Projects

Key Results & Highlights

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287% average growth: Across all 2025 client projects, organic traffic grew an average of 287% within 6 months of launch β€” driven by Core Web Vitals optimization and semantic site architecture.
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Sub-1s load times: Every site we ship achieves a PageSpeed score of 95+ on mobile. Our average LCP across all 2025 projects is 0.84 seconds β€” top 5% globally.
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Data before pixels: We run a 3-week discovery sprint before touching design. Every layout decision is validated against heatmaps, session recordings, and conversion funnel data.
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3.4Γ— conversion lift: Our CRO-informed design process lifted average conversion rates by 3.4Γ— versus client baselines β€” across e-commerce, SaaS, and professional services.
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Compounding returns: Sites we built in 2023 have continued to grow β€” averaging +412% cumulative organic traffic growth over 2 years through strategic content architecture and continuous optimization.
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7 industries, 1 framework: Our data-driven optimization system adapts across SaaS, e-commerce, professional services, healthcare, fintech, real estate, and creative industries.

Why Data-Driven Web Design?

Analytics dashboard showing web performance metrics

Most web design studios build beautiful websites. We build websites that perform. The difference is entirely in how decisions get made.

  • Design choices backed by real user behavior data, not gut feel or trend-chasing
  • Architecture built for search engines and conversion funnels simultaneously
  • Continuous post-launch optimization β€” not a "done and delivered" handoff

Every pixel we place has a measurable purpose. Every CTA position is validated. Every page structure is built around the user's intent journey β€” from first impression to conversion event.

Great design without data is decoration. We build instruments of growth.
Get a Free Performance Audit We'll analyze your site's speed, SEO health, and conversion potential within 48 hours
Request Audit β†’

Technology

We developed a 4-phase optimization framework based on data patterns from 50+ projects across 7 industries. Every engagement starts the same way β€” by listening to what your analytics are already telling us.

Our Methodology

01
Discover β€” 3-week deep-dive into analytics, user session recordings, competitor gap analysis, and keyword opportunity mapping. No assumptions.
02
Design β€” Wireframes validated against user behavior data; visual design system built on your brand identity and conversion psychology principles.
03
Build β€” Production-grade development with Core Web Vitals, WCAG 2.1 AA accessibility, and technical SEO baked in from line 1 of code.
04
Optimize β€” 90-day post-launch sprint: A/B tests, heatmap analysis, Search Console monitoring, and iterative data-backed improvements.

Growth by Channel: Where Results Come From

Across our 2025 client portfolio, organic search drove the most compounding value β€” but the combination of technical SEO, paid efficiency gains from faster pages, and conversion rate optimization created the biggest total revenue impact.

Average Client Traffic Growth by Channel (2025 Portfolio)
Organic search leads compounding growth; CRO amplifies every other channel
Organic β–²
Referral
Direct
Social
Paid
Email
0.84s
Avg LCP (mobile)
β†’
98/100
Avg PageSpeed
β†’
3.4Γ—
Conversion lift
What We Build & How We Optimize

Our studio covers the full spectrum of digital performance β€” from first concept to continuous optimization. Every service is interconnected: better design improves SEO signals, better SEO feeds richer data, better data improves design decisions.

  • Web Design β€” UX research, wireframing, visual design, design systems, responsive mobile-first layouts
  • Development β€” Vanilla JS, React, Next.js, Astro, Webflow β€” chosen for performance, not hype
  • Data & Analytics β€” GA4, Looker Studio, Hotjar, PostHog β€” decision-quality data, not vanity metrics
  • SEO & Content Architecture β€” Technical SEO, schema markup, Core Web Vitals, semantic HTML
  • CRO β€” A/B testing, landing page optimization, checkout UX, form design
  • n8n Workflow Automation β€” Lead routing, reporting pipelines, CRM integrations, alert systems
⚠️ The Shift We're Seeing

Clients are moving away from "just a website" toward full-stack digital systems β€” combining design, automation, analytics, and continuous optimization in one connected engagement. Demand for n8n workflow automation as part of web projects grew 367% in 2025. The market is catching up to what high-performers already know: automation-integrated sites aren't a luxury, they're the baseline.

Client Results: Before & After

To understand real impact, we tracked KPIs for 12 clients who shared before/after data across website redesigns with our full optimization stack, versus their previous sites with legacy design and no data strategy.

We also tracked clients 12 months post-launch to capture compounding results β€” not just launch-day spikes.

Before
1.8%
Avg conversion rate
β†’
Same business,
new digital system
After
6.1%
Avg conversion rate
β–² +3.4Γ— lift
βœ… What Drives the Lift

The conversion rate improvement isn't one change β€” it's the compounding effect of faster load times (avg -1.4s improvement), cleaner user flows (avg -2 clicks to conversion), better social proof positioning, and targeted A/B testing during the 90-day post-launch sprint. The data consistently shows: performance + design + optimization together outperform any single lever by 4–6Γ—.

Which Industries We Serve Best

Digital Performance by Industry (2025 Portfolio)

Average Organic Traffic Growth After Launch β€” by sector
SaaS & Software
+341%
E-commerce
+287%
Professional Services
+266%
Fintech
+242%
Healthcare
+214%
Real Estate 🏠
+198%
Creative / Agency
+164%
Non-profit
+98%
1

SaaS Sees the Highest ROI from Technical SEO

SaaS companies have long sales cycles and high customer lifetime values β€” making compounding organic traffic extremely valuable. Our technical SEO work for SaaS clients consistently delivers the highest measured ROI of any industry, averaging +341% organic growth within 6 months of launch.

2

E-commerce Wins with Speed + CRO Together

A 1-second improvement in load time correlates to 7% higher conversions. Our sites average sub-1s LCP. Combined with checkout flow optimization and trust signal design, e-commerce clients see both traffic and revenue lift simultaneously within the first 90 days.

3

Professional Services Dramatically Underinvest in Digital

Law firms, consultancies, and agencies typically have strong offline reputations but weak digital presence. This gap creates massive organic opportunity β€” our professional services clients often see the fastest early gains because the competitive baseline is low.

4

Automation Is the New Competitive Moat

Clients using n8n workflow automation as part of their digital stack report 60% reduction in manual reporting time and 3Γ— faster lead response time. In 2025, automation-integrated websites aren't a luxury feature β€” they're becoming the baseline expectation.

What Clients Say

"stefaan.dev didn't just redesign our site β€” they rebuilt our entire digital acquisition system. Organic traffic up 312% in 5 months. Our CAC dropped by 40%."
MR
Marcus R.
Head of Growth Β· SaaS startup, Series A
"The n8n automation they built saves us 20 hours a week. Every lead is now routed, scored, and followed up automatically. It runs while we sleep."
SP
Sofia P.
Founder Β· E-commerce brand, €2M ARR
"I've worked with 4 agencies. stefaan.dev is the first one that starts by asking for my analytics access instead of my brand guidelines. Night and day difference in outcomes."
DK
David K.
CEO Β· Professional services firm

Our Philosophy: Systems Over Aesthetics

Design without data is decoration. Data without design is a spreadsheet. The intersection β€” where beautiful, fast, intentional interfaces meet rigorous analytics and continuous optimization β€” is where we live and work.

Every client that enters a long-term optimization engagement with us sees compounding returns. The first month shows promise. The sixth month is exceptional. The second year is transformational.

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The Playbook

01 Start with data, not a mood board
02 Build for Core Web Vitals from line 1 of code
03 Design every CTA around intent, not assumption
04 Automate reporting so humans focus on decisions
05 Measure everything; optimize what moves the needle