Executive Assistant

Job Overview

We are seeking a highly strategic, operationally minded Executive Assistant to serve as a trusted partner to a member of our C-Suite Executive Committee (ExCo).

This is more than a traditional EA role—you will operate as a true extension of the Executive, 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.

Key Responsibilities

1. Strategic Time & Workflow Optimization

• Calendar Mastery: Proactively manage complex, multi-time zone calendars, “living in the schedule” to strategically build time for internal alignment, strategic thinking, and leadership duties.
• Proactive Planning: Anticipate needs several steps ahead, proactively adjusting commitments, and ensuring the Executive is fully prepared with all necessary materials (pre-reads, briefs, agendas) before every engagement.
• Travel & Logistics: Seamlessly plan and execute complex domestic and international travel, including multi-city itineraries, logistics, and comprehensive expense reporting/compliance.

1. Communication & Stakeholder Management

• Executive Representation: Act as the confident, professional, and primary point of contact for the Executive with internal teams (eg, Sales, Legal, Finance, HR) 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 Executive’s organization.

1. Operational Partnership & Business Acumen

• Trusted Partnership: Operate with absolute discretion and confidentiality, quickly learning the Executive’s preferences, decision-making patterns, and communication style.
• Business Context: Understand the Executive’s 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.

Essential Skills & Qualifications

• 7+ years of progressive Executive Assistant experience, including direct support of a C-suite or senior executive.
• Proven success managing highly complex, fast-moving, global calendars and workflows.
• Experience operating in dynamic, high-growth, or high-performance environments (Tech, SaaS, or Finance background preferred).
• Ability to work in-office 3-5 days per week in London.

The Ideal Partner: Traits & Competencies

• 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.
• 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 stacks (eg, Google Workspace, Outlook, CRMs, Concur/Expensing systems).

Our benefits include:

• Health & Wellness: Health care coverage designed for the mind and body.
• Flexible Downtime: Generous time off helps keep you energized for your time on.
• Continuous Learning: Access a wealth of resources to grow your career and learn valuable new skills.
• Invest in Your Future: Secure your financial future through competitive pay, retirement planning, a continuing education program with a company-matched student loan contribution, and financial wellness programs.
• Family Friendly Perks: It’s not just about you. OSTTRA has perks for your partners and little ones, too, with some
• best-in class benefits for families.

About OSTTRA

Launched in 2021, OSTTRA unites four businesses that have been at the heart of post-trade evolution and innovation for over 20 years: MarkitServ, Traiana, TriOptima and Reset.

With an outstanding track record of developing and supporting critical market infrastructure, our combined network connects thousands of market participants to streamline end t…