Commercial FP&A Business Partner in London

OSTTRA is seeking a highly motivated and commercially astute Financial Planning & Analysis (FP&A) Business Partner to join our London-based Finance department. Operating within a dynamic, Private Equity-backed environment, this role is situated on the commercial side of the organization, partnering directly with Product Owners and senior leadership. The successful candidate will provide the analytical rigor and strategic financial insights required to inform critical business decisions. This position offers a unique opportunity for an ambitious professional to contribute significantly to the evolution of the broader FP&A function into a "Best-in-Class" operation. The post holder must be equipped to handle complex analytical requests, adapt rapidly to changing business needs, and deliver high-quality outputs under stringent deadlines.

Responsibilities and impact:

• Strategic Business Partnering: Serve as the primary financial liaison for designated Product Owners, guiding commercial strategy through robust data analysis and comprehensive financial modeling.
• Executive Stakeholder Management: Confidently articulate and present complex financial findings, trend analyses, and strategic recommendations to senior leadership, including members of the Executive and Management Committees.
• Advanced Data Analysis & Remediation: Utilize highly advanced Microsoft Excel functionalities to navigate complex datasets, identify operational discrepancies, conduct trend analyses, and facilitate effective problem resolution.
• Agile Financial Output: Manage and execute ad-hoc, time-sensitive analytical requests characteristic of a Private Equity-backed structure, ensuring the delivery of accurate, high-fidelity outputs that drive immediate business value.
• Process Optimization & Innovation: Identify and implement operational efficiencies to enhance both the velocity and quality of the team’s deliverables, demonstrating a proactive interest in integrating AI and automation into existing finance workflows.
• Cross-Functional Collaboration: Actively engage in broader Finance initiatives, including cross-regional collaboration with the US-based management team and presenting strategic insights at departmental forums and All-Hands meetings.

What we’re looking for:

We are seeking a highly engaged professional eager for strategic career advancement and possessing the acumen to manage high-level commercial relationships. The ideal candidate is an upwardly mobile individual equipped to handle complex stakeholder dynamics and drive actionable business results.

Experience & Educational Background

• Professional Experience: Approximately six (6) years of demonstrable experience within a highly numerical, analytical, or financially focused role. Previous experience managing external client relationships or advising senior business stakeholders is highly advantageous.
• Education & Certifications: While a formal accounting degree or qualification (e.g., ACA, ACCA, CIMA) is not a strict prerequisite, the candidate's professional background must clearly evidence exceptional quantitative agility and advanced analytical capabilities.
• Advanced Excel Capabilities: Exceptional proficiency in Microsoft Excel, encompassing the creation, navigation, and troubleshooting of complex financial spreadsheets and formulas.
• Data Visualization & Reporting: Strong capability in translating dense data sets into clear, compelling narratives, ensuring findings are effectively communicated both verbally and through polished financial reporting.
• Technological Acumen: A forward-looking mindset with an active interest in technological advancements, including AI and process automation, to continuously modernize the finance function.

Professional Attributes

• Executive Presence: Possesses the professional gravitas and communication skills necessary to engage effectively and build consensus with C-suite executives, senior internal stakeholders, and external partners.
• Adaptability & Resilience: Thrives in a fluid, high-velocity environment, demonstrating the cognitive agility to pivot priorities seamlessly and execute with precision under pressure.
• Proactive Initiative: Exhibits a high degree of self-motivation and a proactive approach to problem-solving, consistently anticipating business needs and demonstrating readiness to execute effectively from day one.
• Continuous Development: A dedicated professional demonstrating a clear trajectory of continuous improvement, seeking a challenging environment to accelerate their strategic career progression and elevate the standards of the broader team.

The location: London, United Kingdom

Right to work requirements: This role is limited to persons with indefinite right to work in the UK.

Our Benefits: Global vision, local impact. 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. No matter your location, you are part of a culture that prioritises your holistic well-being.
• 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.

The Trust employee ownership plan: 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.

About OSTTRA: 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.

Equal opportunity employer statement at OSTTRA: 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. By valuing different perspectives and promoting a culture of respect and collaboration, we drive and operate the infrastructure that the world’s post-trade financial system runs on.