A grocery chain knows who buys gluten-free bread every Tuesday. Search terms that end in abandoned carts. Same database. Data like this has value beyond merchandising, though most retailers never turn it into an ad product because the infrastructure is missing. Sponsored placements are the easy bit. Everything below them is where projects die. Inventory rules for ad slots. Targeting tied to loyalty tiers. Measurement that links impressions to sales. Billing against advertiser contracts.
Some build from scratch. Others extend what their marketplace or storefront already does. Internal engineering capacity decides which path makes sense, along with how much of the ad stack needs to sit inside the commerce system. This piece looks at four companies that handle retail media builds: Avenga, Admixer, Oxagile, Innowise.
1. Admixer
Admixer approaches retail media from a different starting point. The company already operates ad infrastructure that retailers can connect to instead of building every component from zero. Inventory management, brand-to-marketplace workflows, and automated placement logic come as working parts. Custom development gives more control. Admixer gives speed and a shorter path to a functioning ad operation.
The operational side is where Admixer concentrates. Campaign management, demand connection, reporting, and placement control run through the same system. A retail media network has to onboard advertisers, track spend, and produce performance data. Those pieces exist already.
The stack covers how a retailer manages its ad offering:
- Retail media advertising technology;
- Ad serving and campaign management;
- Advertiser access and demand integration;
- Inventory analytics and reporting.
Ready-made components reduce custom engineering effort. Fit depends on the retail platform. A grocery chain with a complicated loyalty program may need more adaptation than a marketplace with simple sponsored listings.
Admixer suits retailers that want working ad infrastructure without building each piece themselves. The existing system is the asset. Less flexibility in how components evolve is the cost.
2. Avenga
Avenga works on retail media infrastructure with a focus on first-party data. The retailer keeps transaction history, loyalty segments, and browsing signals inside its own environment. Avenga builds the layer that turns those assets into ad placements. Sponsored products, brand-facing ad cabinets, connections to existing e-commerce systems. A retailer does not hand its customer data to an outside ad network. The platform reads from the commerce database and writes back campaign results.
The engineering setup uses one team from build through post-launch development. That team owns architecture decisions, writes documentation, stays available when the retailer’s own engineers start modifying components. There is no relay between an implementation vendor, a support vendor, and a third company that inherits the codebase two years later.
A retail media platform is not a single application. It is a set of services that share data with the commerce system:
- Retail media platform development;
- Sponsored product advertising systems;
- First-party data integration;
- Self-service advertiser tools;
- Campaign analytics and attribution.
Control over the ad stack means the retailer decides which formats exist, how data flows between ad and commerce services, and what advertisers can see. The platform changes when the storefront changes, not six months behind.
Avenga’s advantage is not a specific technology. It is that the same engineering group builds the initial platform and continues developing it. Architecture does not get fragmented across contractors who never coordinate. One point of accountability for the entire ad stack, from the first sprint to the third year of production.
3. Oxagile
Oxagile has spent years on AdTech development and ad integrations. Retail media pulls that experience into a commerce setting. The relevant work is connecting ad systems to digital commerce products: ad delivery, targeting, measurement across different platforms. Oxagile does not claim specific retail media projects. The underlying engineering overlaps enough to matter.
Ad integration in e-commerce is mostly plumbing. Event passing, placement management, analytics data, communication between separate services. A sponsored product impression fires correctly. A click routes to the right landing page. A purchase is attributed back to the ad. These are integration problems before they are ad problems.
Adding ad features to a commerce platform raises engineering questions:
- Custom AdTech platform engineering;
- Advertising system integrations;
- Data processing and analytics;
- Campaign management software.
The ad architecture has to fit the retailer’s existing technical systems. A separate ad stack bolted on rarely works without friction. Oxagile’s experience with complex ad integrations matters when a retail company adds ad functions to a product that already has its own architecture, its own services, its own data model.
4. Innowise
Innowise is a general software engineering firm with AdTech and e-commerce practices. For retail media, the relevant work is not a standalone ad engine. It is how ad tools interact with the commerce system. Product catalog connections, purchase event processing, analytics integrations. Innowise handles those kinds of projects.
Sometimes the ad system is one feature inside a larger e-commerce product. Developers have to respect the existing architecture, internal services, and order data. A retail media module cannot live in isolation. It reads from the catalog, writes to the analytics pipeline, and respects user permissions. Integration work is more than ad technology.
The development directions that matter for embedded ad functions include:
- Custom advertising software;
- E-commerce platform integration;
- Data engineering and analytics;
- Cloud-based application development.
Building ads as part of a commerce platform differs from creating a specialized programmatic system. Innowise fits projects where ad features are one component of a broader product. The company’s mix of AdTech and e-commerce engineering is the relevant asset. It is not a retail media specialist, and that is fine. Most retail media builds need generalists who can connect systems, not a narrow vendor.
Where Retail Media Projects Need Different Partners
Retail media work splits into three rough categories. Each one pulls in a different type of partner. Custom platform from the ground up? The retailer needs engineers who own architecture and stick around. Not a body shop that ships a build and vanishes. Ready-made ad infrastructure fits when speed beats control, assuming the retailer can tolerate someone else’s design decisions.
The third category gets messy. Ad features embedded into a live e-commerce product. Engineers here juggle two systems at once. How the store works. How the ad system works. Where they clash. Internal engineering capacity, data access, how tightly ads bind to checkout.
Those questions shape the rest. A grocery chain with loyalty data runs into different walls than a marketplace with third-party sellers. A retailer with a mature engineering department versus one outsourcing everything. The project type picks the partner, not the other way around.
Final Thoughts
After launch, retail media becomes an economics problem. A system can serve sponsored products correctly and still fail. Advertisers judge by sales results. By attribution quality. By whether they can pull a report without emailing support. A platform that cannot prove ROI loses budgets, no matter how clean the architecture. What does the infrastructure tell brands? What does it tell internal teams? Reporting latency, attribution windows, data granularity. These decide whether the system survives past year one. Shipping is not finishing. Renewal is.
