Your own advertising platform — ad server, DSP/SSP, DMP, or a retail media stack — built on your first-party data. We don't replace Google Ad Manager or The Trade Desk at enterprise volumes, but we do build specialty adtech that follows your audience, formats and compliance requirements.
A publisher, a retail media network and a B2B platform have fundamentally different needs. The publisher wants to become less dependent on Google AdSense and win back its own margin; the retailer wants to sell sponsored placements on its own storefront and turn that revenue directly into extra income on existing traffic; the B2B platform wants its own ad formats for a niche audience for which the big DSPs have no inventory. No off-the-shelf stack handles all three cases equally well — Google Ad Manager is strong in serving, The Trade Desk in demand-side bidding, a CDP vendor in audience management, but the combination and the custom work around it are always missing.
We build adtech software for organisations that want to own their ad stack — including the bidding engine, the audience layer and attribution. We have been working on custom enterprise software projects since 2015 and have delivered adtech components for publishers, brand merchants and networks that sell media themselves. No template installation. A platform that fits your inventory, your data and your compliance stack — and whose roadmap you determine yourself instead of depending on the release calendar of a large suite.
The post-cookie world makes this choice more urgent. Chrome has blocked third-party cookies, the Privacy Sandbox (Topics API, Protected Audience) is being rolled out in full, and Apple's ATT framework pushes iOS inventory towards opt-in. Anyone still building their advertising strategy on third-party cookies is building on sand. The question becomes: how do I activate my first-party data, server-side, with an audit trail, within European consent rules? And how do I do that without vendor lock-in to a platform that doubles its price tomorrow or closes its API?
Our approach always starts with the business: which ads are sold, to whom, and at what margin. Only then do we draw up the architecture. Sometimes the answer is that your own platform is overkill and a smart configuration of existing tooling — Prebid.js, a CMP, server-side GTM — is enough. Sometimes the answer is a completely new platform because the revenue model can't be squeezed into an existing suite. We'll tell you honestly which way it should go.
Publishers: media companies, trade publishers and news portals that want to run their own ad stack alongside or instead of Google AdSense. An in-house ad server gives your direct sales team a proper interface and enables header bidding without relying entirely on a single partner. For a publishing group operating several titles together, an SSP layer is a logical next step.
Brand merchants and e-commerce: businesses that want to activate their customer data for their own campaigns. For many brands, a CDP-style first-party data platform with a segment builder and server-side activation to Meta CAPI, LinkedIn CAPI or Google Ads now works more efficiently than an external DMP, as it sits within your own tech stack and remains transparent.
Retail media networks: e-commerce businesses with enough traffic to sell sponsored placements to brands that sell through them. Bol.com, Albert Heijn and MediaMarkt have turned this into a growth segment; regional players and B2B marketplaces can follow suit with a proprietary retail media platform. We build the self-service buying interface, the targeting layer and the attribution reporting.
Specialty DSPs and SSPs: companies that want to run their own demand-side or supply-side platform for a specific vertical, such as financial services, B2B, lifestyle or a regional market. These are not intended to compete with The Trade Desk, but to support a commercial team activating its own pool of advertisers or inventory.
Connected TV, digital OOH and FAST channels: formats where standard adtech is less mature. Custom development is often the norm here: VAST/VPAID streaming, programmatic DOOH with store-front targeting, and FAST channel ad insertion. We have built programmatic components that serve exactly these ad formats.
Advertising agencies: agencies that want to offer their clients their own campaign management environment. White-label adtech that carries your agency's brand, with per-client reporting and consolidated insights for account managers.
B2B ad platforms: a LinkedIn-style platform for a specific professional group, or native advertising within a trade platform. Large DSPs typically lack the right targeting here (intent data, account-based attribution), so proprietary software delivers greater effectiveness directly.
Most projects fall into one of these three. Which one fits depends on who sells the inventory, which audience you are activating and how much you want to control under the bonnet yourself. In the first conversation, we advise which profile matches.
