Business Director

Business Unit:
Performance: We help globally ambitious brands turn visibility into measurable growth – appearing where it matters, when it matters, to the people who matter most

Team: Client Services

Reporting to: Client Partner

Location: London / hybrid

GAIN is a creative-led, insight-driven company that blends data, tech, and creativity. We believe the best ideas emerge where intelligence and creativity unite, where insight sparks imagination, and where innovation turns possibility into progress.

We are explorers of new frontiers, shaping bold strategies that move people, brands, and businesses forward. Individually and together, our specialist teams provide the vision, data, and confidence brands and organisations need to make braver, more impactful decisions.

Today as GAIN, we work as a united force, using data to fuel creativity, and technology to unlock new possibilities. As imagineers we don't just embrace innovation - we engineer it, transforming information into action, and ideas into breakthroughs.

This is where rebel thinking, smart technology, and data-driven creativity shape the future. Through our five specialist teams:
Creative Studio, Conversion, Customer Science, Experience, and Performance, we work to fuel brand growth and deliver measurable impact.

As a Business Director, you are a senior leader driving one of GAIN's newest and most strategically important accounts – a high potential land and expand opportunity with the foundations already in place for huge growth. You will be accountable for successfully onboarding the client, establishing the right cadence and senior relationships, deeply understanding their ways of working, and defining what success looks like for both sides.

This role requires an experienced senior leader who combines commercial sharpness, operational excellence, and strong performance marketing & digital expertise. Reporting to the Client Partner, you will act as a trusted senior advisor to the client while also shaping the long‑term strategic direction of an account with immediate and significant growth potential, including partnerships and cross‑portfolio opportunities.

You will build and lead a high‑performing team responsible for delivering outstanding work, cultivating deep client trust, and expanding GAIN's remit. This is a rare opportunity to shape a flagship relationship from day one, creating the foundations, setting the tone, and steering its evolution into a major portfolio.

Senior client leadership & relationships

• With the Client Partner, lead the onboarding and establishment of this new strategic account, setting the relationship and delivery foundations for long‑term partnership and growth
• Build deep, trusted connections with senior stakeholders, developing a clear understanding of their business model, priorities, decision‑makers, and ways of working
• Set the relationship cadence (governance, rituals, communication standards) that ensures clarity, momentum, and transparency from day one
• Act as a senior strategic partner to the client, providing proactive counsel across performance marketing, digital strategy, and broader communications
• Anticipate client needs, challenges, and growth areas shaping solutions before issues arise and positioning GAIN as indispensable
• Represent GAIN with authority and confidence in all senior interactions, establishing our credibility as a long‑term partner from the outset

Portfolio ownership & strategic direction

• Responsibility for the strategic direction, performance, and future growth of this developing portfolio
• Define and evolve the strategic roadmap for the account, ensuring all work is insight‑driven, effective, and aligned to client ambitions
• Serve as the organisation's senior voice of the client, ensuring agency teams remain close to the client's real commercial and category challenges
• Identify and drive organic growth opportunities across performance media, digital experience, content, creative and measurement
• Lead expansion conversations with sister agencies and cross network partners, shaping a unified and scalable growth strategy
• Support new business efforts informed by early successes…