Sarah Katerina

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In my more than 17 years as an executive in a tax office, I learned that behind every procedure there is something much more valuable: a person making important decisions and trusting you. With that mindset, I founded this firm, specialized in administrative management, real estate transactions, and tax advisory for property purchases and sales on the Costa Blanca.

My purpose is clear: eliminate mistakes, prevent delays, and protect every operation as if it were my own. Because a single incorrectly submitted document can delay a signing for weeks. A misunderstood detail can cost thousands of euros. And incomplete management can lead to penalties, conflicts, and uncertainty that no one wants to face. My job is to make sure that never happens.

“I work with people, not with files.”

Sarah Katerina.

About Us

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ABOUT US ABOUT US

I am the connection between operations and strategy. Between the management that provides stability and the marketing that drives growth.

Through impeccable processes and genuine attention, I help agencies save time, build trust, and strengthen their reputation. Because the best strategy begins with the way you work.

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Years of Experience
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Zero Margin for Error
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One Clear Purpose
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Reasons to Exceed Expectations
Shape OUR TEAM
Sarah Katerina Kastlunger
Sarah Katerina Kastlunger Founder
Igor Veselov
Igor Veselov [CEO]
Elsa Quirós Pérez
Elsa Quirós Pérez Administrative Manager
Iolanda Puertas Morales
Iolanda Puertas Morales Client Relations Manager
Angelica Bernal Pico
Angelica Bernal Pico Client Relations Manager
Dhavalkuamar Rana
Dhavalkuamar Rana Developer
Shape HAPPY CLIENTS
Clientes Felices

“Since they took over our rental, income increased and everything runs smoothly.”

Vacation Rental Management Mette Johansen, Norway

“Their tax advice saved us time and money. True experts in Spanish real estate.”

Tax & Fiscal Advisory Lars Andersen, Denmark

“They managed the whole licence process for us. Fast, clear, and efficient.”

Tourist Licence (VUT) Erik Nilsson, Sweden

“A great partner for our agency. We sell, they manage the paperwork.”

Partnership for Agencies James Turner, UK

“Impressive attention to detail. We always know our documents are in order.”

Document Control Hanna Berg, Finland

“More than a service provider — a real strategic partner.”

Investor Support Oliver Grant, UK

Contact Us

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    • Castillo Homes
    • Tonik
    • VITA Host
    • UCI
    • Dhaval
    • Sarah Katerina
    • Lumon
    • Castillo Homes
    • Tonik
    • VITA Host
    • UCI
    • Dhaval
    • Sarah Katerina
    • Lumon