# Senior Engineer - Mechanical Design at National Design Build Services

> Remote · United States · Senior · Software engineering · open. Source: https://alderhq.app/jobs/greenhouse%3Anationaldbs1%3A5456396008 (read 2026-11-11).

## Facts (observed)

- Company: [National Design Build Services](https://alderhq.app/companies/national-design-build-services)
- Location text: Maryland Heights, MO; National Design Build Services
- Where it can be done from (inferred): Remote · United States (evidence: "Location: Maryland Heights, MO; National Design Build Services")
- Posted: 2026-10-18 (24 days ago)
- First seen by alder: 2026-11-07 · last verified: 2026-11-07
- Reposted: 0 times · edited: 0 times
- Apply on the employer's site: https://nationaldbs.com/careers/?gh_jid=5456396008

## Pay and sponsorship

- Posted pay: not posted
- Market band for similar posted roles (United States, n 4707): p25 $155k, median $180k, p75 $207k

## Description (the employer's text)

### 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

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Data: alder (https://alderhq.app). Cite https://alderhq.app/jobs/greenhouse%3Anationaldbs1%3A5456396008 and the date you read it. Observed facts come from the employer's own listing; location reach, level, family and skills are inferences.