Senior Media Buyer (Meta + TikTok) - Agency

Media Stack is a network of ecommerce specialists with 50+ years of combined experience across paid media, creative strategy, and CRO. We work with ambitious consumer brands across fashion, beauty, and wellness, and we're building a team of people who take genuine ownership over their work and care about the results as much as our clients do.

The Role

We're looking for a Senior Media Buyer to take the lead across a number of paid social accounts at Media Stack. This is a full-time, remote role for someone who is as comfortable in the data as they are in a client call — and is able to lead and craft the creative strategy.

You'll be managing and scaling campaigns across Meta and TikTok for a portfolio of ecommerce clients, working closely with our in-house Creative Strategist, and helping shape how the paid media function operates at the agency. This is a leadership role as much as an execution role.

What You'll Be Doing

• Planning, executing, and optimising paid social campaigns across Meta, TikTok, and other paid social channels
• Collaborating closely with our in-house Creative Strategist — you'll be the key performance input, feeding data-driven insights into the creative process to inform what gets made and tested next
• Leading on creative strategy from a performance perspective — analysing what's working, identifying winning angles, and briefing creative on hooks, formats, and messaging
• Owning client relationships directly — communicating performance clearly, proactively flagging issues, and building trust
• Forecasting, budget pacing, and reallocation across accounts to maximise performance
• Setting up and interpreting A/B tests across creatives, audiences, and bidding strategies
• Applying attribution modelling knowledge to reporting and client-facing analysis
• Contributing to how the paid media department is built and run

What We're Looking For

• 7+ years managing paid social campaigns, primarily Meta and TikTok
• Proven track record with ecommerce consumer brands — fashion, beauty, and/or wellness
• Strong analytical ability — attribution modelling, ROAS, CAC, funnel dynamics
• A genuine creative strategist — you understand why an ad works, not just whether it does
• Direct client-facing experience — you're transparent, articulate, and proactive
• Someone entrepreneurial — if you've run your own venture at some point, even better
• Advanced in Excel or Google Sheets for reporting and analysis
• Familiarity with Motion (creative strategy tool) — not a hard requirement, but a strong preference
• Comfortable working independently in a remote environment
• Agency experience is a strong plus; brand-side experience also valued
• Someone that is always looking to improve process efficiencies.
• AI native to support with work.

You’ll Thrive Here If You

• Want to own a channel, not just execute on it
• Have strong opinions about creative and can back them up with data
• Are energised by fast-moving ecommerce environments
• Treat clients like partners, not accounts
• Are naturally entrepreneurial and take initiative without being asked

Interview Process

You'll be asked to complete a full account audit of one of our client accounts as part of the process.