Meet Our Team

  • Alex Asianov
    Alex Asianov

    Founder & President

    Alex founded DOOR3 in 2002 and serves as President. He brings nearly 25 years of expertise in operations management and analysis, including business process engineering, systems architecture and integration, and project management of globally distributed software delivery. Prior to starting DOOR3, Alex worked as an enterprise architect and technology strategist.

  • Jonathan Blessing
    Jonathan Blessing

    Chief Executive Officer

    As CEO, Jonathan sets the direction of travel for DOOR3’s global team. He brings more than a decade of chief executive experience to the role, along with technical expertise borne from years of coding and designing information systems. Jonathan ardently maintains DOOR3’s commitment to intellectual honesty and integrity of action as we build and modernize business applications for Fortune 1000 organizations.

  • Tetiana Babiy
    Tetiana Babiy

    Director of Kyiv Operations and People Strategy

    Tetiana opened DOOR3’s office in Kyiv in 2014 and has grown and managed our operations in Ukraine ever since. She contributes to DOOR3’s culture and business growth, with almost 20 years of experience in human resources, IT operations, and consulting. As Director of People Strategy, Tetiana is responsible for attracting and retaining the best talent, enriching our culture, and supporting our organization’s strategic objectives.

Principal Consultants

  • Michael Montecuollo
    Michael Montecuollo

    Director of Principal Consulting

    Michael leads DOOR3’s consulting arm and manages the practice. In his work as Director of Principal Consulting, he also oversees all client engagements at DOOR3 and takes an active role in strategy and solving our clients’ challenges. Michael brings over 14 years of experience in digital strategy, product development, user experience, design, and technology to the team.

  • Matt Dilmer
    Matt Dimler

    Principal Consultant

    With 25-plus years in software and consulting, Matt brings experience working with Fortune 1000 companies to his engagements at DOOR3. He continuously seeks to innovate in his work, which has ranged from modernizing an entire e-commerce suite to hands-on software development to overseeing automation strategy and architecture.

  • Stefan Berreth
    Stefan Berreth

    Principal Consultant

    As a Principal Consultant based in Zurich, Switzerland, Stefan is responsible for managing accounts in both North America and Europe. He brings 25 years of international experience in the software industry, ranging from security consulting to software development to interactive design. Stefan has overseen software pre-sales and practice management, while working in technical account and customer success management with U.S. companies operating globally and in European, Middle Eastern, and Asian markets.

Practice Leads

  • dima-kushch
    Bart Michalak

    Business Analysis Practice Lead

    As the Practice Lead for the Business Analysis team, it is Bart’s responsibility to define the methodologies that guide project analysis and solution shaping. A passionate problem solver by nature, his approach is centered around a commitment that solutions should be tailored with careful consideration of the landscape in which they exist. Bart has more than five years of experience helping distributed implementation teams solve business problems with elegant technical solutions.

  • dima-kushch
    Dima Kushch

    Engineering Practice Lead

    Dima leads DOOR3’s engineering team, ensuring the products we deliver are of the highest quality. He has 10 years of experience developing and delivering custom software and web-based applications across a variety of clients and industries, and prioritizes selecting the best approach and technology to fit each project. Dima brings a strong product and design sensibility, along with attention to detail, to all of his work.

  • Leadership | DOOR3
    Tom McClean

    UX & Design Practice Lead

    As Lead UX designer, Tom is passionate about working with our partners to deliver innovative and functional solutions that lie at the intersection of user needs, business goals and tech capabilities. Tom brings over 10 years of experience in Graphic design, art direction and UX/UI design. His varied career has taken him to Berlin, Hamburg, Barcelona and New York. His approach combines solid graphic design fundamentals with design thinking methodologies to deliver clean, sophisticated, and purpose-driven solutions.

  • Robert Miller
    Robert Miller

    Director of Solution Architects

    Robert has been with DOOR3 for 10 years, and serves as Director of the Solution Architects group. Bringing over 20 years of both enterprise and start-up experience, Robert is integral in shaping the direction of technology and implementation at DOOR3. Robert leads the company’s efforts for .NET development, creating the standards and practices that help guide the engineering team.

  • Sergey Matyash
    Sergey Matyash

    QA Practice Lead

    As QA Practice Lead at DOOR3, Sergey is responsible for managing our quality assurance team and verifying that all products being developed meet the acceptance criteria for delivery to clients. He brings more than eight years of experience in the industry, with more than five years in test automation. He has worked with a range of technologies and tools and helped launch a wide array of successful products.

  • Val Kerzhentseva
    Val Kerzhentseva

    Project Management Practice Lead

    Val is focused on building great teams as Practice Lead for Project Management (PM) at DOOR3. Her group is responsible for ensuring high-quality delivery and continually improving our processes. Val strongly believes that great PMs should maintain a global view, while being ready to dig into detail.

  • Dmytro Onypko
    Dmytro Onypko

    DevOps Practice Lead

    As DevOps Practice Lead, Dmytro’s diverse exposure to infrastructure, programming languages, and applications allow him to lead a team that successively models and implements complex systems for our clients. He stays abreast of industry trends and best practices, ensuring that DOOR3 builds reliable, secure, and performant infrastructure while keeping costs low.

Meet Our Delivery Team Leaders

Our Offices

  • New York, NY

    Our flagship office in the heart of midtown Manhattan.

  • Austin, TX

    Local support in one of America’s fastest growing technology markets.

  • Zurich, Switzerland

    Bringing 25 years of international experience.