Container audit & cleanup
Every tag, trigger and variable reviewed: dead and duplicated ones removed, the rest named and documented, with workspaces, version notes and user permissions in order.
Analytics · Google Tag Manager
Google Tag Manager, set up so the numbers hold up.
Goodish is a Google Tag Manager agency for teams whose tracking has grown messy or stopped matching the ads. We audit and rebuild GTM containers, deploy GA4 and ad-platform tags through a clean data layer, and move tracking server-side with Meta's Conversions API, Google's enhanced conversions and consent mode, so conversions survive cookie blockers.
- 90+
- Tracked data points across GTM and GA4 for TMT Finance
- Server-side
- ATC Alert's tracking, moved to feed Google Ads and Meta clean conversion data
- Free
- Audit first; a fixed quote on scope after it
Why does a Google Tag Manager setup break over time?
Because containers grow by addition. Every campaign, agency and website release adds tags, nobody removes the old ones, and triggers tied to a button’s CSS class break silently when the site is redesigned. The result is duplicated conversions, missing events and ad platforms learning from the wrong signal.
The fix is structure rather than more tags: a data layer the developers own, one naming plan for events, workspaces and version notes, and a written record of what every tag is for. When the GA4 property itself needs restructuring, that is part of our GA4 consulting; both sit inside our wider analytics service.
What does server-side tagging change?
Where your data goes first. With server-side tagging, the browser sends events to a tagging server you control, and that server passes them on to each platform. In practice it gives you:
- A first-party endpoint. The tagging server runs on your own subdomain, so measurement no longer depends on a dozen third-party scripts in the visitor’s browser.
- Meta Conversions API. Events go to Meta from the server as well as from the pixel, deduplicated, so campaigns optimise on what really happened.
- Google enhanced conversions. Hashed first-party data, such as the email address from a form, helps Google Ads match conversions to clicks.
- Consent mode. The visitor’s cookie choice travels with every event, and the server respects it.
- Resilience to cookie blockers. Conversions that browser privacy features and ad blockers would hide reach the platforms more reliably.
For ATC Alert, a medical alert company, we introduced server-side tagging so that Google Ads (through Google Analytics) and the Meta pixel received accurate conversion data past common cookie blockers. The ATC Alert case study tells the rest.
What should you look for in a server-side tagging agency?
Someone who checks the numbers after launch, not only the setup. A server container that is configured but never reconciled against the backend just moves the errors to a new place.
We compare platform conversions with the CRM or the shop after every change, and we document the result. For TMT Finance that discipline grew into 90+ tracked data points across GTM and GA4, Looker Studio dashboards per team and written documentation of everything tracked.
What does our Google Tag Manager service include?
Data layer & event plan
A data layer your developers can maintain and one naming plan for events, so GA4, the ad platforms and product analytics read the same actions.
GA4 and ad-platform tags
GA4, Google Ads, Meta, LinkedIn, Microsoft Ads and other tags deployed through GTM, checked in preview mode before anything is published.
Server-side tagging
A server-side GTM container on your own subdomain as a first-party endpoint, feeding GA4, Meta's Conversions API and Google Ads enhanced conversions.
Consent mode
Google consent mode connected to your cookie banner, with every tag tested before and after the visitor's choice.
E-commerce & cross-domain
Purchase and lead events with transaction IDs that prevent double counting, and cross-domain tracking across checkout, booking or app subdomains.
Real clients, real numbers, straight from our client reports.
What moved, and for whom
Medical alert systems · 2023 → 2024
A → G
Ad message variants tested
A/B-tested messaging that moved from the watch to the service, server-side tagging that feeds clean conversion data to Google and Meta, and Mailchimp emails that update themselves from Chargebee subscriptions.
TMT Finance Financial media & funding, United Kingdom · 2023 → today
−97%
cost per lead
- Cost per lead, late 2023 → early 2026$2,140 → $48.74
- Conversions a month2 → 155
Product analytics and UX forensics first, an onboarding flow redesigned on that data, and only then Google Ads relaunched with smart bidding fed by the new conversion data.
Onboarding software for financial advisors · 2020
Research and design guidelines, a fast WordPress site the team publishes to themselves, and tracking that joins the website (Google Tag Manager and Google Analytics) to in-app analytics in Mixpanel.
Working with Goodish was great. They fixed a goal tracking / data integrity issue that had several other experts stumped. I wouldn’t hesitate to work with them again in the future.
How an engagement runs
Audit
We open the container, GA4 and the ad accounts, compare what fires with what the platforms and your backend record, and write down every gap.
Rebuild
Data layer, tags and the server-side container built in a separate workspace, tested in preview, then published with version notes.
Verify & hand over
Conversions checked against the CRM or backend after launch, and a written record of every tag, trigger and event your team can maintain.
How is it priced?
Scoped per setup: a single tag and a full monitoring system are very different jobs, so we quote after the free audit.
FAQ
Questions people ask
What does a Google Tag Manager agency do?
It sets up and maintains the tags that send website behaviour to your analytics and ad platforms: GA4, Google Ads, Meta and the rest. Adding a tag is easy; the work is a data layer, triggers and naming that stay correct as the site changes, and conversions that match what your backend records.
What is server-side tagging?
Instead of every pixel loading in the visitor's browser, the browser sends one stream of events to a tagging server on your own subdomain, and that server forwards them to GA4, Meta's Conversions API and Google Ads. You decide what leaves, the endpoint is first-party, and conversions are less exposed to ad blockers and browser privacy features.
Do we still need the Meta Pixel if we use the Conversions API?
For most accounts, yes. We run both and deduplicate them with a shared event ID, so Meta gets the browser signal and the server signal without counting a conversion twice.
Does server-side tagging get around cookie consent?
No, and it shouldn't. Consent mode and your cookie banner still decide what may be collected; server-side tagging makes what is collected more reliable and gives you control over what each platform receives.
What is the difference between Google Tag Manager and Google Analytics?
Google Tag Manager decides which tags fire and what data they send; it stores nothing itself. GA4 is one of the destinations: it stores the data and reports on it. Most of our clients use both, with GA4 configured through GTM.
How much does a Google Tag Manager setup cost?
The first audit is free. Implementations and monitoring systems, including server-side tagging, are quoted on scope after it.