Performance Media Manager in London

An opportunity has arisen for a Performance Media Manager role for a permanent, full-time basis. Are you excited to work in a fast-paced, dynamic environment? Do you have the skills and passion to build brand awareness, engagement, and conversion? Are you ready to be innovative, challenge the status quo, and build new capabilities where you can see your impact every day?

At Glanbia Performance Nutrition (GPN), our mission is to inspire people everywhere to achieve their performance goals. As the global leader in sports nutrition — with brands including Optimum Nutrition (ON), Isopure, BSN, LevlUp, Nutramino, Amazing Grass and Think! — we are values-led and focused on sustainable business growth.

We’re seeking an ambitious, analytically driven Performance Media Manager to join our E-Commerce Centre of Excellence. In this role, you will not only execute best-in-class media campaigns but also shape a test-and-learn culture, challenge existing ways of working, and strengthen cross-functional alignment across Europe.

• Develop and execute full-funnel performance media strategies across paid search, paid social, display, programmatic, and affiliate channels — driving acquisition, engagement and revenue.
• Own day-to-day media activation and optimisation, ensuring efficient use of budgets and consistent delivery against commercial KPIs.
• Partner with local market e-commerce teams and brand teams to adapt strategies to regional needs, audiences, and trading priorities.
• Build a structured test-and-learn roadmap (creative, audience, bidding, landing page, format and platform tests).
• Challenge existing playbooks by identifying under-performing tactics and proposing new approaches based on data and market trends.
• Ensure campaigns support trading calendars, stock priorities, and commercial goals across all European markets.
• Monitor performance across media platforms, Shopify, and GA4, transforming data into actionable optimisation recommendations.
• Lead data-driven optimisation via audience segmentation, creative performance insights, and attribution learnings.
• Partner with Analytics to evolve dashboards, tracking accuracy, attribution modelling and reporting consistency across markets.
• Maintain responsibility for correct pixeling, tagging, and tracking infrastructure in collaboration with Analytics and Tech teams.
• Stay ahead of algorithm changes, new formats, automation opportunities and performance trends — ensuring GPN consistently evolves its media strategy.
• Work closely with CRM, SEO, Retail Media, Brand, Creative, and E-Commerce teams to ensure holistic go-to-market execution across channels.
• Partner with In-Market teams to align messaging, budgets, campaign timings, and audience strategies.
• Facilitate alignment sessions (weekly/monthly) to ensure performance learnings and recommendations flow across teams.
• Share insights and best practices across regions and functions to drive consistency and capability-building across Europe.

• Manage media agencies and platform partners (Google, Meta, TikTok, affiliates), ensuring clear objectives, accountability, and performance standards.
• Evaluate media partner performance, challenge assumptions, and push for continuous improvement.
• Ensure documentation of learnings, playbooks, media frameworks, and optimisation guidelines — helping scale performance marketing maturity across markets.
• Proactively identify new platforms, formats, tactics, and betas to fuel incremental growth.
• Test emerging channels (e.g., TikTok performance ads, YouTube automation, retail media formats) and build frameworks to scale successful experiments.
• Champion a culture of experimentation, ensuring hypotheses, test design, measurement windows, and success criteria are documented.
• Recommend changes to process, workflows, and reporting structures to increase efficiency and capability.

• 3–5 years of hands-on experience managing digital/performance media, ideally across Google Ads, Meta Ads, YouTube, Display/Programmatic, and Affiliates.
• Strong analytical mindset; proficiency with GA4, Looker Studio, Power BI, Google Ads, Meta Ads Manager, and tag/pixel management.
• Strong understanding of attribution, conversion tracking, bidding strategies, and media efficiency metrics.
• Experience managing agencies and evaluating partner performance.
• Strong communicator able to translate data into clear strategic recommendations for non-technical stakeholders.
• Highly collaborative with strong stakeholder management skills across creative, brand, trading, analytics, and market teams.
• Proactive mindset with a passion for testing, learning, challenging current ways of working, and driving continuous improvement.
• Ability to manage multiple projects and priorities in a fast-paced, rapidly evolving environment.

If you think you have what it takes, but don't necessarily meet every single point on the job description, please apply!

The opportunity will be based in with hybrid working arrangements available through our Smart working model which allows you a greater choice in how you work and live, giving you a better work-life balance.

The opportunity to develop your career on a global stage, continuous learning through an on-demand learning platform, and a competitive compensation package including staff discounts, generous family leave policy, health & dental plan, competitive salary.

The Glanbia Group comprises three divisions: Glanbia Performance Nutrition, Glanbia Nutritional's, and Joint Ventures. Collectively and with our partners we offer an incredible breadth of expertise in nutrition. We employ a team of 6,000 people, work with global food and beverage companies, and sell our award-winning and market-leading products in 130 countries worldwide.

At Glanbia, we celebrate diversity, because we know that our individual strengths make us stronger together. We welcome and encourage interest from a variety of candidates, we will give your application consideration, without regard to race, colour, religion, sex, sexual orientation, gender perception or identity, national origin, age, marital status, protected veteran status, or disability status. At Glanbia, our culture celebrates individuality, knowing that together we are more.