Executive Assistant to COO

About the role

Quantanite is seeking a proactive Executive Assistant to support its Chief Operating Officer. This onsite role in Sandton, Johannesburg aligns with US working hours, offering direct exposure to senior‑level decision‑making and international business operations.

Key responsibilities

• Manage the COO’s calendar, meetings, communications and follow‑ups.
• Prepare meeting agendas, briefing materials, presentations and supporting documents.
• Maintain visibility of priorities, deadlines and outstanding actions.
• Anticipate needs and proactively gather required information or resources.
• Coordinate cross‑functional projects and ensure timely completion of high‑priority initiatives.
• Handle confidential and commercially sensitive information with utmost discretion.

Required profile

• Highly organized with strong judgement and the ability to work independently.
• Excellent written and verbal communication skills.
• Experience supporting senior executives in a fast‑paced, international environment.
• Ability to engage confidently with senior stakeholders across multiple regions.
• Flexibility to work US business hours, including adjustments for daylight‑saving changes.

Required skills

• Advanced calendar and email management.
• Proficiency in preparing professional presentations and briefing documents.
• Strong project coordination abilities.

What we offer

• Opportunity to work closely with a senior leader of a global organization.
• Exposure to strategic initiatives across multiple continents.
• Collaborative, people‑first culture that values both results and relationships.