Deadly Tech has worked with various clients since its creation in 2006. The following is a list of direct and indirect clients:
- ESB Ireland
- Lloyds Banking Group
- Bluefin Solutions for Deloitte, Hampshire County Council
- Serco Group
- Glasgow City Council
- Vodafone (via iGATE)
- Serco Solutions (consulting division, prev ITNET) - customers: ARM, Bedfordshire County Council, East Sussex County Council, London Borough of Enfield, London Borough of Southwark, Travelodge, Worcestershire County Council, UKHO
- BAE Systems
- Manchester City Council