Agency vs. In-House: Where Marketers Actually Learn the Fundamentals

Introduction

Damien Voita, Principal Campaign Manager at AdRoll, has spent nine years in paid media and integrated campaign strategy, splitting that time between agency and in-house roles across B2B and B2C brands. AdRoll is a multicha el advertising platform that helps mid-sized brands run full-fu el, AI-powered campaigns across the open web. In a lightning-round close to a conversation about optimizing holiday media strategy, I asked him one question that every marketer eventually has to answer for themselves: which environment taught you more, agency or in-house? His answer, and the reasoning behind it, says a lot about how practitioners should think about their own development.

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Why Agency Wins as a Training Ground

Voita gave the edge to agency life, with a caveat. "It's not a place I would want to spend an entire career," he said, "but it is such a good trial by fire for getting into advertising." The value comes from exposure. Agency work drops you into customers and industries you would never encounter otherwise, and it does so repeatedly.

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Reps Build Fundamentals

The real benefit, in Voita's view, is that agency work forces a specific exercise over and over. Instead of acting as "just a digital marketer, an ad buyer," you have to ask what the right approach is for this particular company and what might need to change. Ru ing that exercise across dozens of clients is what builds durable fundamentals. It is a volume-of-reps argument, and it maps directly to how campaign managers get better at audiences, cha el mix, creative and measurement.

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The In-House Identity Trap

Voita also flagged a risk that comes with staying in-house too long. Marketers start to identify with the brand they work on rather than with their craft. "The best marketing work comes from people who really view themselves first and foremost as marketers," he said, "and then they approach the brand and think about how can I apply this whole toolkit." The order matters. Marketer first, brand second.

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My eBay Reality Check

I lived the other side of this. During my seven years at eBay, the logo on my polo meant budget, access and the assumption that I knew everything. None of that carried over when I left. I had to figure out how to actually be a marketer without the brand cachet doing the work for me. It is easy to win a football game when you are up big in the first quarter. The practitioners who get better are the ones who see different companies and get more reps, which is why I learned far more in consulting and agency work than I ever did in-house.

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What This Means for Your Career and Your Team

For individual marketers, the takeaway is to treat early-career agency time as an accelerator, not a destination. Seek the environments that force you to rethink the right approach for a new business, because that is where fundamentals form. For marketing leaders hiring and developing teams, look for people who hold their identity as marketers above their attachment to any single brand. Those are the practitioners who bring a full toolkit to the problem instead of a set of habits inherited from one company.

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Conclusion

Agency work teaches faster because it demands more reps across more contexts, and it keeps you honest about whether your skills or your employer's brand are doing the heavy lifting. In-house roles offer depth but carry a real risk of mistaking brand identity for marketing competence. Voita's advice is to stay a marketer first and apply that toolkit wherever you land. Mine is the same, with one addition: when the big logo comes off your chest, make sure you still know how to win. You can co ect with Damien Voita on LinkedIn or at adroll.com, and if you want a weekly stream of marketing and technology knowledge, subscribe to the MarTech Podcast in your podcast app or on YouTube.