Senior Executive Assistant to CEO (US & UK Based) | Cutting-Edge AI Tech Start-Up

Location: San Francisco

Reports to: CEO, who travels regularly between the UK and the US, and who works across both time zones

Industry: Artificial Intelligence | Technology

Type: Full-Time | Permanent

Salary and package is dependent on experience

The Company

Join an early-stage global AI Tech start-up founded by a visionary leader in the tech space, redefining the future of a specialist area of AI. As they continue a rapid growth journey, they are seeking a dynamic, highly capable Executive Assistant (EA) based in San Francisco (SF) to provide seamless support to the CEO, who travels regularly between the US (SF) and the UK (London).

This is a rare and varied opportunity to join a fast-paced, mission-driven organisation at the intersection of behavioural science and advanced AI innovation.

The Role

As the Executive Assistant to the CEO, you will act as a strategic partner and trusted right-hand, enabling the CEO to focus on scaling the business and driving strategic initiatives. Beyond traditional EA responsibilities, you will be directly involved in high-impact deliverables, including the development of pitch decks, client presentations, board updates, and key client engagement materials.

This is an exciting role for someone who thrives in a fast-paced, high-growth environment and is passionate about technology, innovation, and being close to the heart of business operations.

We’re looking for an individual who is at ease with a hybrid work arrangement, combining in-office duties with remote work during the CEO’s time in the UK.

Flexibility to work outside standard business hours, accommodating predominantly the UK time zone, is essential.

Key Responsibilities for the Senior EA

• Provide proactive and high-level administrative support to the Chief Executive Officer (CEO).
• Manage a complex and ever-changing calendar, prioritising meetings across the US, UK, and global time zones.
• Coordinate travel arrangements, itineraries, and logistics for domestic and international travel.
• Prepare and assist in the creation of high-quality deliverables, including pitch decks, client presentations, board updates, and strategic reports.
• Participate in client engagement initiatives and support key stakeholder communications.
• Actively participate in team meetings and follow up on action items.
• Act as a liaison between the CEO and internal/external stakeholders, maintaining high levels of professionalism and discretion.
• Support project management activities, tracking deadlines and deliverables.
• Handle confidential information with sensitivity and integrity.
• Anticipate the CEO’s needs and provide strategic support to ensure optimal efficiency.
• Be flexible and responsive, willing to work outside of regular hours as needed to align with UK-based operations.

About You

• Proven experience (ideally 5+ years) as an Executive Assistant or in a similar role supporting C-suite executives, within a start-up or high-growth tech environment – essential
• Strong experience working with Google Workspace (Docs, Sheets, Slides, Drive, Calendar) — essential.
• Prior experience supporting a remote executive or working across multiple time zones.
• Exceptional organisational skills, with a strong attention to detail, are a must.
• Highly proficient in creating polished pitch decks and client-facing presentations.
• Outstanding communication skills, both written and verbal.
• High level of discretion and ability to handle sensitive information.
• Proactive, resourceful, and able to work independently with minimal supervision.
• Adaptable and comfortable operating in an agile, high-growth start-up environment.
• Flexibility to work extended or non-traditional hours to ensure seamless support.
• A genuine interest in AI, technology, and innovation.

Why Join?

• Equity plan consideration for the right candidate
• Be part of a revolutionary company at the forefront of AI
• Work closely with a visionary founder and leadership team on critical projects.
• Flexible remote working with opportunities for international collaboration.
• A dynamic, ambitious, and mission-driven culture.
• Competitive compensation and benefits package.