Office Administrator – Oxford

About the role

Caristo Diagnostics is seeking an Office Administrator to ensure smooth operation of its UK office and provide administrative support across departments. The role is based in Oxford and works closely with the global data operations team.

Key responsibilities

• Greet visitors, answer calls and manage office facilities, including repairs, cleaning contractors and security measures.
• Provide HR support such as drafting job descriptions, handling offer letters, managing BambooHR, and maintaining confidentiality.
• Assist finance with bookkeeping tasks: process invoices, employee expenses, bank reconciliation and VAT administration.

Required profile

• Qualifications in clerical, secretarial or finance studies or proven office admin/PA experience.
• Proficiency with Microsoft Office and collaboration tools (DocuSign, Teams, Slack, Zoom).
• Strong organisational, problem‑solving and communication skills, with ability to handle confidential information.

Required skills

• Microsoft Office Suite (Word, Excel, PowerPoint, Outlook)
• Collaboration tools: DocuSign, Teams, Slack, Zoom

What we offer

• Competitive salary
• 25 holidays plus bank holidays
• Enhanced pension contribution
• Private medical and life insurance
• Cycle‑to‑work scheme and long‑service benefits