Analytics Consultant — audit, setup and data ownership

What does an analytics consultant do?

An analytics consultant is an independent expert in charge of the collection, quality and usage of behavioral data on a website or application. The scope covers: auditing existing tracking, choosing and configuring measurement tools (Google Analytics 4, Piano, Matomo), bringing GDPR compliance, building operational dashboards, and connecting web data to business systems (CRM, ad platforms).

Compared to an agency, a freelance consultant is your single point of contact for the project. No account manager, no junior learning on your setup. You work directly with the person writing the GTM configuration, the server-side code and the BigQuery queries.

Six facets of the trade

Analytics consulting isn't "installing Google Analytics". It covers six main areas, which interconnect on most engagements.

1. Tracking audits

Before touching any setup, you need to understand what's actually happening. An audit inventories measurement tools in place, gaps between what's tracked and what should be, data losses due to consent or browsers, and inconsistencies between data sources (back-office, GA4, Google Ads). The deliverable is a prioritized action plan, sized in person-days, with an estimate of recoverable data. See the dedicated page on consultant audit tracking.

2. Google Analytics 4 and tag management

GA4 remains the dominant tool — it runs on roughly 85% of my client sites. But it's also the most misconfigured: poorly named events, imprecise conversions, views that don't match any real use case, undeclared custom parameters. A clean setup rests on a documented tagging plan, stable naming conventions, and rigorous GTM implementation. Details on the GA4 consultant page.

3. Server-side tracking

Since Safari ITP, Consent Mode v2 and the gradual phase-out of third-party cookies, a meaningful share of conversions can no longer be measured browser-side. Server-side tracking — via Google Tag Manager Server-Side, Google Tag Gateway or Stape — moves collection onto a server you control. Typical recovery: 20-40% of conversions otherwise lost. Server-side tracking is the EU consultant niche where I focus most actively. See server-side tracking consultant.

4. Consent Mode v2 and GDPR compliance

Google Consent Mode v2 has been mandatory since March 2024 to maintain access to remarketing and modeled conversions. Beyond the technical setup, the whole consent ecosystem needs review: choice of a compliant CMP (Axeptio, Didomi, Cookiebot, OneTrust), arbitration between Basic and Advanced modes, legal documentation (LIA, processing register), reciprocity tests. The compliance requirements are particularly strict in the EU — a topic where I run many missions. See Consent Mode v2 consultant.

5. E-commerce analytics

On retail sites, the stakes are precise: ROAS, average order value, funnel completion rates, paid channel attribution, offline conversion uploads. E-commerce setup requires a rich dataLayer (items, value, currency, coupon, transaction_id), clean Shopify / WooCommerce / PrestaShop integrations, and a bridge to Google Ads and Meta via Enhanced Conversions and Conversions API. See ecommerce analytics consultant.

6. Lead generation and offline conversions

For B2B sites and services with long sales cycles, real ROI isn't measured at the click but at the closed deal. The work consists of connecting the GCLID captured on the site to the CRM, pushing "qualified", "won", "lost" statuses back to Google Ads via offline conversions, and building behavioral scoring. This lets the ad algorithm optimize for real customers, not clicks. See B2B analytics consultant.

Tools I master

I'm tool-agnostic on purpose. The right answer depends on context: traffic volume, GDPR sensitivity of the sector, budget, internal team. Tools I work with regularly:

• Measurement: Google Analytics 4, Piano Analytics (ex-AT Internet), Matomo, Plausible
• Tag management: Google Tag Manager (web and server-side), Commanders Act, Matomo Tag Manager
• Server-side hosting: Stape, Addingwell, Cloud Run, Google Tag Gateway
• CMP and consent: Axeptio, Didomi, Cookiebot, OneTrust (and migration off tarteaucitron)
• Data and reporting: BigQuery, Looker Studio, Power BI, Metabase
• Automation: Zapier, Make, n8n, Python scripts for heavier processing

Sectors I work with

My engagements cluster around three main client types:

• E-commerce: Shopify, WooCommerce, PrestaShop — ROAS, attribution, offline conversions, BI dashboards.
• B2B lead generation: services, real estate, training, insurance — scoring, CRM integration (HubSpot, Salesforce, Pipedrive), offline conversions to Google Ads and Meta.
• Media and large accounts: Piano Analytics, paywalls, audience segmentation. Two years at Club Med and missions for Moulin Rouge, Bourse de Commerce — Pinault Collection, Air France Holidays, Emirates Holidays, YellowKorner, Erasmus+, HarperCollins gave me solid exposure to large-account stakes.

How an engagement runs

1. Scoping (30 min, free): we discuss your context, tools in place and objectives. I assess whether I'm the right fit — if not, I'll point you elsewhere.
2. Quote and timeline: fixed-fee per engagement or day rate depending on the mission type, with a realistic timeline.
3. Audit or exploration: for engagements over five days, I start with a short audit to validate technical assumptions.
4. Implementation: I work in your environments (GTM, GA4, BigQuery, CMP). Everything is documented as we go.
5. Testing: client-side acceptance tests + my own tests in private browsing, mobile, consent-refused. No delivery without validation.
6. Handover: final documentation, team training on the delivered setup, monitoring plan.

My goal is to make your team autonomous on the analytics stack, not to create dependence. If you need ongoing operations afterwards, we agree on a maintenance retainer; if you don't, you part with a documented setup and a trained team.

Why a freelance consultant rather than an agency

A freelance is more suitable when you want a single point of contact, fast execution and a controlled budget. An agency makes sense if you need multiple profiles simultaneously (data engineer, dataviz, frontend dev) or a continuous long-term presence. For most SMBs and mid-market companies, a freelance is enough — it's the best quality/price ratio.

Frequently asked questions

How long does a tracking audit take?

Three to five days depending on site complexity. A standard brochure site with GA4 and GTM: three days. A multi-country e-commerce with server-side and existing CMP: five days. The deliverable always includes a prioritized action plan, sized in person-days.

Do you work remotely or onsite?

About 95% of my engagements are remote — that's the industry standard. I'm based in France and occasionally travel for scoping workshops or kickoff meetings. For day-to-day work (implementation, testing, dashboards), everything happens via video and shared access.

Which tools do you master beyond Google Analytics?

Piano Analytics (ex-AT Internet), Matomo, GTM web and server-side, BigQuery, Looker Studio, Power BI, the main CMPs (Axeptio, Didomi, Cookiebot, OneTrust), automation tools (Zapier, Make, n8n) and marketing APIs (Google Ads, Meta CAPI, LinkedIn Conversions API).

Are you available immediately?

My calendar is generally booked two to four weeks in advance. For urgent missions (broken tracking before a major campaign, GDPR deadline), I try to free up faster. A 30-minute scoping call tells us if it's feasible.