Office Administrator

A fantastic opportunity has become available for an Office Administrator to join Caristo Diagnostics's rapidly growing team. Based in Oxford, you will work in our global data operations team with colleagues in both UK and US.

Caristo Diagnostics is a global leader in AI technologies for cardiovascular disease, founded as a spin-out from the University of Oxford. Its award-winning technology helps detect hidden heart disease and identify people at risk of a heart attack before symptoms appear. Working with leading hospitals, research institutions, and pharmaceutical partners, Caristo aims to save lives through early detection and personalized prevention.

The company was named a 2026 Technology Pioneer by the World Economic Forum in June 2026. Learn more at  or follow Caristo on Linked In, You Tube, and X.

Named first of “7 Technologies That Could Change Heart Healthcare Forevermore” by the Robb Report, the CaRi-Heart® technology is Caristo’s flagship offering which uncovers hidden coronary inflammation, a key driver of cardiovascular disease, on routine Coronary Computed Tomography Angiography (CCTA). The technology is regulatory-approved for commercial use in Europe and Australia, and is currently being piloted in several NHS sites. The CaRi-Heart Technology is also a receipt of the NHS AI award, and has been recognised by the British Heart Foundation as a game-changing innovation for preventing cardiovascular disease.

Multiple patents underpinning CaRi-Heart technologies have been granted in major jurisdictions around the world. In addition, exceptional validation results showing CaRi-Heart’s ability to aid the prediction of heart attacks have been published in leading medical journals including the Lancet, JACC, European Heart Journal, and Cardiovascular Research.

The Office Administrator will play a critical role in ensuring the smooth and efficient operation of the UK office, and providing administrative support to various departments.

The ideal candidate will:

• be motivated at the thought of working in an innovative healthcare start-up with a strong collaborative research and operations culture, helping to build a global business that will have material impact on the health and wellbeing of potentially millions of people.
• share the company values of pushing the boundaries, taking ownership, caring for each other and acting with candour and professionalism.

Responsibilities

• Greet visitors, answer phone calls, and respond to inquiries in a professional and courteous manner.
• Manage office facilities, arrange and oversee general repairs and maintenance, manage cleaning contractors, manage communications with landlord.
• Coordinate office safety and security measures, including emergency preparedness, fire drills, and access control procedures.
• Monitor and maintain office cleanliness, organisation, and appearance, coordinating with cleaning staff or facilities management as needed.
• Track stocks of office supplies including stationery and manage coffee/fruit deliveries.
• Manage company correspondence, including phone calls, emails, letters and packages (incoming and outgoing).
• Scans and file documents to SharePoint as needed.
• Help arrange UK company team and marketing events, organise meetings, schedule appointments, create agendas and take meeting notes.
• Coordinate travel arrangements, including itineraries, visas, and accommodation, with meticulous attention to detail.

• Support HR function, including drafting job descriptions, populate templates for Offer Letters and Employment Contracts, obtain references and DBS checks, liaise with HR benefits providers, update BambooHR software platform.
• Handle…