Exeuctive Assistant in London

We are seeking an Executive Assistant to provide administrative and diary support within a busy executive office, specifically to act as a trusted partner to several members of our Executive Management Committee (EMC). The role will be working alongside other experienced EAs, reporting directly into the EA to one of the Co-CEOs.

This is more than a traditional EA role—you will operate as a true extension of the Executives, responsible for ensuring their time, priorities, and workflow operate with maximum efficiency and strategic focus. You will act as the primary, professional "face" of the Executive, requiring exceptional judgment, strong business acumen, and the ability to operate with complete discretion in a dynamic, fast-paced global environment.

There is also the opportunity within this role for some other business partnering, for example event management support, social media support and internal communications support.

• Strategic Time & Workflow Optimisation
  • Calendar Mastery: Proactively manage complex, multi-time zone calendars, strategically building time for internal alignment, strategic thinking, and leadership duties.
  • Proactive Planning: Anticipate needs several steps ahead, proactively adjusting commitments, and ensuring the Executives are fully prepared with all necessary materials before every engagement.
  • Travel & Logistics: Seamlessly plan and execute complex domestic and international travel, including multi-city itineraries, logistics, and comprehensive expense reporting/compliance.
• Communication & Stakeholder Management
  • Executive Representation: Act as the confident, professional, and primary point of contact for the Executives with internal teams and external partners.
  • Correspondence: Draft, filter, and manage high-volume email and communication with exceptional clarity, adapting communication style to all levels of seniority.
  • Meeting Management: Attend key meetings to document decisions, capture action items, and ensure timely follow-ups across the Executives’ organisations.
• Operational Partnership & Business Acumen
  • Trusted Partnership: Operate with absolute discretion and confidentiality, quickly learning the Executives’ preferences, decision-making patterns, and communication style.
  • Business Context: Understand the Executives’ key priorities, strategic initiatives, and the broader organizational ecosystem to make smart, informed decisions independently.
  • Initiative: Identify bottlenecks, propose solutions, and take proactive initiatives to solve problems before they arise.

• 5+ years of progressive Personal or Executive Assistant experience.
• Proven success managing highly complex, fast-moving, global calendars and workflows.
• Experience operating in dynamic, high-growth, or high-performance environments.
• Ability to work in-office at least 3 days per week in London.

• Proactive by Default: Anticipates needs, solves problems early, and rarely requires direct instruction.
• Executive Presence: Acts with polish, confidence, and high emotional intelligence, serving as a professional ambassador.
• Personal Traits: Looking for someone friendly, sociable and collaborative who enjoys being visible, engaged and involved in office life.
• Communication Excellence: Exceptional written and verbal communication skills, including strong note-taking and documentation.
• High Discretion: Demonstrates an exceptionally high level of judgment and maintains absolute confidentiality on sensitive matters.
• Tech Savvy: Highly proficient across modern tech platforms.

At OSTTRA, our benefits philosophy offers a market-competitive package that reflects our position as an industry leader. We want to ensure you feel valued, secure, and empowered wherever you are in the world.

Our approach is built on three core pillars:

• Global foundations: We provide a baseline of excellence across all our offices, focusing on comprehensive Health & Wellness, Financial Security, and Work-Life Balance.
• Locally tailored: We benchmark in each market to ensure our packages are genuinely competitive where you live and work.
• Flexibility and growth: We empower you to work in a way that suits your life. This includes a hybrid working model, generous leave policies, and a commitment to your continuous professional development.

Every employee at OSTTRA is an owner, and a member of The Trust, our employee ownership programme. Our distinct culture encourages colleagues to think and act like owners and raise the bar constantly.

This plan reflects our belief that when we work together to build a stronger, more valuable organisation, then all colleagues should benefit from the value we create.

We build and operate the infrastructure that the world’s post-trade financial system runs on. Launched in 2021, we have unified more than 20 years of heritage and expertise from four industry leaders into a single, integrated business.

Today, we operate a trusted network that connects thousands of market participants to streamline end-to-end workflows, from trade capture through portfolio optimisation. We translate industry change into workable process, engineering an open, intelligent ecosystem that removes friction and reduces risk for the global markets.

Our distinct ownership culture is underpinned by four behaviours: boldness, curiosity, accountability, and collaboration. In 2025 we were acquired by KKR, one of the world’s most successful private equity firms, and are on a journey of growth and impact.

Joining our team now is a unique opportunity – you will help to shape the next generation of post-trade, transform shared infrastructure into shared benefit, and accelerate your own career.

We are committed to fostering a connected and engaged workplace where all colleagues have access to opportunities based on their skills, experience, and contributions. Our hiring practices emphasise fairness, transparency, and merit, ensuring that we attract and retain the best talent.