E-commerce × Retainer Work
Best E-commerce AI Agencies for Retainer Work (September 2026)
E-commerce AI agencies with verified retainer client evidence — ranked by depth of documented work, then editorial quality.
Each listed agency documents retainer engagements on its own site or in a published case study; the model is never inferred from a service list.
Ranked agencies for retainer clients
Rankings updated · Newest review
Dublin, Ireland
Client evidence: 20 documented clients overall
Best for: Irish and European SMEs and founders buying a whole product build, with AI as one layer inside it rather than the whole engagement.
ontolux
#2Berlin, Germany
Client evidence: 13 documented clients overall
Best for: German public bodies, broadcasters and publishers that need tagging and search over large German-language text collections.
OstraconAI
Verified: the agency confirmed ownership from a company email address, and the listing passed editorial review#3Helsinki, Finland
Client evidence: 11 documented clients overall
Best for: Nordic marketing and sales teams that want AI tools built into HubSpot, Teams or Microsoft 365 and their own staff trained to run them.
Madrid, Spain
Client evidence: 11 documented clients overall
Best for: Consumer-facing brands and large operators in Spain evolving a digital product over years, with AI added into an existing workflow.
Redkiwi
#5Rotterdam, Netherlands
Client evidence: 9 documented clients overall
Best for: Dutch consumer brands and B2B suppliers buying a website, webshop or campaign where generative AI speeds up content production.
Found
#6London, United Kingdom
Client evidence: 8 documented clients overall
Best for: UK consumer brands in retail, insurance and hospitality that want AI applied inside paid search, SEO and campaign data.
Rotterdam, Netherlands
Client evidence: 8 documented clients overall
Best for: Mid-sized Dutch companies that want ERP, CRM and finance data in one managed Power BI environment before any AI build.
Budapest, Hungary
Client evidence: 7 documented clients overall
Best for: Banks, retailers and utilities that want a propensity or next-best-offer model on their own data, scored on a business rate.
Warsaw, Poland
Client evidence: 7 documented clients overall
Best for: Data-rich firms and startups with a detection, vision or forecasting problem suited to a research-led team.
Syncronika
#10Milan, Italy
Client evidence: 6 documented clients overall
Best for: Italian brands that want one long-term partner for site, commerce, integrations and marketing, with AI added to that stack.
ClickSlice
#11London, United Kingdom
Client evidence: 6 documented clients overall
Best for: UK online retailers that want an existing SEO campaign extended to how ChatGPT, Gemini and Perplexity recommend brands.
Warsaw, Poland
Client evidence: 5 documented clients overall
Best for: Small manufacturers, contractors and agencies automating invoice, document and CRM workflows on a Make.com or Zapier stack.
NOVOS
#13London, United Kingdom
Client evidence: 5 documented clients overall
Best for: Consumer e-commerce brands that want to be named in AI answers through SEO and digital PR, with share-of-answer tracking.
Imobisoft
#14London, United Kingdom
Client evidence: 4 documented clients overall
Best for: Health and industrial companies taking a risk-scoring or compliance-reporting workflow from paper to a regulated digital platform.
Contiamo
#15Berlin, Germany
Client evidence: 4 documented clients overall
Best for: German municipal utilities, housing companies and consumer brands adding GPT-based assistants to customer service and content work.
Ekimetrics
#16London, United Kingdom
Client evidence: 4 documented clients overall
Best for: Consumer and industrial brands that need marketing spend measured and modeled rather than an AI system built.
Sngular
#17Madrid, Spain
Client evidence: 3 documented clients overall
Best for: Enterprises staffing a multi-year engineering program in infrastructure, banking or back-office automation with a single partner.
Boldare
#18Amsterdam, Netherlands
Client evidence: 3 documented clients overall
Best for: Consumer-facing businesses adding an OpenAI-backed chatbot or generated content to a web platform Boldare builds or runs.
Zurich, Switzerland
Client evidence: 3 documented clients overall
Best for: Banks and payment providers adding AI to platforms an established engineering partner already operates for them.
Inbold
#20Oslo, Norway
Client evidence: 3 documented clients overall
Best for: Consumer and healthcare brands needing campaign and compliance production at Nordic scale, with AI used in the making.
wukonig.com
#21Graz, Austria
Client evidence: 3 documented clients overall
Best for: B2B and industrial firms that want to be named in AI answers and will fund a measured, ongoing program.
