Senior Electrical Design Engineer Rate: £41.28 per hour | Inside IR35 | Location: Epsom / London A leading building design practice is seeking a Senior/Principal Electrical Design Engineer to support projects across London & the South East. Projects span aviation, residential, commercial, education, healthcare, transport, defence, and energy. Responsibilities: Design and specification of all Electrical Building Services systems (power, lighting, earthing, life safety, security, lifts, telecoms, lightning protection). Perform detailed calculations using Amtech/Prodesign, Dialux/Relux, Excel, and in-house tools. Produce NBS specifications, Revit models, reports, and technical notes. Undertake site surveys, inspections, and monitor works. Manage workload, contribute to project delivery, and mentor junior staff. Requirements: Degree in Building Services or Electrical Engineering. Chartered Engineer (CIBSE/IET preferred). Experience in consultancy or contractor design environment. Competent with design software and Microsoft Office; HV experience beneficial. Knowledge of energy reduction, decarbonisation, and building physics. We can only consider applications from those eligible to work in the UK for this position. This position will require some additional checks to ensure site access. For more information, contact Marika Powell at ARM on 02392 228232 or email CV and covering letter to marika.powell@arm.co.uk.