Outcomes, not
slide decks.
Real commercial results from engagements across CRM, paid acquisition, lifecycle, and growth architecture. Measured against business goals, not vanity metrics.
Client Case Studies
Measured outcomes from CRM, Customer.io, paid acquisition, lifecycle, and conversion engagements across fintech, SaaS, and ecommerce.
Unless noted otherwise, metrics below are first-party case results from Maciej’s engagements—not independent client verification. Role titles are Maciej-confirmed where stated.
bunq
Scaled performance marketing processes and prediction models to lower CAC and raise CLV. Rebuilt the CRM and lifecycle setup, driving measurable retention improvements. Storyteq independently identifies Maciej as bunq’s Head of Performance Marketing (role corroboration, not metric verification).
Dyme
Developed go-to-market strategy for a new vertical in the Netherlands. Built creative testing frameworks, localized messaging, and predictive budget allocation across Google and Meta.
Awesome Maps
Rebuilt acquisition strategy with optimised landing pages and conversion-focused creative testing. Restructured Google and Meta campaigns with improved audience targeting and data-driven attribution.
GUUD Woman
Advised on marketing processes and optimisation setup for better campaign management. Implemented structured workflows for creative testing, budget allocation, and conversion optimisation across channels.
Growceanu
Advised, then owned delivery of Growceanu’s inherited Customer.io workspace: audit, rebuilt flows, and launch journeys for this regulated EU crowdfunding platform. Implementation detail is in the Growceanu Customer.io case.
Maczfit
Designed an event-based Customer.io model: events for carts and orders, Objects only for durable entities such as subscriptions. Maczfit’s engineering team implemented the architecture. Architecture detail is in the Maczfit Customer.io case.
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