Executive Assistant in Cardiff

Assystem is an international company with one mission: accelerate the energy transition around the world. Every day, our 6,500 switchers located in 12 countries (Europe, Middle East, Pacific Asia & Africa) connect their six thousand billion neurons to tackle the task of the century: switching to low-carbon energy. We are a collective committed to the actors who are making the energy switch. Sharing our knowledge, expertise and values allows us to innovate and think differently about the energy transition. Drawing on more than 55 years’ experience in highly regulated sectors subject to strict security and safety requirements, we provide our customers with engineering and project management services, as well as digital services and solutions to optimize the performance of complex infrastructure projects throughout their life cycle. The Group is currently ranked second in the world for nuclear engineering.

We are seeking an exceptional Executive Assistant to provide strategic and operational support to Director-level leadership within a dynamic and fast-paced organisation. At Assystem, we support the delivery of complex infrastructure and energy programmes that contribute to the global transition to low carbon energy. This is a pivotal role suited to a highly capable EA who operates as a trusted partner to senior leaders, anticipating needs, enabling effective decision-making, and ensuring priorities are executed seamlessly. This role enables leadership effectiveness by ensuring Directors can focus on delivering complex programmes, strategic priorities, and organisational performance.

Your missions

• Provide high-level executive support to Directors, managing complex and evolving priorities.
• Oversee strategic diary management, ensuring alignment with business objectives.
• Prepare high-quality briefings, reports, and presentations for senior meetings.
• Coordinate leadership meetings, governance activity, track actions arising from leadership meetings and ensure timely follow up.
• Act as a professional liaison between Directors, senior stakeholders, and external partners.
• Manage confidential communications and sensitive information with discretion.
• Support planning, projects, and cross-functional initiatives as required.
• Identify opportunities to improve administrative and operational efficiency and ways of working.
• Manage and prioritise email and communications on behalf of Directors where appropriate.
• Act as a gatekeeper for Directors’ time, ensuring focus on strategic priorities.
• Coordinate leadership events, workshops and offsite meetings where required.
• Arrange complex travel itineraries and logistics where required.
• Occasional UK travel may be required to support leadership meetings or events.

My profile

• Significant experience supporting senior leadership at Director or Executive level.
• A proactive, solutions-oriented approach with strong commercial awareness.
• Exceptional organisational and prioritisation skills.
• Confident communicator with strong stakeholder management capability.
• Demonstrated ability to operate with discretion, judgement, and professionalism.
• Highly adaptable, resilient, and comfortable working at pace.
• Advanced proficiency in Microsoft Office.

Why Join Assystem?

• Work on nationally significant, technically complex projects.
• Strong career development and progression opportunities.
• 25 days annual leave (buy and sell leave scheme).
• Opportunity to make a real impact in energy, defence and infrastructure.

Security clearance

This role requires the successful candidate to hold a minimum of a Security Check (SC) clearance without any caveats to that clearance. Due to the nature of work this role will be delivering and for the protection of certain assets, the successful candidate has to be a UK national or in MoD approved cases a Dual National from a non-ITAR country.

NOTICE TO CANDIDATES ON RECRUITMENT FRAUD – We are committed to safeguarding candidates from fraudulent activity associated with our recruitment process. Please note that we will never offer specialist CV writing services, request.