Growth marketing Growth marketing agency
Looking for a growth marketing agency that doesn't bet on one big idea but builds growth systematically? We set up a data-driven growth engine across your whole funnel and scale what works.
Tanguy De Keyzer Founder & digital strategist Last updated: 1 July 2026
Trusted by growing brands
Sound familiar?
We've had agencies before, but nobody made our growth genuinely predictable.
We do a bit of everything, and yet nothing really scales.
I don't know which agency will take us beyond one-off campaigns.
We want to grow, but not gamble with our budget.
How we help
As a growth marketing agency, we start from your numbers, not gut feeling. We map your funnel, run continuous experiments and only scale what demonstrably works, so growth becomes a system instead of a coincidence.
About Customer Impact
The missing piece of your growth puzzle.
Customer Impact is a digital marketing agency founded by Tanguy De Keyzer. For more than 10 years we have been building the growth engine of startups, scale-ups and established companies.
No isolated campaigns, but an approach that fits your bigger growth picture, with strategy and execution under one roof. A small, senior team that steers on leads and revenue instead of vanity metrics.
What we stand for:
- Efficiency over volume: the right levers, not more noise
- Every euro measurable, from lead to revenue
- Marketing and sales aligned around the same goals
- Strategy and execution, under one roof
What we do
Growth marketing agency.
Growth audit & strategy
We map your entire funnel and pinpoint where the biggest, fastest growth opportunities sit.
Experiment roadmap
A continuous stream of experiments, each with a hypothesis, a measurable outcome and a lesson.
Full-funnel growth
Acquisition, activation, retention and referral. The fastest win often isn't more traffic, but better activation.
North Star & reporting
One clear growth metric the whole team steers on, with transparent numbers underneath it.
Ownership & transparency
Your accounts, data and learnings stay yours. No black box, but shared visibility and decisions.
Scalable channels
We find the channels that pay off for you and put them on an accelerated path to scale.
More and more ambitious companies aren’t looking for a standalone agency for a single campaign, but a partner that makes growth predictable. That is exactly what a growth marketing agency does: it builds a data-driven growth engine across your whole funnel, instead of betting on one big idea. See also our broader growth marketing service.
What a growth marketing agency does differently
A traditional agency often stops at brand awareness and one-off campaigns. A growth marketing agency looks at every step of the funnel: how you attract people, activate them, retain them and bring them back. It works from hypotheses and experiments, measures everything, and only scales what demonstrably pays off.
Do it yourself or outsource?
You can build growth in-house, but that takes a team, tools and a proven process. A specialist agency brings that immediately, plus the discipline to keep measuring and adjusting. We make that trade-off honestly with you.
Who does it work for?
Growth marketing works best for startups, scale-ups and ambitious companies that want to grow fast and predictably, and are willing to experiment instead of betting on one big campaign.
Ready to make growth predictable?
The first step is a growth audit: where are your biggest, fastest growth opportunities? We map them and build an experiment roadmap that delivers results week after week. Book a free intake and hear where your opportunities are within 24 hours.
The difference between a good and an average growth marketing agency isn't the number of campaigns, but the discipline to measure, learn and only scale what genuinely works.
Tanguy De Keyzer Founder of Customer Impact and digital strategist What clients say about us
No empty promises. This is what clients say about working with Customer Impact.
“Strong lead generation and analysis of growth opportunities using AI technology that makes a real impact.”
RRené De Keyzer
Verified review via Google
“I have been working with Tanguy for three years now and it is always a pleasure. Plenty more good things to come!”
PPieter-Jan Maleux
Verified review via Google
“Tanguy combines knowledge, fresh ideas and hands-on experience in a rare way that makes a tangible difference for growing companies.”
FFern Thanaporn Uparirat
Verified review via Google
“Fantastic company to work with. They helped us build our website and with lead generation, and we are very happy with it. The smooth communication made the whole process pleasant.”
LLahcene Merzoug
Verified review via Google
“Customer Impact built a strong new website for us and set up a lead generation approach that truly delivers results.”
JJanitor Waterschoot
Verified review via Google
“Tanguy built a completely new website for us, with a structure and message truly focused on convincing visitors. Highly recommended.”
SSam Van den Bosch
Verified review via Google
Frequently asked questions
What exactly does a growth marketing agency do? ＋
A growth marketing agency builds a data-driven growth engine instead of one-off campaigns. It optimizes every step of your funnel, from acquisition to retention, through continuous experiments, and steers on a clear growth metric instead of vanity numbers.
What does a growth marketing agency cost? ＋
That depends on your ambition, market and starting position. We work with a clear scope after an initial audit, with no surprises afterwards. We walk through how pricing is built during the free intake.
Why outsource growth marketing to an agency? ＋
A specialist agency brings a proven experimentation process, experience across multiple channels and the discipline to measure and adjust. You build a growth engine faster than figuring it all out yourself, and without hiring a full team.
How do I choose the right growth marketing agency? ＋
Look for an agency that starts from your numbers and goals, reports transparently, respects ownership of your own accounts and data, and talks in pipeline and revenue rather than clicks. An agency that promises hard guarantees on a fixed number of clients is usually the real red flag.
How quickly will I see results? ＋
The first experiments run within weeks. Because we iterate fast, small wins compound into real, lasting growth rather than a one-off spike.
Ready to win your market?
Book a meeting with our digital strategist Tanguy.