The foundation layer for publishers, retail media networks and brand merchants that sell their own inventory. Ad serving, frequency capping, pacing, budget management, and a dashboard in which your sales team schedules campaigns. A replacement for GAM at mid-market level, not enterprise, but with your own reporting logic and your own brand layer. We build around the way your sales team actually works: deals, IOs, make-goods, last-minute swaps, without the workarounds you currently have to force through Google Ad Manager.
A proprietary first-party data layer on top of your existing data sources, often fed by a custom data engineering platform. Segment builder, cohort modelling, lookalike extension, exclusion lists and GDPR consent management. Server-side activation to your ad server or to external DSPs via OpenRTB. For the post-cookie world: you activate on data you own, with TCF 2.2-compliant consent. Segments are searchable for your ad ops and commercial teams, with version history so audiences are reproducible, which is useful when an advertiser asks how a target audience was precisely constructed.
A complete bidding engine for mid-market players with a specific focus: a retail media network selling sponsored placements, a vertical DSP for a niche audience, or an SSP for a group of independent publishers. OpenRTB protocol, header bidding, real-time decisioning, attribution and anti-fraud. Available white-label for your clients or agency partners. Scaled to the QPS your inventory actually demands: no overkill for a mid-market platform, no shortfall for a growing retail media stack.
A working adtech platform your team manages itself, plus everything you need to keep building without vendor lock-in.
With OneDayBuild, we turn your idea into something tangible in one day for €1,150, so you can see whether further development is worth the investment. Decide to go ahead with the full build? Then we credit the full cost.
Explore OneDayBuild →Four situations in which we help organisations build their own adtech stack. If one of these sounds familiar, we'd be glad to talk.
Your inventory runs through a handful of large parties. Margin is being eroded, the auction is a black box, and you are at the mercy of policy changes you cannot influence. An in-house ad server, integrated with your headless CMS and publishing workflow, gives you back your margin and your control.
Your e-commerce site or marketplace has enough traffic to sell your own retail media inventory to brands. A retail media platform with self-service checkout, targeting based on customer segments and transparent attribution makes that business model scalable.
You hold a lot of customer data (purchase history, behavioural data, CRM), but it is fragmented across systems. A CDP layer with cohort modelling and consent-compliant activation turns that data into targetable audiences without relying on third-party cookies.
Connected TV, digital out-of-home, FAST channels, or a LinkedIn-style B2B network for a specific sector: existing tooling provides the basics but not the specific flow. For a niche like this, a custom platform or a white-label addition is often cheaper and faster than stretching a large suite.
A conversation in which we establish which inventory, audiences and advertisers the platform needs to serve. We check the compliance requirements upfront: TCF 2.2, DSA and sector-specific rules (the Wft for financial advertising, for example).
A workshop with your team, plus interviews with your ad ops and commercial people. We produce an architecture blueprint covering the bidding flow, data layers and integrations with your existing analytics and CRM stack. At the end, you have a concrete scope and the first screen flow for the campaign dashboard.
A working build every two weeks. We start with the ad server core, then the campaign management UI, then the reporting layer, and then the more complex layers (DMP, RTB, attribution). Your team tests alongside us each sprint and helps decide where the priorities lie.
Before going live: penetration testing, a review of the TCF 2.2 consent flow, an audit trail check and data flow mapping for a DPIA. Anti-fraud detection is tuned to realistic traffic patterns from your inventory.
A phased rollout: first a pilot campaign on part of your inventory, then scaling up. Ongoing development is based on what ad ops and advertisers encounter in practice. A maintenance contract for monitoring and security patches continues alongside.
What clients usually want to know before starting work on an adtech platform.
A no-obligation introductory call of half an hour. We listen to your inventory, audience and compliance requirements, ask questions, and give direction — even if the honest conclusion is that an existing platform suits you better than custom.
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