Mechanical Engineer

Clayco is a full-service, turnkey real estate development, master planning, architecture, engineering, and construction firm that safely delivers clients across North America the highest quality solutions on time, on budget, and above and beyond expectations. With $8.1 billion in revenue for 2025, Clayco specializes in the "art and science of building," providing fast track, efficient solutions for mission critical, industrial, life sciences, power & energy, aviation, commercial, institutional, residential and sports & entertainment related building projects.

LJC Design & Engineering is a full-service architecture, engineering, and design firm committed to enhancing the quality of the human experience through integrated design. We are a team of high-energy professionals who share a passion for design, a collaborative approach, and a casual culture. We solve challenges by leveraging the collective expertise and ingenuity of the best and brightest minds across development, design, and construction.

The Mechanical Engineer will support the design of mechanical systems for mission-critical facilities, including data centers, advanced manufacturing plants, and other high-availability environments. Working alongside a Senior Mechanical Engineer on each project, this mid-level role is responsible for producing detailed mechanical designs, performing analyses, and coordinating with multi-disciplinary teams to deliver infrastructure that meets demanding uptime and efficiency requirements in a fast-paced environment.

• Develop mechanical designs for mission-critical projects under the direction of a Senior Mechanical Engineer, ensuring compliance with industry standards, codes, best practices and client requirements.
• Perform detailed calculations and analyses such as load calcs, pipe pressure drop, duct pressure drop, PUE, WUE etc.
• Produce mechanical design deliverables including drawings and specifications.
• Delegate tasks to junior engineers, oversee their progress, and provide technical guidance, mentorship and training.
• Coordinate with other disciplines including civil, structural, architectural, electrical, plumbing, and controls to support integrated design.
• Support construction administration activities, including RFI responses, submittal reviews, and field observations.
• Contribute to client meetings and presentations, support the senior engineer in communicating technical solutions.
• Stay current with emerging technologies and trends in the mission-critical industry.

• BS degree in Mechanical Engineering from an ABET institution required.
• 3-7 years of experience in Mechanical Engineering; mission-critical, data center, or high-tech manufacturing project experience preferred.
• EIT required; PE License preferred or actively pursuing.
• Proficiency in mechanical design software (e.g., AutoCAD, Revit, Trane Trace, Carrier HAP, or similar tools). Proficiency or familiarity with CFD modeling software such as Ansys Fluent, Cadence Reality or similar is a plus.
• Experience with building codes and standards (ICC series, ASHRAE, NFPA etc.) and local/regional codes and regulations.
• Experience working in a design-build or integrated project delivery (IPD) environment is a plus.
• Knowledge of construction workflows and their relationship to design.
• Strong communication, leadership, and problem-solving skills.

• No other builder can offer the collaborative design-build approach that Clayco does.
• We work on creative, complex, award-winning, high-profile jobs.
• The pace is fast!

• 2025 Best Places to Work – St. Louis Business Journal, Los Angeles Business Journal, and Phoenix Business Journal.
• 2025 ENR Top 400 –…