Out of Hours Executive Assistant

What being part of the Sigma Family means for you

Executive Assistant – Out of Hours

📍WFH

Lead. Inspire. Deliver Results.

This is an exciting opportunity for an Executive Assistant professional who would provide comprehensive administrative and logistical support to senior executives based in the UK, ensuring the seamless operation of daily activities within a fast-paced, high-demand environment.

At Sigma, we're looking for an exceptional Executive Assistant manage a diverse range of tasks to enhance team efficiency, including organising schedules, coordinating meetings, and handling complex travel arrangements.

This is an opportunity to join an award-winning business where you will directly shape operational success, colleague engagement, and client growth.

Why Sigma?

For four consecutive years, Sigma has been recognised by the Sunday Times Best Places to Work, voted for by our people. We believe in #ImproveEverythingAlways and create an environment where ambitious leaders can thrive, grow and make a real impact.

What you'll get

📈 Career development and opportunities to apply for internal promotions following your probationary period.

🏆 Monthly, Quarterly and Annual awards with marvelous prizes.

💆‍♀️ Resources such as the Employee Assistance Program (EAP) and Mental Health First Aiders to support you when life might not be going quite as you expected.

🌳 Receive a tree in the Sigma Forest when you pass probation. This will allow you to review how your tree is reducing your carbon footprint.

📁 Medical Insurance – Covers doctor visits, optometrist appointments and dental assistance, funeral cover, Group Life Cover.

💻 Join communities and collaborate with your colleagues on our internal Social Media platform.

💙 The opportunity to be a part of an equal, diverse, and inclusive workplace – all amazing people are welcome in the Sigma Family.

A bit more about the Opportunity...

What Your Day-to-Day Will Look Like:

💻 As an Executive Assistant to join our dynamic team supporting senior stakeholders at a London based leading private equity firm. This is an excellent opportunity for a skilled EA who thrives in a fast-paced, international environment and enjoys complex diary management across multiple time zones.

• Provide exceptional support to senior professionals, managing their busy calendars with precision, coordinating extensive travel arrangements including flights, accommodation and ground transportation, and ensuring seamless scheduling across UK and international locations
• Pivotal in maintaining smooth operational workflows, managing competing priorities, and ensuring that senior team members are equipped to focus on strategic initiatives
• Involve proactive calendar management, liaising with internal and external stakeholders to arrange meetings, managing travel itineraries that often require last-minute adjustments, processing expenses, and maintaining strong working relationships with both the executives you support and the wider EA community
• Highly organised with exceptional attention to detail, able to prioritise effectively in a demanding environment, and confident working across different time zones
• Role requires flexibility with working hours to accommodate PDT business hours (typically 19:00-04:00 SA time during West Coast winter and 18:00 –03:00 during West Coast Summer), strong communication skills to liaise professionally with high-level stakeholders, and the ability to remain calm and solution-focused when managing competing priorities and urgent requests
• Report directly to the EA Team Manager

This is a fantastic opportunity for an Executive Assistant who wants to work with a prestigious international client, develop their career within a supportive team environment, and make a real impact through excellent organisational support.

What amazing People will bring to the role

Who We're Looking For:

💡Confident team player who strives to deliver an exceptional service to all stakeholders.

• Required experience or qualification in the field and apply your knowledge and skills with a pragmatic approach, always considering both people and commercial impacts
• Challenge the status quo, and you are always looking for opportunities to add value, create efficiencies and positively improve business KPI’s

Requirements:

• 5-10 years' experience as an Executive Assistant or in a similar administrative/executive support role, ideally within the Investment, Financial Services, or Private Equity sectors
• Experience supporting senior leadership or managing multiple high-priority tasks and projects simultaneously is highly advantageous
• Proven experience working across multiple time zones to manage out-of-hours support for senior team members is advantageous
• Salesforce or equivalent CRM experience (desirable, but not essential)
• Familiar with Slack and Expensify: Advantageous
• Proficient in Microsoft Office Suite (Word, Excel, PowerPoint, and Outlook) and virtual meeting platforms (Zoom, Teams, etc.)
• Exceptional written and verbal communication skills (English)
• Working knowledge of managing complex schedules, including coordinating meetings, travel arrangements, and events (Essential)
• Proven ability to anticipate needs and proactively find solutions, making sound decisions in high-pressure situations with minimal supervision
• Customer-oriented mindset, proactively identifying the need of individuals and teams and providing solutions that align with their goals
• Working knowledge of project management methodologies and tools (e.g., Asana, Trello, or similar)
• Provide remote administrative and operational support to the San Francisco office
• Coordinate local vendors, office supplies, facilities, and other office requirements remotely
• Organise team events and lunches, including bookings and logistics
• Support office-related invoices and administration, liaising with Finance as required
• You will be aligned with US West Coast business hours 09:00–18:00 (19:00-04:00/ 18:00-03:00 SA time, depending on daylight savings), with an additional requirement to provide remote after-hours support when needed. The role will observe US public holidays instead of South African public holidays

Why This Role?

This isn't just another Executive position.

It's an opportunity, shape strategy, influence business decisions, and make a significant commercial impact within one of South Africa's most exciting BPO businesses.

If you're ready to take ownership, drive performance and build something exceptional, we'd love to hear from you.

Join the Sigma Family.

📩 Apply today and help us #ImproveEverythingAlways.