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John Armstrong has a diverse work experience spanning various industries and roles. John currently serves as the Chief HI Officer at Differential Technologies (UK) Limited since July 2021. Prior to this, they worked at Ocado Technology where they held the positions of Head of Client Transition and International Programme Delivery Manager starting from 2018. Before joining Ocado Technology, they worked at River Island as the IT Engineering Manager, Digital, overseeing release management, third-party agency relationships, and digital engineering activities. John also worked at British American Tobacco as a Solutions Delivery Manager, leading IT operations and project delivery for various platforms. John gained experience in IT programme and project management at Tesco DotCom and Dixons Retail. Additionally, they worked as an IT Programme and Project Manager at Armstrong Consulting UK Ltd and PJ Media. John also worked as an IT Project Manager at PJ Media, both in Doha, Qatar and in the UK.

John Armstrong has a Bachelor's degree in Microbiology from The University of Sheffield, which they obtained from 1979 to 1982. John then pursued a PhD in Molecular Biology from the University of Nottingham, completing it from 1982 to 1986. Later, in 1996 to 1999, they pursued a Master's degree in Computer Studies from the University of Hertfordshire. In 2007, they completed a Six Sigma Greenbelt certification, and in 2008, they obtained a PRINCE2 Practitioner certification. Finally, in 2010, they acquired a Programme Management certification as an MSP Practitioner, focusing on Programme Management.