plan design, and PSTN gateway architecture QoS for voice and UC across LAN/WAN environments Understanding of MiFID II / FCA voice recording obligations in financial services Advantageous CCNP Collaboration or equivalent Experience with soft client migration (Java-based to WebEx or Teams) Knowledge of front office / trading floor communication requirements Microsoft Teams voice integration experience Soft skills Strong project and change management discipline — able to design and execute structured migrations with appropriate user engagement Ability to manage stakeholder expectations across trading floor, IT, and compliance audiences Methodical and risk-aware, with particular sensitivity to business-critical voice systems