The RealWise Collective

The RealWise Collective is a curated network of trusted real estate professionals who share a commitment to thoughtful, client-first service across the Bay Area and beyond. At the heart of it is Stephanie Johnson, whose legacy business spans San Francisco and Sonoma County — two markets she knows deeply and has served for years. Rather than a traditional team, we're independent collaborators — each an expert in our own market — united by the same values that drive RealWise Properties: integrity, local knowledge, and results that actually serve your goals. Whether you're buying or selling in San Francisco, putting down roots in Sonoma County, exploring the Peninsula, or navigating the leasing market across the Bay Area, the Collective works together to meet your specific needs, without ever compromising on the quality of your experience.

Meet the RealWise Collective

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Stephanie Johnson is the founder of RealWise Properties and the driving force behind The RealWise Collective. With over 20 years of experience in San Francisco real estate, she has built a reputation for deep market knowledge, trusted relationships, and results that speak for themselves. Over the last five years, Stephanie has expanded her practice into Sonoma Wine Country, bringing that same dedication to one of Northern California's most sought-after lifestyle markets. Through the Collective, she ensures that collaboration across markets means every client has access to local expertise and a seamless experience — no matter which Bay Area market they're navigating.

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Karen McCarthy is a trusted real estate advisor with 15+ years of experience helping professionals, families, and investors navigate major life transitions with clarity and confidence. Specializing in buying, selling, relocation, downsizing, and investment opportunities, she delivers a strategic, high-touch approach tailored to each client’s goals.

Having built her career in one of the Bay Area’s most competitive markets, Karen is known for solving complex challenges, identifying opportunities others miss, and providing thoughtful guidance through every stage of the process. Her background in technology, entrepreneurship, and ICF coaching allows her to combine market expertise with a client-focused approach rooted in clear communication, trust, and long-term strategy.

 

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Quincie Crisostomo is a licensed real estate agent serving the Peninsula and South Bay, bringing over 20 years of real estate sales experience from the Philippines, where she successfully guided hundreds of buyers, sellers, and investors through one of Asia’s most competitive markets.

Specializing in first-time homebuyers and property investors, Quincie combines strong client advocacy with a relationship-driven approach built on trust, communication, and dedication. As she continues to deepen her Bay Area expertise through property management and leasing, she offers clients valuable insight into local neighborhoods, market trends, and investment opportunities.

Fluent in Filipino/Tagalog, Quincie is committed to making every client feel informed, supported, and confident throughout their real estate journey.

 

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Sergey Maximov is a residential property management specialist with over 10 years of experience helping property owners successfully navigate the Bay Area rental market. With extensive expertise in HOAs, TICs, Co-Ops, and California rental regulations, he provides clients with strategic guidance rooted in market knowledge, transparency, and professionalism.

Known for setting clear expectations and creating seamless experiences for both owners and tenants, Sergey specializes in securing high-quality tenants while managing the complexities of screening requirements, CC&Rs, and property compliance. His hands-on approach and deep understanding of local rental dynamics make him a trusted resource for property owners looking to maximize the value and performance of their investments.

 

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RealWise is a group of top-producing real estate professionals specializing in San Francisco and Sonoma County property sales.

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