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Custom Design & Engineering

Established in 2001, Custom Design & Engineering is a respected structural engineering firm with office in Seattle and Mukilteo. We are passionate about providing exceptional analysis and creative design solutions for a wide range of building projects. Our focus is on maintaining open and effective communication with our clients, ensuring projects are completed on time while upholding the highest quality standards. Whether it's residential, commercial, or multi-family buildings, we offer comprehensive structural engineering services for projects of any scale. By utilizing cutting-edge analysis techniques, we create cost-effective designs that adhere to the latest building codes and address unique design constraints.



  • Client-Centric Solutions and Exceptional Service: At our firm, we hold a steadfast belief that our clients are our top priority. What truly separates us from other firms is our dedication to understand client needs deeply, provide them with customized solutions and deliver the most excellent results on time.  

  • Proving Technical Excellence: Our firm is committed to providing cutting-edge engineering expertise across projects of all scales. With a focus on rigorous analysis and design methodologies, Custom Design & Engineering utilizes the latest software and tools to deliver high-quality, state-of-the-art structural solutions.

  • Collaborative Design and Integration: Our firm embraces a collaborative approach, actively engaging with industry partners including architects, interdisciplinary engineers, contractors, and clients. By fostering effective communication and cooperation, we optimize the integration of structural systems with other building components, ensuring seamless and efficient project outcomes.


  • Regionwide Impact: While our firm currently operates throughout the state of Washington, our strategic vision encompasses expanding our services throughout the entire west coast region within the next decade. To achieve this goal, we strive to undertake substantial projects that make a meaningful contribution to the local advancements in structural engineering, positioning ourselves as a trusted and influential force in the industry.

  • Sustainable Design and Environmental Stewardship: We hold a deep personal conviction for sustainable design and environmental stewardship. Understanding the profound and lasting consequences of construction, we approach every project with a keen awareness of the potential harm that can result from using the wrong materials. As regional pioneers, we integrate eco-friendly practices, promoting resource-efficient structures for a greener future.

  • Continued Learning and Professional Development: While small in size, Custom Design & Engineering, fosters a culture that values continuous learning and professional growth while promoting a supportive environment among team members. We prioritize staying at the forefront of industry advancements through ongoing research, technical courses, and training on cutting-edge software. As we expand, our goal is to ensure that these principles of efficiency and professional development are upheld for all employees.


The Engineers

Alex Moroseos, PE, SE

Principal Structural Engineer


Alex graduated from Seattle University in 1985 with a degree in Structural Engineering, accompanied by a minor in Computer Science. Following his graduation, he embarked on a distinguished career with Boeing, where he dedicated over three decades of service before venturing into establishing his own firm.  Alex got his PE License in 2000 and his SE in 2005. Throughout his professional journey, Alex has amassed profound technical acumen in design of the building the primary frames and skills with the computer finite element analysis. Alex's dedication to staying up-to-date with the latest building codes ensures that every project he undertakes receives thorough consideration, taking into account all aspects and not just the structural component. One of Alex's standout qualities is his knack for tackling complex structural challenges. Thanks to his wealth of experience, he possesses an intuitive understanding that allows him to spot potential issues ahead of time and come up with effective solutions. But there's more to Alex than just engineering! He's a true car enthusiast who knows how to have a good time beyond the confines of his professional pursuits. When the weather is nice in Washington, you might catch him cruising around in his metallic blue car.

Kyriakos Moroseos, PE

Principal Structural Engineer


Kyriakos (Kam) graduated from the University of Washington in 2015 with a degree in Structural Engineering. He honed his expertise while working at a reputable Seattle-based structural firm that specialized in residential projects and multi-family complexes. In 2021, Kam made the decision to join his father, Alex, driven by their shared values and visions of prioritizing client satisfaction and engineering excellence. Kam's exceptional problem-solving abilities enable him to analyze and conquer complex structural challenges, consistently devising innovative solutions. His collaborative leadership style seamlessly integrates all relevant parties in the construction process, including architects, homeowners, and contractors, ensuring successful project outcomes. This proficiency in both technical and interpersonal skills allows him to navigate diverse perspectives and create harmonious working relationships. During his personal time, Kam finds fulfillment in playing various musical instruments, attending boxing classes, and cherishing moments with family and friends.

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