GDPR Compliance
GDPR compliance means managing how your organization collects, processes, and stores the personal data of EU individuals in line with the General Data Protection Regulation: consent mechanisms, data flows, retention, and subject rights requests. Trellist audits and manages GDPR compliance across your marketing technology and customer data operations for organizations that handle EU customer or prospect data.
What we do
GDPR Compliance Audits
Assessing consent mechanisms, data flows, and retention practices across your marketing and customer data systems.
Tools we work with
OneTrust for cookie scanning and consent records
Google Tag Manager for an inventory of every tag and what fires before consent
Consent Management Implementation
Building and configuring the consent capture and preference infrastructure GDPR requires.
Tools we work with
OneTrust for consent banners and preference centers
Cookiebot for consent banners across smaller site portfolios
Google Tag Manager for Google Consent Mode and consent-aware tag firing
Data Flow Mapping
Documenting where personal data actually moves across your MarTech stack, often the first gap an audit uncovers.
Tools we work with
Salesforce for CRM and Marketing Cloud data
HubSpot for CRM, form, and email data
Adobe Experience Platform for profile and event data across Adobe tools
Subject Rights Request Support
Building the operational process to handle access, deletion, and portability requests within required timeframes.
Tools we work with
OneTrust for request intake, identity checks, and tracking
Power Automate for routing each request to every system that holds the data
Ongoing Governance & Monitoring
Continuous compliance management as your data systems and marketing stack evolve.
GDPR Compliance Audits
Assessing consent mechanisms, data flows, and retention practices across your marketing and customer data systems.
Tools we work with
OneTrust for cookie scanning and consent records
Google Tag Manager for an inventory of every tag and what fires before consent
Consent Management Implementation
Building and configuring the consent capture and preference infrastructure GDPR requires.
Tools we work with
OneTrust for consent banners and preference centers
Cookiebot for consent banners across smaller site portfolios
Google Tag Manager for Google Consent Mode and consent-aware tag firing
Data Flow Mapping
Documenting where personal data actually moves across your MarTech stack, often the first gap an audit uncovers.
Tools we work with
Salesforce for CRM and Marketing Cloud data
HubSpot for CRM, form, and email data
Adobe Experience Platform for profile and event data across Adobe tools
Subject Rights Request Support
Building the operational process to handle access, deletion, and portability requests within required timeframes.
Tools we work with
OneTrust for request intake, identity checks, and tracking
Power Automate for routing each request to every system that holds the data
Ongoing Governance & Monitoring
Continuous compliance management as your data systems and marketing stack evolve.
Our approach
We start by mapping how personal data actually flows through your marketing and customer data systems. From there we assess consent mechanisms and retention practices against GDPR requirements, implement the fixes and infrastructure needed, and move into ongoing governance so compliance holds as your stack changes.
Signs you need this
- You’re not confident you could map every place EU customer or prospect data flows through your MarTech stack.
- Consent capture varies inconsistently across different forms and properties.
- Subject rights requests are handled manually, without a documented, repeatable process.
- Your last compliance review predates a significant MarTech stack change.
What you’ll gain
- A documented map of where personal data actually flows, not an assumption.
- Consistent, compliant consent capture across every property.
- A repeatable process for handling subject rights requests within required timeframes.
- Compliance that holds up as your stack evolves, not a snapshot that goes stale.
How it compares
Trellist audits and manages GDPR compliance specifically within your marketing technology and customer data operations, where much of the real exposure actually lives. That’s different from a generic legal compliance review, which may not have visibility into how your MarTech stack actually handles data day to day, and different from a one-time audit, which doesn’t account for how quickly stacks and data flows change.
Why it matters
Cumulative GDPR fines have surpassed €7.1 billion since 2018, with €1.2 billion issued in 2025 alone, the fastest single-year pace since enforcement began. Enforcement has also broadened: between January 2023 and March 2026, regulators issued more fines against smaller businesses than in the preceding five years combined, meaning GDPR risk is no longer just a large-enterprise concern.
FAQ
Do we need to worry about GDPR if we’re a US-based company?
If you collect or process data from individuals in the EU (including website visitors and prospects, not just customers), GDPR can apply regardless of where your company is based.
How is this different from a legal GDPR review?
We focus specifically on how your marketing technology and customer data systems actually handle data in practice, which is where most real-world compliance gaps live.
Is this a one-time engagement?
It can be, but ongoing governance is what actually keeps you compliant as your MarTech stack and data flows change; a point-in-time audit only reflects the day it was run.
Why Trellist
We bring MarTech and customer data systems expertise to GDPR compliance, not just a legal compliance checklist; the gaps usually live in how the stack actually works.
Signs you need this
- You’re not confident you could map every place EU customer or prospect data flows through your MarTech stack.
- Consent capture varies inconsistently across different forms and properties.
- Subject rights requests are handled manually, without a documented, repeatable process.
- Your last compliance review predates a significant MarTech stack change.
What you’ll gain
- A documented map of where personal data actually flows, not an assumption.
- Consistent, compliant consent capture across every property.
- A repeatable process for handling subject rights requests within required timeframes.
- Compliance that holds up as your stack evolves, not a snapshot that goes stale.
How it compares
Trellist audits and manages GDPR compliance specifically within your marketing technology and customer data operations, where much of the real exposure actually lives. That’s different from a generic legal compliance review, which may not have visibility into how your MarTech stack actually handles data day to day, and different from a one-time audit, which doesn’t account for how quickly stacks and data flows change.
Why it matters
Cumulative GDPR fines have surpassed €7.1 billion since 2018, with €1.2 billion issued in 2025 alone, the fastest single-year pace since enforcement began. Enforcement has also broadened: between January 2023 and March 2026, regulators issued more fines against smaller businesses than in the preceding five years combined, meaning GDPR risk is no longer just a large-enterprise concern.
FAQ
Do we need to worry about GDPR if we’re a US-based company?
If you collect or process data from individuals in the EU (including website visitors and prospects, not just customers), GDPR can apply regardless of where your company is based.
How is this different from a legal GDPR review?
We focus specifically on how your marketing technology and customer data systems actually handle data in practice, which is where most real-world compliance gaps live.
Is this a one-time engagement?
It can be, but ongoing governance is what actually keeps you compliant as your MarTech stack and data flows change; a point-in-time audit only reflects the day it was run.
Why Trellist
We bring MarTech and customer data systems expertise to GDPR compliance, not just a legal compliance checklist; the gaps usually live in how the stack actually works.
Confident you could map every place EU customer data flows through your stack right now?
Let’s talk
We’re ready to listen
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