What is Media Buyer?

A media buyer is the person who manages paid ad campaigns — setting up campaign structure, budgets, bids, targeting, and placements on platforms like Meta, TikTok, and Google, and optimizing spend against performance targets.

The mechanics

Day to day, media buyers launch and structure campaigns, monitor CPA/ROAS, reallocate budget between winners and losers, scale what works, and kill what doesn't. Platform automation (broad targeting, algorithmic bidding) has absorbed much of the old manual craft, shifting the modern buyer's leverage toward feeding the algorithm enough quality creative and reading the data to guide the next creative round. The best buyers now operate as testing-system managers.

Signals that matter

• Good: a disciplined testing structure where every ad's result feeds a documented decision
• Good: budget concentrates on proven creative while a steady test lane keeps searching
• Bad: constant panic edits to live campaigns that reset optimization and blur every readout

Putting it to work

A buyer's results now hinge on the creative pipeline behind them — an empty test queue means fatigue with no answer ready. Buyers who can generate new UGC-style variants inside Claude with Polaris the same day a fatigue signal appears keep accounts fed without waiting on production cycles. See the full ecommerce ads glossary, or put it into practice with the Polaris AI UGC ad generator.