Head of Commercial Finance - 6 Month Fixed Term Contract (London)

About us: We are champions of rail, inspired to build a greener, more sustainable future of travel. Trainline enables millions of travellers to find and book the best value tickets across carriers, fares, and journey options through our highly rated mobile app, website, and B2B partner channels. Now Europe’s number 1 downloaded rail app, with over 125 million monthly visits and £5.9 billion in annual ticket sales, we collaborate with 270+ rail and coach companies in over 40 countries. We want to create a world where travel is as simple, seamless, eco-friendly and affordable as it should be. At Trainline, we’re changing the way the world travels by rail and coach. And behind our platform sits a world-class Finance team, working hand-in-hand with the business to unlock growth, optimise investment, and fuel strategic decisions. We’re now looking for a sharp, commercially savvy Head of Commercial Finance to partner directly with the leadership of our B2B arm – Trainline Partner Solutions (TPS) . TPS is the fast-paced, entrepreneurial side of Trainline – building innovative rail tech for everyone from SMEs to major rail operators. Whether it’s through our Travel Managemet Company (TMCs) integrations, Trainline Business platform, or white-label solutions, TPS is making rail simpler, smarter, and more accessible for businesses across the UK and beyond. This is a senior interim role with big influence. You’ll be embedded in the strategy and budgeting cycle from day one, shaping the future trajectory of the business and bringing data-led insight to every conversation. From deal structuring to growth forecasting, you\’ll be at the heart of commercial decision-making – and a critical voice in our Finance leadership team. Strategic finance partnering: Act as the go-to finance partner for the TPS leadership team (VPs and Directors), challenging commercial thinking and helping shape the strategy from the ground up. Deal analysis & optimisation: Appraise new partnerships and renegotiations, balancing commercial creativity with a sharp eye on sustainable margins and shareholder return. Scenario planning & modelling: Build robust, flexible models that help leadership test outcomes and make confident investment decisions. Performance insight: Develop and deliver clear, actionable insights into segment performance, translating trends into strategic action. Be a compelling voice in senior forums – telling the story behind the numbers and helping shape the narrative for the Board. Commercial governance: Collaborate with Finance Control, Legal, and Commercial teams to ensure deal structures are viable, executable, and aligned with long-term goals. Data-driven impact: Help steer the Data Science roadmap by championing high-impact, business-critical projects. A strong background in commercial finance or business partnering , ideally within a high-growth, multi-stakeholder environment. Hands-on experience with budgeting, forecasting , and building financial business cases in a commercial setting. Comfortable navigating contract terms and deal structuring – or keen to build expertise fast. An analytical thinker with a passion for data , a love for commercial storytelling, and the ability to influence at all levels. A team-first leader – ready to mentor, coach, and help evolve the wider Finance team (no direct reports, but lots of influence). Enjoy fantastic perks like private healthcare & dental insurance, a generous work from abroad policy, 2-for-1 share purchase plans, an EV Scheme to further reduce carbon emissions, extra festive time off, and excellent family-friendly benefits. We prioritise career growth with clear career paths, transparent pay bands, personal learning budgets, and regular learning days. Think Big – We\’re building the future of rail ~️ Travel Together – We\’re one team ~️ We know that having a diverse team makes us better and helps us succeed. And we mean all forms of diversity – gender, ethnicity, sexuality, disability, nationality and diversity of thought.