John Sim
Head of Information Technology & Security @VIOOH
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WORK HISTORY
Head of Information Technology & Security @VIOOH
London, GB
ResponsibilitiesOwn company-wide IT & Security strategy, driving a cloud-first, SaaS-native approach that enables a hybrid workforce while meeting regulatory and client expectations.Lead ISO 27001 certification programme, aligning policies, controls, and evidence across Engineering, SRE, Architecture, Data Products, People, Finance, Commercial, Marketing, and Operations.Oversee IT service delivery, end-user computing, SaaS lifecycle management, and vendor governance, ensuring performance, cost-effectiveness, and risk mitigation.Direct security operations including vulnerability management, endpoint security, phishing resilience, incident response, and access control.Partner with senior leadership to balance operational efficiency, risk management, and business growth objectives.Champion automation across IT and security, developing scripts and workflows that reduce manual effort and increase reliability.AchievementsLaunched and led VIOOH’s ISO 27001 certification journey, building governance frameworks, department-specific controls, and audit-ready evidence models using Drata.Established a modern IT & Security operating model combining SaaS administration, automation, and continuous monitoring to reduce risk and overhead.Delivered a cyber risk dashboard for executives, integrating live feeds from Darktrace, Rapid7, Google Workspace, and Bitdefender to provide clear visibility on threats and controls.Automated onboarding/offboarding, endpoint deployment, and security agent rollout via JumpCloud, Google Workspace, and API-driven scripts, cutting manual workload significantly.Built a scalable IT foundation aligned to VIOOH’s rapid international growth, enabling secure collaboration, faster delivery cycles, and improved audit readiness.Recognised as a business enabler by aligning IT & Security with commercial needs, reducing friction while meeting enterprise client due diligence standards.
EDUCATION
Ponteland County High School
Computer Science, Physics, Biology
SKILLS
ABOUT JOHN SIM
I’m an experienced IT & Security leader with a background that spans engineering, service delivery, and strategic leadership in cloud-first, SaaS-driven organisations. I’ve built teams, shipped systems, battled outages, and steered scaleups through the maze of compliance and complexity — all while making sure the tech serves the people, not the other way around.My sweet spot? Turning sprawling technical detail into something meaningful for both engineers and executives. Whether I’m designing solutions, leading incidents, or navigating ISO27001 and GDPR, I bring a calm head, a sharp eye, and a bias for action.• Deep technical roots, strong commercial awareness• Clear communication at every level — engineer to exec• Incident and problem management that actually solves problems• Seamless service transition & improvement• Stakeholder confidence, even under pressure• Security strategy with practical enforcement, not just policy
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