Get 10+ Qualified Appointments in 90 Days (Guaranteed) Without Hiring a Sales Team, Running Ads Yourself, or Wasting Months "Testing"

"Castara built our entire outbound system from scratch and delivered results fast. Within three months we generated over $60,000 in new revenue and landed a major client who still sends us steady contracts. Communication was excellent, the process was smooth, and we always felt genuinely supported — not just treated like another account. Highly recommended.”

“Castara rebuilt our Google Ads funnel for our window installation business, from the campaign structure to landing pages and tracking. In the first six weeks alone, the funnel brought in four closed projects, each worth over €20,000. The results were immediate and concrete. We finally had a predictable, profitable acquisition system — and Marcel guided the entire process with clarity and speed.”

“Castara didn’t just build our Meta ads funnel — he helped shape the entire direction of our business. He created high-converting landing pages, set up the full acquisition system, and then went far beyond advertising. He guided us on strategy, unit economics, pricing, and even our financial structure. His clarity and hands-on support gave us the confidence and systems we needed to grow. Working with him was like having a growth consultant and a performance marketer in one.”

“Castara built our entire lead generation engine from the ground up. He created a system that consistently brought in people raising their hand for a free financial assessment — and it’s still working today. We started with a done-for-you setup and eventually transitioned to building our own client acquisition department with his help. The guidance, structure, and clarity he provided were instrumental in making that shift possible. Marcel didn’t just run campaigns; he helped us build a long-term growth machine.”