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Senior Mechanical Engineer

Job in St. Louis, Saint Louis, St. Louis city, Missouri, 63105, USA
Listing for: LJC
Full Time position
Listed on 2026-10-18
Job specializations:
  • Engineering
    Mechanical Engineer
Salary/Wage Range or Industry Benchmark: 110000 - 150000 USD Yearly USD 110000.00 150000.00 YEAR
Job Description & How to Apply Below
Location: St. Louis

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.

About

LJC

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 Role We Want You For

The Senior Mechanical Engineer will lead the mechanical design of projects, provide technical expertise, and ensure the successful delivery of engineering solutions for mission-critical facilities, including data centers, advanced manufacturing plants, and other high-availability environments.

This role requires expertise in cooling solutions for air-cooled and liquid-cooled ITE and a track record of delivering complex projects in a dynamic, multidisciplinary setting. You will lead and mentor a team of engineers, collaborate with clients and stakeholders, and design high-performance mechanical infrastructure that meets rigorous uptime and efficiency requirements.

The Specifics of the Role
  • Lead the mechanical design for mission-critical facilities, including data centers, advanced manufacturing plants, and other high-availability environments.
  • Perform detailed calculations and analyses, ensuring compliance with industry standards, codes, and best practices.
  • Manage project timelines, budgets, and resources while coordinating with other disciplines.
  • Review and approve mechanical drawings, specifications, and submittals for quality and accuracy.
  • Delegate tasks to engineers and other team members, oversee their progress, and provide technical guidance, mentorship and training.
  • Develop and present detailed reports and design documentation to clients and project stakeholders.
  • Collaborate with project managers to define project scope, schedule, and deliverables, ensuring client expectations are met.
  • Manage and track project changes and ensure adherence to project goals, quality standards, and deadlines.
  • Support the business development team in pursuing new projects by providing input on RFPs and presentations, attending client interviews, identifying risks and mitigation strategies.
  • Oversee construction administration activities, including RFI responses, submittal reviews, and field observations.
  • Develop strong client relationships and effectively communicate project requirements, updates, and challenges.
  • Stay current with industry trends, emerging technologies, and new software tools to improve design processes and results.
Requirements
  • BS degree in Mechanical Engineering from an ABET institution required.
  • 8+ years of experience in Mechanical Engineering, with at least 3 years focused on data center projects.
  • Professional Engineer (PE) License preferred, with the ability to attain licenses in multiple states; highly experienced unlicensed candidates with strong mission-critical design backgrounds are welcome to apply.
  • Strong experience in mechanical systems with working knowledge of plumbing and fire protection systems.
  • Proficiency in mechanical design and production software (e.g.,…
Position Requirements
10+ Years work experience
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