Critical Infrastructure Mechanical Engineer - Marshfield, MO

STN, Inc.; Marshfield (MO); On-site; USD 90,000 - 115,000; Full time

Benefits offered by this job

Health Coverage – Medical, Dental &amp

401(k) Plan

Unlimited PTO

Holidays Paid

Cell phone allowance

Collaborative culture

Job summary

STN, Inc. is seeking a Critical Infrastructure Mechanical Engineer to support mission-critical facilities in Marshfield, MO.

The role covers design, construction, commissioning, operation, and maintenance of complex mechanical systems and data center infrastructure. The ideal candidate has 3+ years of experience in industrial or data center environments, strong RCA and HVAC knowledge, and the ability to work cross-functionally with operations and controls teams.

Qualifications

• Bachelor’s Degree in Mechanical Engineering.
• 3+ years of experience in 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.

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.

Education

Bachelor’s Degree in Mechanical Engineering

Job description

Critical Infrastructure Mechanical Engineer

Location: Onsite – Marshfield, MO

Reporting to: DCO

At STN, we don't just adapt to the digital future, we engineer it. Our mission is to help organizations thrive in a rapidly evolving technology landscape through strategic insight, cutting-edge solutions, and a security-first mindset. We provide end-to-end services spanning cloud consulting, AI infrastructure, and enterprise security, enabling secure, scalable, and future-ready transformation.

As trusted advisors, we align IT investments with business outcomes that drive performance and growth, starting with deep strategic engagement and delivering tailored solutions built for long-term impact.

Our approach is innovation-led and rooted in cybersecurity, with a focus on leveraging the right technologies to solve real-world challenges. We invest in our people and foster a culture of growth, inclusion, and purpose because we believe empowered teams build transformative technology.

Overview

Experienced 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.