Senior Engineer - Mechanical Design

National Design Build Services LLC; United States; Remote; USD 95,000 - 130,000; Full time

Job summary

National Design Build Services (NDBS) is seeking a Senior Engineer to lead day-to-day mechanical design on data centers and large industrial projects. You will own HVAC/R design from basis of design to IFC drawings, run heat load and piping calculations, and coordinate with multi-discipline teams to deliver complete construction documents.

The role includes supervising Design Engineers, reviewing calculations, and supporting prefabrication and field execution.

Qualifications

• Bachelor’s degree in engineering (mechanical preferred).
• Minimum 5+ years HVAC/R design experience; data center, mission-critical or industrial experience preferred.
• Professional Engineer (PE) license preferred, or EIT with ability to obtain a PE.
• Hands-on experience with chilled water, hydronic and process piping design.
• Working knowledge of ASHRAE, International Codes, NFPA, and ASME piping codes.
• Experience guiding or mentoring junior engineers or designers.
• Ability to work to deadlines while juggling several projects and changing priorities.
• Self-motivated, with excellent time and task management skills.
• Strong organization and communication skills, and the ability to work well in a team.

Responsibilities

• Develop mechanical design on assigned projects from basis of design and P&IDs through IFC drawings.
• Perform heat load, hydraulic, psychrometric and pipe sizing calculations; select equipment (chillers, AHUs, pumps, CDUs).
• Prepare drawings, schedules, details and Revit models; run Navisworks clash detection.
• Coordinate with plumbing, structural, electrical, civil and controls designers and sub-consultants.
• Draft sequences of operation and support controls partners on PLC logic and BMS.
• Supervise and mentor Design Engineers; review work for quality and growth.

Job description

About NDBS

National Design Build Services (NDBS) is a mechanical design/build firm based in St. Louis, MO. We design and deliver HVAC, refrigeration and process systems for commercial, industrial and mission-critical facilities, including, food processing, manufacturing, data centers, and refrigerated warehouses. NDBS is part of the Kelso Industries family of MEP+ companies, which shares the core values of Partnership, Innovation, Excellence and Safety. We take projects from design through fabrication and field installation, using off-site prefabrication partners where it improves schedule, quality and job-site safety. NDBS offers an excellent benefits and compensation program and strong career development opportunities.

Senior Engineer

** About NDBS

National Design Build Services (NDBS) is a mechanical design/build firm based in St. Louis, MO. We design and deliver HVAC, refrigeration and process systems for commercial, industrial and mission-critical facilities, including food processing, manufacturing, data centers, and refrigerated warehouses. NDBS is part of the Kelso Industries family of MEP+ companies, which shares the core values of Partnership, Innovation, Excellence and Safety. We take projects from design through fabrication and field installation, using off-site prefabrication partners where it improves schedule, quality and job-site safety. NDBS offers an excellent benefits and compensation program and strong career development opportunities.

Position Description:

The Senior Engineer supports the Lead Engineer on data centers, mission-critical facilities and large industrial plants delivered through design-build and design-assist. You will own the day-to-day mechanical design on assigned projects: running calculations, selecting equipment, developing drawings and models, and coordinating with other disciplines, so design becomes complete, accurate construction documents. You will also supervise and mentor Design Engineers, assigning work, reviewing it for quality, and helping that engineer grow. This role is a direct path toward a Lead Engineer position.

