Digital commerce agency: what the work covers and how to scope it

A digital commerce agency builds and runs the system a business sells through online: the storefront platform, the product data behind it, the checkout, the integrations out to inventory and finance, and the merchandising and retention work that raises revenue per visit. Almost every firm using the name is strongest at one of three jobs: platform implementation, commerce growth, or commerce operations. Work out which of the three you are buying before the first call, because the firm that replatforms you well is rarely the firm that runs your email programme.

The label spread because "ecommerce agency" stopped describing the work. Selling online now involves an order management system, a tax engine, a payment stack, a subscription or business to business pricing layer, a marketplace presence and a retention programme. That is systems work with a revenue number attached, and it needs a different kind of supplier from the one that runs your paid social.

The three kinds of firm sold under one name

Kind	What they actually do	Buy them when
Platform implementation	Build or replatform the storefront. Theme and front end work, data migration, integrations to ERP, order management, product information management, tax and payments, testing and go live.	You are moving platforms, launching a new region or storefront, or your current build blocks the roadmap.
Commerce growth	Traffic and conversion against revenue: acquisition, on site merchandising, product page quality, lifecycle email and SMS, retention and repeat rate.	The store works and the constraint is demand, average order value or repeat purchase.
Commerce operations	Catalogue and product data, pricing and promotion setup, marketplace listings, fulfilment logic, returns flow, reporting hygiene.	Your range is large or changes often, or your team is buried in catalogue admin.

A handful of larger firms genuinely do all three, with separate teams. Ask which team is doing your work and who leads it, because that is the answer that matters.

What commerce includes that a general marketing agency does not touch

• Product data. Titles, attributes, variants, images, specifications and taxonomy. This is the single biggest determinant of whether anything else works, on your own site search, in shopping feeds and in an assistant's answer.
• Order and inventory systems. Stock accuracy, split shipments, backorder rules, warehouse routing. Oversold stock destroys more margin than most ad accounts earn.
• Payments and checkout. Wallets, local methods, instalments, fraud rules, failed payment recovery. Each one is a conversion lever and a finance decision at the same time.
• Tax and compliance. Multi state or multi country tax, invoicing rules, product restrictions, accessibility and consent requirements.
• Pricing complexity. Subscriptions, bundles, customer specific trade price lists, quote to cash.
• Marketplaces and distribution. Large marketplaces, retailer dot com partners, regional platforms, and the question of how each one relates to your own store's pricing.

A build engagement and a growth retainer are different contracts

Mixing them is the most common way these relationships go wrong. A build has a scope, a date and an acceptance test. A retainer has a cadence and a direction. Write them as two agreements even with the same supplier.

• Build: fixed discovery, then milestone based delivery. Deliverables are named: data model, integration specification, redirect map, test plan, documentation, handover session, defect window after launch.
• Growth: monthly or quarterly, with a named revenue constraint for the period, a test backlog, and a review that compares what shipped against what was planned.

Scoping a replatform without losing revenue

Replatforming is the highest risk thing a commerce agency will do for you. The work that protects revenue is unglamorous and should be visible in the proposal.

• Discovery first, priced separately. Current state audit, data quality assessment, integration inventory, and a written build specification you own whether or not you continue with that firm.
• A URL map and redirect plan. Every indexed page on the old store mapped to a destination on the new one, including the filtered and paginated pages you intend to drop.
• Data migration with reconciliation. Products, variants, customers, order history, subscriptions and store credit, with counts checked on both sides.
• A content and template freeze before go live, so the thing you tested is the thing you launch.
• A rollback position. What happens if checkout conversion drops on day two, and who decides.
• Post launch monitoring on conversion rate by checkout step, error rates, template page speed and indexation of the new URLs.

How to judge a digital commerce agency

Portfolios all look good. These questions separate firms quickly.

• Which platforms do you deploy most often, and how many of those builds are still live two years on?
• Show the redirect map and the migration reconciliation from a recent replatform, with the client details removed.
• Who writes the code, where do they sit, and who is on the call when something breaks during a peak trading hour?
• Do we own the repository, the theme code and the documentation at the end?
• What integration did you build that you would do differently now?
• For growth work: what is the first thing you would change on our product pages, and why that first?
• How do you handle peak trading, and what is frozen during it?

How the commercial side is usually structured

• Fixed fee discovery, a few weeks, ending in a specification. The cheapest way to test whether a firm thinks clearly.
• Milestone build, paid against accepted deliverables rather than elapsed time.
• Monthly retainer for growth or operations, with a stated capacity and a stated scope.
• Revenue share or performance fee. This works where the agency controls most of the inputs, and is worth checking carefully where it does not.

Send the same written brief to three firms of different sizes. The differences in how they interpret it tell you more than their rate cards do.

This page covers choosing and scoping a digital commerce agency. For the separate question of which platform to move to, run that as a technical selection with your own engineering and finance people in the room, because the answer turns on your catalogue, your order volume and your back office.

What people ask about digital commerce agency

What is the difference between a digital commerce agency and a digital marketing agency?

A digital marketing agency is accountable for demand: traffic, leads, campaign performance. A digital commerce agency is accountable for the selling system as well, including the platform, the product data and the integrations that decide whether an order can actually be fulfilled. If your constraint sits inside the store rather than in front of it, you need the commerce firm.

Do we need an agency if we are on a hosted platform?

Hosted platforms remove server work, not commerce work. Teams usually bring in help for the initial build, for an integration to an ERP or warehouse system, for complex pricing or subscriptions, and for growth work once the store is stable. Day to day merchandising is very manageable in house.

How long does a replatform take?

Scope the timeline from three things: the number of integrations, the state of your product data, and how many people have to approve content. Data quality is usually the long pole. Cleaning the catalogue before the build starts shortens the project more than any other single decision.

Should one firm do both the build and the growth work?

It works well when the firm has distinct teams and you hold separate contracts, because the build team is then measured on delivery and the growth team on revenue. It works badly when one small team does both, since the growth work quietly turns into maintenance.

What should we keep in house?

Keep the commercial decisions and the knowledge that compounds: pricing, range, brand, the customer list and the analytics definitions. Buy capability in bursts, such as a build, a migration or a specialist channel.

One thing worth checking before you sign

Ask each shortlisted firm what a shopper sees when they put your category question to ChatGPT, Gemini, Perplexity, Claude or Google's AI Overviews. Product research increasingly starts there, and those answers are assembled from product data, retailer pages, review sites and comparison content rather than from your ad account.

The five answer differently, name different brands and cite different sources, and they share no common ranking, so a strong showing in one says nothing about the rest. It is a fast way to see which firms are paying attention to where discovery is moving. Run the check yourself first, using a buyer's real wording and leaving your brand name out of the prompt so the answer stays clean. AI Knows Us measures that and shows which sources the answers were built from.