Executive Assistant to Founder

Are you an established Executive Assistant with a background in a science or engineering based industry who would enjoy supporting a visionary founder of a successful scale‑up in the nanotechnology industry? Do you have a flexible and adaptable mindset where no two days look the same? Can you build effective relationships with the wider technical community and internal team members?

• £38,000 to £48,000 (depending on experience)
• 25 days annual leave, death in service and private health care benefits, personal pension contributions of 4% with salary sacrifice and a generous EMI Share scheme.

Based in Abingdon, Oxford, UK, we are a high calibre team of 100 plus people and we are growing fast. We are backed by global financial and industry investors including Applied Ventures, the strategic venture arm of the industry leading equipment company.

This role requires working from our headquarters at:
Suite 1, Hitching Court, Abingdon Business Park, Abingdon, Oxfordshire, OX14 1RG
, United Kingdom for the majority of the time.

You will be providing comprehensive support to a very busy CTO, ensuring the smooth running of all aspects of his day.

• Proactively managing complex and fast‑changing diaries, coordinating meetings, appointments, and travel across multiple time zones.
• Using tech such as co‑pilot to support meetings with: preparing agendas, minutes, tracking actions, and following up.
• Ensuring the CTO is fully briefed ahead of meetings and his time is managed effectively. (Pre‑reading presentations and documents ahead of time.)
• Handling email correspondence and wider communications on behalf of the CTO, ensuring timely and professional responses.
• Supporting ad‑hoc projects and initiatives as required by the CTO.
• Coordinating overseas and domestic travel arrangements and producing detailed travel itineraries to ensure smooth journeys.

• Executive Assistant or Personal Assistant at a C‑suite level.
• A high level of attention to detail and accuracy – you will be working for a scientist!
• Outstanding written and verbal communication skills, with the ability to interact professionally with individuals at all levels.
• Confident with all Microsoft and relevant AI tools.
• Discretion, tact, and the ability to handle confidential information appropriately.
• Flexibility and adaptability to changing priorities and demands.
• Ability to work closely with existing PA to CEO, to support each other’s workloads and provide holiday cover when required.
• Confidence working in a highly technical scientific culture.

• Self‑management:
  Able to work independently, setting priorities for own work based upon the company goals and targets.
• Teamwork:
  Engages with other members of the company to bring the best solutions to the problem. Recognises the value that fellow company members bring to enhance own abilities. Supports colleagues with their tasks when critical to the company goals.
• Impact and Influence:
  Establishes themselves as the knowledge centre in their own field.
• Ownership & Initiative:
  Reacts and addresses both short‑ and medium‑term issues and proactively takes action to solve them.
• Results Orientation:
  Focus on the company goal, avoid distraction, making timely decisions to achieve the target.

Infinitesima is a privately owned company founded in 2001, as a spin‑out of the University of Bristol, by CTO Professor Andrew Humphris. Our dynamic team of scientists and engineers is focussed on enabling the next generation of semiconductor devices through delivery of innovative products to customers around the world.

Our strength lies in the varied perspectives that come from different cultures, experiences, and identities. We believe that true innovation is fuelled by collaboration, locally and globally. We strive to foster an environment where everyone can contribute meaningfully and thrive.

We use AI only to transcribe our interviews so we can focus fully on you instead of scribbling notes. The AI does not take part in any decision making at any stage. All hiring decisions are made by real humans based on the conversation we have with you.

We welcome applicants from all backgrounds and aim to create a fair, supportive recruitment process. To keep things clear, this role needs someone who already has the permanent right to work in the UK.