Critical Infrastructure Mechanical Engineer
Location: Onsite - Marshfield, MO
Reporting to: DCO
OverviewExperienced Mechanical Engineer with expertise in mission-critical infrastructure, industrial facilities, and large-scale engineering projects. Proven ability to support the full lifecycle of critical facilities from design and construction through commissioning, operation, troubleshooting, and continuous improvement. Skilled in root cause analysis (RCA), reliability engineering, HVAC systems, chilled water plants, power generation support systems, and data center infrastructure. Strong track record of collaborating with cross-functional teams to improve availability, efficiency, sustainability, and operational excellence in complex environments at
STN.
Key Responsibilities- Provide full lifecycle engineering support for mission-critical facilities from design inception through construction, commissioning, operation, and ongoing maintenance.
- Serve as the primary mechanical engineering resource for regional infrastructure projects and operational teams.
- Lead troubleshooting efforts, root cause analyses (RCA), and corrective action development for critical equipment and system failures.
- Support operational excellence through technical reviews, procedure development, equipment assessments, and training initiatives.
- Design and implement upgrade projects that increase capacity, improve reliability, enhance energy efficiency, and support sustainability objectives.
- Collaborate closely with operations, construction, commissioning, controls, environmental health and safety, and design teams to maintain engineering standards and operational consistency.
- Conduct engineering audits and site assessments, identifying operational risks and developing mitigation strategies.
- Support new construction projects as a resident engineer, ensuring successful installation, commissioning, startup, and system turnover.
- Manage multiple concurrent projects across various locations while maintaining schedule, budget, quality, and safety objectives.
- Develop innovative engineering solutions that improve facility performance, resilience, and long-term maintainability.
Technical Expertise
- Mechanical Systems
- Air-Cooled Chillers
- Water-Cooled Chillers
- Cooling Towers
- Pumps & Hydronic Systems
- Heat Exchangers
- CRAH Units
- Air Economizers
- Ventilation Systems
- Variable Frequency Drives (VFDs)
- Industrial Water Treatment Systems
- Electrical Infrastructure Familiarity
- UPS Systems
- Diesel Generators
- Electrical Switchgear
- Automatic Transfer Switches (ATS)
- Static Transfer Switches (STS)
- Power Distribution Units (PDUs)
- Controls & Analytics
- Building Management Systems (BMS)
- Supervisory Control and Data Acquisition (SCADA)
- Electrical Power Monitoring Systems (EPMS)
- Data Analytics & Performance Trending
- SQL and Data Querying
- Engineering Reporting & Dashboards
- Automation & Scripting Fundamentals
Experience & Qualifications- Bachelor's Degree in Mechanical Engineering.
- 3+ years of experience supporting industrial, commercial, utility, power generation, oil & gas, or data center facilities.
- Experience with mission-critical infrastructure design, operation, maintenance, or construction.
- Strong understanding of integrated mechanical and electrical systems.
- Ability to read and interpret engineering drawings, specifications, submittals, and applicable building codes.
- Valid driver's license and willingness to travel to project locations as required.
Key Strengths - Strong engineering judgment and technical decision-making.
- Exceptional troubleshooting and problem-solving capabilities.
- Excellent written and verbal communication skills.
- Strong organizational and project management abilities.
- Data-driven approach to reliability and performance improvement.
- Effective collaborator with multidisciplinary teams and stakeholders.
- Comfortable balancing office engineering work with hands-on field support.
- Committed to safety, operational excellence, and continuous improvement.
Compensation- Full-Time, Exempt
- $90,000-$115,000/year, DOE
Benefits- Health Coverage - Medical, Dental & Vision
- FSA Health and Dependent Care available
- 401(k) Plan
- Unlimited Paid Time Off (PTO)
- Observed Holidays Paid
- Cell Phone Allowance
- Collaborative, growth-driven culture
Candidates must be U.S. Citizens or Permanent Residents. We are unable to provide sponsorship at this time.
Employment is contingent upon the successful completion of a background check and reference verification. All applicants must be authorized to work in the United States on a full-time basis.
