PeeJayEff Services client list includes both large and small companies and organisations. The list includes IBM Ireland, Computacenter, Xpertise/PowerEducation, AnIX Computers, Engineering Design Centre at the University of Newcastle upon Tyne, Fujitsu Services, Talk Talk Group, ip.access, Experian, Barclays BTCR, Smart421, Capital One, HP (UK), HP Enterprise (UK) and DXC Technology.