Selected case studies

Seven years of experiments, redesigns, and revenue work.

Below are three deeper case studies from the work I'm proudest of, followed by a short history of roles and a curated set of recommendations from people I've worked with closely.


2024 — 2025 Bikkelhart · Pathé
Case 01

The €2.1M experiment

A small set of high-confidence A/B tests that, together with a long-running optimisation programme, produced one of my largest single-test revenue impacts for a major Dutch cinema brand.

Context

Pathé operates one of the largest cinema networks in the Netherlands. The ticketing and booking flow is a high-traffic, high-stakes funnel where small frictions translate into meaningful revenue.

Approach

  • Funnel and segment analysis in GA4 to pinpoint the highest-leverage moments in the booking journey.
  • On-site behavioural research (Hotjar session replays, heatmaps) to qualify what the data was telling us.
  • Hypotheses grounded in behavioural psychology — choice architecture, friction reduction, trust signals.
  • Sequential A/B tests in VWO with strict significance and guardrail thresholds before rollout.

Outcome

The combined uplift across top-performing tests delivered €2.1M in incremental revenue, and the working pattern became a template I now apply across other large e-commerce clients.

€2.1M
Incremental revenue from top tests
High
Statistical confidence on shipped variants
8-fig.
Overall client revenue growth contributed to
2021 — 2025 Bikkelhart
Case 02

+108% conversions from a research-led redesign

A full site redesign that wasn't allowed to ship until it had been validated, piece by piece, by more than a hundred live A/B tests against the existing experience.

Context

A long-term client wanted a redesign for the right reasons — strategy was shifting, the brand had evolved — but a wholesale rebuild on intuition is one of the biggest risks in CRO. So the redesign became a CRO programme in disguise.

Approach

  • 100+ A/B tests across the funnel, sequenced from highest-traffic pages downward.
  • Patterns that won were promoted into the redesign system; losing ones were killed before launch.
  • Hotjar + GA4 + qualitative interviews built a behavioural model behind each hypothesis.
  • Cross-functional delivery as Project Manager — data, copy, UI, dev — on Agile/Scrum cadence.

Outcome

The new site shipped with +108% conversion rate against the prior experience, a 79% positive significance rate across tests, and the engagement grew from CRO-only into full-service data, marketing and design work.

+108%
Conversion rate vs. prior site
100+
A/B tests across the programme
79%
Positive significance rate
2026 — Now Curamando
Case 03

AI-assisted dashboards that cut analysis time by up to 400%

Internal tooling that re-shapes how a consultancy's Growth & Commerce department produces audits, dashboards, and recurring client analytics work.

Context

At Curamando, recurring analytics work — audits, weekly dashboards, performance reports — was high-value but high-effort. The bottleneck wasn't insight; it was the time cost of data gathering, formatting and first-pass interpretation.

Approach

  • Mapped the time-sink steps across the analyst workflow: data pull, normalisation, first synthesis.
  • Built AI-powered dashboarding and data-gathering tools that automate those steps.
  • Embedded the tools into the actual cadence of client delivery, not just as a one-off prototype.
  • Documented a new way of working for the Growth & Commerce department to adopt.

Outcome

Up to 400% reduction in time cost for data analysis projects, freeing senior consultants to spend their hours on interpretation and recommendation rather than data plumbing.

−400%
Time cost on analysis projects
Department-wide
Adoption across Growth & Commerce
AI-native
Modernised the analyst workflow
Work history

Where I've worked.

Jan 2026 — Now

CRO Specialist & Delivery Manager

Curamando · Amsterdam

Building AI-powered dashboarding and data-gathering tools for the Growth & Commerce department. Modernising the way recurring analytics work gets done.

Mar 2021 — Dec 2025

CRO Specialist & Delivery Manager

Bikkelhart

Led CRO programmes and full-site redesigns for clients including Pathé. Grew CRO engagements into full-service data, marketing and web design work. Managed cross-functional delivery on Agile/Scrum cadence.

Sept 2019 — Feb 2021

Growth Hacker & (Pre-Sales) Solutions Consultant

Leapforce

Custom websites up to €70k, including an evidence-based optimisation project that doubled revenue in 3 months. Led design thinking workshops and B2B SaaS marketing research.

Dec 2017 — Nov 2018

DevOps Engineer & PMO

ING

Introduced PowerBI as the data visualisation solution for InfraNL, built PowerShell tooling, led a 7-engineer hackathon team and managed an extensive data warehouse.

In their words

Selected recommendations.

"An enthusiastic and always surprising colleague. With a great passion for UX research and conversion optimization, Jasper always delivered results. A good mix of practical action and zooming out to scientific models — never afraid to take on tasks just outside the scope."

Ralph KaanGrowth & Content Director, Bikkelhart

"I thoroughly enjoyed working with Jasper for 3 years. He knows how to translate data into clear dashboards, sharp analyses, and concrete optimisations. With his knowledge of tracking, CRO, UX and AI, he helps not only measure what is happening but understand why — and what to do next."

Derik van BemmelSenior Performance Marketing Specialist

"Jasper is a very driven and creative colleague who convinces others in a very natural way. He's like a fish in water giving presentations and workshops. His prowess in workflows, customer journeys and UI designs make him a valuable UX designer, and his empathy lets him improve designs like nobody else."

Joost AnnaertGrowth Manager, Leapforce

"Jasper brought energy, enthusiasm, design expertise and a wealth of sales knowledge to the role. He embraced the challenges we set him and had a record-high conversion rate on sales calls. Extremely open to feedback and quick to adapt to our processes."

Laura FaintMarketing Manager, AJ&Smart
Get in touch

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