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Meet the Team

At Flagstone International, our people are central to everything we do. From our founders and client-facing specialists to our expert support and operational teams, every individual plays a key role in delivering exceptional service, innovative financial solutions, and a seamless cash management experience for our clients.

Leadership Team

Aidan McAvinue

Aidan McAvinue

Chief Executive Officer

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Helen Vieira

Helen Vieira

Head of Banks

Ed Creswell

Ed Creswell

Commercial Director

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Sarah Carey

Sarah Carey

Head of People

Mia Canavan

Mia Canavan

Head of Compliance

Andrew Holmes

Andrew Holmes

Director of Operations

Our Founders

Andrew Thatcher

Andrew Thatcher

Co-Founder and Chairman, Flagstone International

Simon Merchant

Simon Merchant

Co-Founder and Chairman, Flagstone UK

Client Facing Team

William Baxter

William Baxter

Partnership Manager (Banks)

Kate Brogan

Kate Brogan

Account Manager

The Teams Powering Flagstone International

Behind the scenes, Flagstone International’s specialist support and back-office teams ensure our platform operates securely, efficiently, and at scale. Their expertise supports every client interaction and enables us to deliver a seamless multi-bank deposit and FX experience.

Client Services

​Our dedicated Client Services team provides fast, knowledgeable support—resolving queries efficiently and ensuring a consistently high standard of service across all client touchpoints.

Client Onboarding

The Onboarding Team supports new clients through a structured, compliant registration process, ensuring accuracy, security, and a smooth transition onto the Flagstone International platform.

Engineering & Development

Our Engineering and Development Teams are responsible for continuous platform innovation. They maintain a secure, reliable, and user-friendly technology infrastructure that supports institutional-grade deposits and FX execution.

Banking & Partner Management

The Banking Team manages and develops relationships with our global network of partner banks, ensuring clients have access to competitive deposit products and diversified counterparty risk.

Marketing & Communications

Our Marketing Team communicates Flagstone International’s value proposition through clear messaging, strategic campaigns, and client-focused content—supporting brand trust, education, and long-term growth.

Speak to a member of our team

Each member brings a wealth of experience to help our clients achieve their financial goals with confidence and ease.

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