99Ways

99Ways works with companies that hand over the technical side of marketing data — tracking setups, event tracking plan audits, product analytics, and A/B testing — so growth runs on systems rather than guesswork. The firm frames its work as decoding the hidden logic behind customer behavior through experimentation, using tools including PostHog and Hyros to build out data strategy and conversion tracking, including server-side (sGTM) implementations.

Services span the full loop from measurement to optimization: analytics and event tracking, heatmaps and session replay, UX research and heuristics, landing page and form/checkout optimization, and personalization built on what the data shows. The division of labor is explicit — 99Ways handles the data systems and technical infrastructure of marketing, freeing clients to focus on growing sessions, leads, sales, and marketing actions rather than managing trackers and test setups themselves. Based in Amsterdam, the agency positions conversion rate optimization and experimentation as a specialist discipline rather than an add-on to broader marketing work, with initial engagement starting through a consultation request.