Head of Buyer Development, UK at Index Exchange – London

About Index Exchange:Index Exchange is a global advertising supply-side platform enabling media owners to maximize the value of their content on any screen. As a trusted partner and ally, we connect leading experience makers with the world’s largest brands to ensure a quality experience for consumers.
We’re a proud industry pioneer with over 20 years of experience accelerating the ad technology evolution. With our radically transparent business practices and dedication to total market efficiency, we’re committed to upholding the integrity of the programmatic ecosystem at large.
What’s it like to work at Index?Index is an exciting and fast-paced place to work. You'll be able to feed your ambition, lean into trust and transparency, and feel genuine support from your colleagues. We’re built on our core values and live them each day. They're‌ not just buzzwords.
We pride ourselves on our independence and openness, not only in our technology, but in our teams, too. Our diverse and inclusive culture celebrates how we can leverage our unique differences to help drive Index forward.
We have more than 550 Indexers around the globe dedicated to building a safe and transparent marketplace that provides a trusted experience for consumers, and we’re looking for talented professionals to help take us to the next level.
Are you ready to join the programmatic evolution?Index Exchange is looking for a Head of Buyer Development, UK to lead our buy-side strategy and partnerships across the UK market. Based in London, this role will own relationships with agency holding companies and lead a high-performing Buyer Development team focused exclusively on holdco engagement.
This is a senior, hands-on leadership role responsible for driving revenue growth, deepening strategic partnerships across holding company structures, and expanding adoption of Index’s buyer-facing products and marketplaces. You will play a central role in shaping Index’s UK buyer strategy and strengthening our position as a trusted, consultative partner to the agency ecosystem.
What we’re looking for:

• Strategic and commercially driven: You bring a strong understanding of UK agency holding company operating models, investment frameworks, and SPO dynamics, and can translate market insight into clear commercial strategy.
• People leader: You have experience leading, coaching, and developing senior commercial talent, setting clear expectations and driving accountability across your team.
• Collaborative: You work closely with Account Management, Operations, Product, and Publisher teams, acting as the internal owner of UK holding company relationships and ensuring alignment across the business.
• Credible and consultative: You are comfortable engaging senior stakeholders across agency holding companies, from programmatic and trading leads through to investment and commercial leadership.

Here’s what you’ll be doing:

• Own and grow senior-level relationships with UK agency holding companies
• Lead and develop the UK Buyer Development team, setting strategy, priorities, and performance expectations
• Drive revenue growth, marketplace adoption, and long-term partnership value across UK holdco accounts
• Act as a trusted advisor on SPO, marketplace quality, curation, data activation, and supply innovation
• Take responsibility for UK market performance, partnership health, and commercial outcomes
• Identify new demand opportunities within holding company structures and operating agency networks
• Oversee forecasting, reporting, and quarterly business reviews with internal and external stakeholders
• Partner with Product teams to provide structured market feedback and influence roadmap priorities
• Track UK buy-side trends and competitive dynamics, sharing insights with senior Index leadership
• Represent Index Exchange at industry events and senior partner forums in the UK

Here's what you need:

• 12+ years of experience in digital advertising, with deep expertise in programmatic (SSP, DSP, exchange, PMP, agency trading desk, etc.)
• Strong understanding of the UK agency holding company landscape and buying models
• Proven success in senior buyer-facing commercial roles within ad tech or programmatic environments
• Experience leading and developing commercial teams
• Confidence presenting technical and strategic concepts to senior stakeholders
• Professional working proficiency in English

Why you’ll love working here:

• Comprehensive health, dental, and vision plans for you and your dependents
• Paid time off, health days, and personal obligation days plus flexible work schedules
• Competitive retirement matching plans
• Equity packages
• Generous parental leave available to birthing, non-birthing, and adoptive parents
• Annual well-being allowance plus fitness discounts and group wellness activities
• Employee assistance program
• Mental health first aid program that provides an in-the-moment point of contact and reassurance
• One day of volunteer time off per year and a donation-matching program
• Bi-weekly town halls and regular community-led team events
• Multiple resources and programming to support continuous learning
• A workplace that supports a diverse, equitable, and inclusive environment – learn more here

Equal employment opportunityAt Index Exchange, we believe that successful products are built by teams just as diverse as the audience who uses them. As such, we are committed to equal employment opportunities. We celebrate diversity of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity or expression, or veteran status. Additionally, we realize that diversity is deeper than any status or classification—diversity is the human experience. For those who show grit, passion, and humility—Index will welcome you.
Accessibility for applicants with disabilities Index Exchange welcomes and encourages individuals with disabilities to apply to work with us.
If you require an accommodation, please share the details of your request and any information how we can assist you with the hiring recruiter when they contact you. Index Exchange will make reasonable efforts to ensure accommodation requests are met throughout the recruitment process.
Index everywhere, Index anywhereOur corporate headquarters are in Toronto, with major offices in New York, Montreal, Kitchener, London, San Francisco, and many other global cities. As a major global advertising exchange, we are committed to operating as a tightly knit global team and embracing and empowering talent wherever our colleagues may be.