Position Information

Position Type: Full Time

Travel Required: 15%

Department: Engineering

Reporting: Lead Engineer

Direct Reports: Yes

Location: St. Louis, MO 63146 OR Remote, United States

Skills & Responsibilities (including but not limited to):****

• Adhering to NDBS Core Values

  • Safety
  • We Answer Our Phones
  • Always Innovating
  • Collaborative Partnerships
  • Reputation
  • Entrepreneurship

• Design:

  • Develop the mechanical design on assigned projects from the basis of design and P&IDs through milestone reviews and issued-for-construction (IFC) drawings.
  • Perform heat load, hydraulic, psychrometric and pipe sizing calculations, and select equipment such as chillers, air handlers, pumps and CDUs.
  • Prepare drawings, schedules, details and Revit models, and run Navisworks clash detection with other disciplines.
  • Coordinate day-to-day with plumbing, structural, electrical, civil and controls designers and sub-consultants, and bring open issues to the Lead Engineer.
  • Draft sequences of operation and support controls partners on PLC logic and Building Management Systems.
  • Track deliverables, engineering hours and review comments on assigned work, and report status to the Lead Engineer.

• Mission-Critical and Industrial Design:

  • Design data center cooling systems, including chilled water plants, CRAH/CRAC units and fan walls, economizers and containment, applying the redundancy (N+1, 2N, concurrent maintainability) set in the basis of design.
  • Support liquid cooling design for high-density and AI workloads, including CDUs and technology cooling system (TCS) and facility water loops.
  • Design HVAC, process exhaust, compressed air, boiler and hot water systems, and size natural gas, process and utility piping for industrial facilities.
  • Prepare RFIs to close gaps in owner and process-equipment data.

• Supervision of Design Engineer:

  • Assign and schedule work for the Design Engineer, and set clear expectations for scope, quality and deadlines.
  • Check calculations, drawings and models
  • Coach the Design Engineer on design methods, codes, software and NDBS standards, and give regular feedback on performance and development.

• Prefabrication Coordination:

  • Identify where prefabricated pipe spools, skids and modules add value and design them for constructability and repeatability.
  • Confirm design concepts early so prefabricated piping can be released without rework.
  • Review and witness factory acceptance tests and support commissioning and integrated systems testing.

• Project Execution:

  • Take part in internal turnover meetings and help define scope, schedule and resources for assigned work.
  • Support preconstruction with design quantities and scope reviews for estimating.
  • Review trade-partner submittals and draft RFI responses for Lead Engineer approval.
  • Attend coordination meetings with owners, general contractors and trade partners, and use Procore and Autodesk Construction Cloud to manage documents.
  • Support quality control through site visits, field verification and punch lists.

Qualifications and Education Requirements:

• Bachelor’s degree in an engineering field; mechanical preferred.
• Minimum 5+ years of HVAC/R design experience; data center, mission-critical or industrial experience preferred.
• Professional Engineer (PE) license preferred, or EIT with the ability to obtain a PE.
• Hands‑on experience with chilled water, hydronic and process piping design.
• Working knowledge of ASHRAE, International Codes, NFPA, and ASME piping codes.
• Experience guiding or mentoring junior engineers or designers.
• Ability to work to deadlines while juggling several projects and changing priorities.
• Self‑motivated, with excellent time and task management skills.
• Strong organization and communication skills, and the ability to work well in a team.

Preferred Experience and Tools:

• Industrial process experience: process exhaust, compressed air, boilers and natural gas systems.
• Liquid cooling and high-density (AI/HPC) data center experience.
• Experience with design-build and design-assist delivery, and with Procore and Autodesk Construction Cloud.
• Experience with prefabricated mechanical systems such as skids, pipe spools or utility racks.
• Fluency in Revit MEP and AutoCAD; experience with Navisworks clash detection.
• Experience with load software such as Trane TRACE or Carrier HAP

** Work Environment:

The role is mostly office or remote design work, with regular time on active construction sites and in fabrication shops. Site and shop visits require standard PPE and following NDBS and client safety programs.

NDBS is an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability status, protected veteran status, or any other characteristic protected by law.

We’re committed to attracting talented individuals who seek a company with a strong foundation of success and an outstanding culture. We proactively provide competitive compensation, comprehensive benefits, and clear pathways for career advancement with autonomy and flexibility in an entrepreneurial environment.

Learn more about our family of operating companies at www.kelso-industries.com

NDBS is an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability status, protected veteran status, or any other characteristic protected by law.