Do ecommerce brands still need an in-house eCommerce or marketing leader if they outsource execution to agencies?

Yes, and arguably more than before. Agencies are built to execute within a specific channel, whether that is paid media, retention, or marketplace management, but none of them are positioned to see the whole business or own accountability for how the pieces fit together. The brands that get the most out of an agency roster are the ones with a strong internal leader setting the strategy, allocating budget across partners, and holding each agency to a shared definition of success.

What is the difference between a full-service ecommerce agency and a single-channel vendor?

A single-channel vendor typically handles one discipline well, such as Meta media buying or email flows, and brings in outside partners or asks the client to coordinate everything else. A full-service or integrated agency handles several connected functions, like paid media, creative production, and retention, under one team so the data and strategy do not get lost at each handoff. Neither model replaces the need for an internal owner who understands the brand's margins and priorities well enough to direct the work.

How many agencies does a typical eCommerce or DTC brand work with at once?

It varies by size and maturity, but it is common for a growing DTC or eCommerce brand to have separate partners for paid media, retention or lifecycle marketing, marketplace management, and SEO or content, sometimes with a fifth relationship for analytics or measurement. Larger brands consolidate some of this under fewer, broader agencies, while smaller brands often accumulate several specialized vendors over time without a clear internal owner coordinating them.

What should a hiring manager look for in the internal hire who will direct outside agencies?

Look for someone who has actually managed agency relationships before, not just consumed agency reporting. That means experience setting KPIs an agency cannot grade its own homework on, comparing results across channels using a shared metric like blended CAC or marketing efficiency ratio rather than each agency's preferred platform number, and being comfortable pushing back on a partner's recommendation when it does not serve the broader business.

Is hiring multiple specialized agencies a sign that a company does not need to hire in-house?

It is usually the opposite signal. A roster of specialized agencies means tactical execution is covered, which frees up the internal hire to focus on strategy, budget allocation, and cross-channel accountability rather than day-to-day campaign management. Companies that lean hardest on outside agencies without a strong internal owner are the ones most likely to end up with fragmented reporting and agencies quietly working against each other.

The eCommerce Agency Stack in 2026: What Brands Outsource, and Who Should Run It

Global ecommerce sales are on pace to top $7.9 trillion in 2026, and almost none of the brands driving that number are running every function in-house. It is now normal, not exceptional, for an eCommerce or DTC brand to have a paid media agency, a separate retention or lifecycle partner, an Amazon or marketplace specialist, and an SEO or content shop all working at the same time. The tactical execution of ecommerce marketing has become genuinely outsourced.

That shift raises a question we hear constantly from clients building out their team: if the agencies are handling the day-to-day execution, what exactly does the internal hire need to do? The answer, consistently, is that agencies are built to execute within their own channel, not to own the business outcome across all of them. Someone inside the company still has to decide what to outsource, hold each partner accountable to the same number, and catch it when three agencies are quietly optimizing for three different goals.

The Modern eCommerce Agency Stack

Most growing eCommerce and DTC brands are now piecing together agency support across a handful of recurring categories rather than hiring one generalist shop for everything. Full-stack agencies exist, but even the strongest full-stack partners tend to have real depth in two or three disciplines and a thinner bench everywhere else. Here is how that stack typically breaks down, along with agencies that are frequently cited across the space for each function.

Function	What It Covers	Agencies Commonly Cited
Paid Media & Performance Creative	Meta, Google, and TikTok media buying paired with high-volume creative testing	Common Thread Collective, Power Digital, Structured
Retail Media & Marketplace	Amazon, Walmart Connect, Target Roundel, and TikTok Shop management	Tinuiti and other Amazon-focused specialists
Retention & Lifecycle	Email and SMS flows, segmentation, and Klaviyo-based revenue programs	Boutique lifecycle and Klaviyo partner agencies
SEO, Content & AEO	Technical SEO, organic content, and visibility in AI search and shopping tools	Inflow and other SEO-first specialists
Outsourced CMO / Full-Stack	A la carte access to multiple disciplines without a full annual retainer	Hawke Media
Analytics & Measurement	Incrementality testing and unified reporting across every paid channel	WITHIN

Why Outsourced Execution Raises the Stakes on the Internal Hire

1. Agencies Optimize Their Channel, Not Your Whole Business

A strong paid media agency is judged on paid media performance. A strong retention agency is judged on email and SMS revenue. Neither one is positioned, or incentivized, to notice that the retention flows are cannibalizing paid conversions, or that a marketplace push is quietly training customers to wait for Amazon discounts instead of buying direct. That kind of cross-channel judgment has to sit with someone internal who can see the whole P&L, not just one line of it.

2. Without an Internal Owner, Agency Sprawl Becomes Its Own Cost Center

It is common for a brand to accumulate four or five specialized agency relationships over a couple of years without anyone ever stepping back to ask whether all five are still needed, whether their reporting even uses the same definitions, or whether two of them are unknowingly bidding against each other in the same auction. Left unmanaged, agency sprawl quietly becomes as expensive as an overbuilt internal team, just harder to see on an org chart.

3. The Best Internal Hires Make Agencies More Effective, Not Redundant

The strongest VPs and Directors of eCommerce we place do not view their agency roster as a threat to their own value. They treat it as leverage. A good internal leader briefs agencies with real business context instead of a generic creative brief, sets KPIs the agency cannot grade using only its own platform's numbers, and pushes back on recommendations that optimize for the agency's convenience rather than the brand's margin. That kind of oversight is exactly what separates a brand getting real value from its agency spend from one that is simply paying five invoices a month.

A quick gut check

"Who inside our company actually owns the relationship with each of these agencies, and who is accountable when their individual numbers don't add up to the same growth story?"

If the honest answer is that no single person owns that view across every agency, that is usually a stronger signal that you need a dedicated internal leader than a signal that you should cut agency spend.

This is also where a lot of interview processes go wrong. It is easy to hire someone who can competently manage one agency relationship, because that is a common enough skill. It is harder to find someone who has actually directed a multi-agency stack, reconciled conflicting reporting, and made the call to fire a partner that was underperforming relative to its cost. That is a different, more senior skill set, and it is worth screening for directly rather than assuming a strong resume implies it.

Agencies execute the plan. The brands growing fastest right now are the ones with one strong internal leader making sure every agency's plan actually adds up to the same number.

Putting It Together

Building out an agency stack is often the right move for tactical execution, but it does not remove the need for a strong internal owner, it makes that hire more important. If you are still working through who inside your organization should hold that responsibility, our post on who should own eCommerce is a useful starting point, and our breakdown of Manager vs. Director vs. VP can help you figure out what level that ownership needs to sit at given your current agency spend and complexity.

If your team is not quite ready for a full-time leader but already has real agency spend that needs direction, a fractional eCommerce leader is often the right bridge. And if the agency stack has grown to the point where leadership is asking whether it is time for a dedicated hire, our post on the signs you need a VP of eCommerce walks through the indicators worth watching for. If you would rather just talk through your specific situation, reach out directly.