VisualLabs
#22Budapest, Hungary
Client evidence: 3 documented clients overall
Best for: Field-service and distribution businesses on Microsoft Dynamics that want their data and processes fixed before adding Copilot or agents.
Madrid, Spain
Client evidence: 3 documented clients overall
Best for: Early-stage founders in Spain who need a product built quickly and will scope any real model work separately.
Dmlab
#24Budapest, Hungary
Client evidence: 2 documented clients overall
Best for: Hungarian operators in energy, logistics or media that need a forecasting system wired into how the business already trades.
Amsterdam, Netherlands
Client evidence: 2 documented clients overall
Best for: Regulated institutions and retailers with a pricing, risk or monitoring problem that can be measured.
Head-to-head
About this list
Most of the e-commerce work documented on this page is storefront, integration and demand generation, with AI at the edges. Syncronika keeps Caffitaly's Shopify store in sync with SAP through its own Python middleware, non-AI work in decade-long relationships. Redkiwi's Bruynzeel Keukens Magento webshop and Eshuis label-ordering platform carry no AI component, while Esbjaerg Vodka's repositioning used a generated image library in place of a shoot. NOVOS is the demand-side specialist: Osprey's share of AI answers reached 72.6%, and MORI's December revenue rose 73% after the KIDLY migration onto Shopify. OstraconAI's Olo-apteekki banner generator turned 20 to 30 minutes of production per set into near-instant output from real product images. Data Analytics built Diamond Point's reporting over POS, e-commerce and inventory data. G+D Netcetera's STET engagement is Click to Pay for French e-commerce transactions, a payments rail. Ekimetrics models marketing mix, Eurostar the named case; Inbold's ARKK campaign is generated backgrounds around a studio shoot. The model-led cases are fewer: Found's deep neural network predicting each product's 30-day sales value for Secret Sales is credited with 28% higher ROAS than the account's other Shopping campaigns, and HolistiCRM's classifiers and recommender for Delivery Hero's Hungarian brand with open rates up 250 percent.
Ask which layer of the shop the retainer touches, and how much of the monthly scope is a model rather than a Magento or Shopify sprint. Storefront retainers are judged on uptime and release cadence; demand retainers on numbers you can verify, and the curator notes that Heal's and MORI print the same headline figure on NOVOS's site. If a proposal describes an agent in the shop, ask for the client where it runs today; the cases documented for Syncronika and Redkiwi stop short of that.
Intro by Gabor Kiss, curator · How we rank
Expert Insight
Why E-commerce experience matters
Measurement discipline—E-commerce AI can and should be A/B tested against revenue. Specialists propose baselines, holdouts, and target metrics before writing code; be suspicious of anyone who wants credit for a lift they didn't isolate from seasonality and campaigns
Platform constraint fluency—A recommendation engine that can't be served within Shopify, commercetools, or your legacy stack's latency and API limits is a research project. Specialists design for the platform you run, not the one their demo runs on
Catalog-data pragmatism—Attribute gaps, inconsistent taxonomies, and thin product descriptions are the default, and they cap what personalization and search can do. Specialists budget the data-cleanup phase honestly and often automate it with generative models as part of the build
Seasonality and drift—Recommendation and forecasting models decay as catalogs, seasons, and campaigns change. Specialists set up monitoring and a retraining cadence at launch, because a model tuned on winter traffic quietly loses money by summer
Frequently asked questions
25 agencies in our directory combine verified retainer client evidence with documented E-commerce work. The current top-ranked are Square Root Solutions, ontolux, OstraconAI — ordered by depth of documented client evidence, then our editorial scoring (portfolio quality, credibility, completeness); placement is never paid.
Published rates across this page's agencies run €20–400 per hour (median ~€65). Project totals depend on scope — the rate index at /rates breaks the computed bands down by region, country and team size.
Every agency here documents retainer work on its own site or in a published case study, describing the engagement structure rather than a service-list claim. We never infer the model from portfolio tone, so this list only contains agencies that operate retainer engagements deliberately.
3 of the agencies on this page document an embedded / team-extension working model. See the team-extension page for the full verified list, or check the engagement chips on individual profiles.