Network Infrastructure Engineer

CommonAI CIC

. Design the physical network for each new cluster across out-of-band, frontend/storage and accelerator fabrics, including topology, switch placement, port maps, cable schedules and bills of materials .

Posted 10/31/2026full-timeCambridge • United KingdomMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and implementing network infrastructures for HPC or AI clusters, with a strong focus on out-of-band, frontend, and accelerator fabric networking. Proficient in producing detailed documentation and collaborating effectively with technical teams and project managers.

Highest-signal resume keywords

Network Design For HPC Or AI ClustersOut-Of-Band NetworkingInfiniBand And RoCE Knowledge400G/800G Ethernet ExperienceDocumentation Tools Such As NetBox

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Network Topology DesignFibre Optics KnowledgeTransceiver SelectionCable SchedulingLoss Budget CalculationTesting And InspectionFault-FindingInstallation OversightTechnical Specification ProductionAs-Built Documentation Maintenance

Soft Skills

Clear CommunicationCollaborationProject Management Support

Tools & Technologies

NetBoxOptical Circuit SwitchingHigh-Density RacksColocation Facilities

Industry Keywords

Data Centre NetworkingLossless FabricsFat-Tree TopologiesRail-Optimised TopologiesPatch Panel Arrangements

Tech Stack

Tools & technologies

Switching

About the role

Key responsibilities & impact

Design the physical network for each new cluster across out-of-band, frontend/storage and accelerator fabrics, including topology, switch placement, port maps, cable schedules and bills of materials
Specify fibre and copper infrastructure, including fibre grade, connectors, polarity, pinning, trunk and cassette layouts, patch-panel arrangements and end-to-end loss budgets
Select matching transceivers, DACs and AOCs
Plan changes to existing clusters so equipment can be re-cabled and reused with minimal disruption
Act as technical authority for suppliers and installers by producing drawings and specifications, reviewing quotations, and inspecting and testing completed work
Maintain accurate, well-labelled as-built documentation of every rack, cable, port and link
Work with project managers on sequencing and lead times
Collaborate with operators and software colleagues on bring-up and fault-finding
Produce complete network designs for upcoming clusters, oversee installations, test links and hand over as-built documentation to operations

Requirements

What you’ll need

Experience designing networks for HPC or AI cluster deployments, with examples of designs owned from specification to installation
Thorough understanding of out-of-band, frontend and accelerator (GPU) fabric networking
Practical knowledge of InfiniBand, RoCE or similar lossless fabrics, including fat-tree and rail-optimised topologies
Clear understanding of data centre fibre optics: OS2 versus OM4/OM5, MTP/MPO versus LC, APC versus UPC, Type A/B/C polarity, pinned and unpinned connectors, and losses introduced by patch panels, cassettes and connectors
Ability to communicate designs clearly to installers, suppliers, project managers and engineers
Experience with 400G/800G Ethernet and OSFP/QSFP-DD optics, optical circuit switching or other novel interconnects, high-density liquid- or air-cooled racks, documentation tools such as NetBox, and colocation facilities is useful
Qualifications and vendor certifications are useful but secondary to experience and work quality
Willingness or ability to work during UK business hours, with occasional evenings or weekends for major installation work
Willingness to travel to the Kao Data lab in Harlow and future sites elsewhere in the UK
Earlier-career candidates may be considered with strong evidence of ability

Benefits

Comp & perks

A collaborative and supportive work environment
The opportunity to have a high impact in a growing organisation
Competitive salary package, including pension and benefits
Professional development opportunities
Networking opportunities with influential figures from across the tech sector and academia
A vibrant office environment located a few minutes' walk away from Cambridge train station
Hybrid and fully remote work arrangements considered
Permanent, part-time or consultancy arrangements considered
Support generally limited to UK business hours
Occasional evening or weekend scheduling for major installation work