Mechanical Design Engineer (Project Engineer)
Location: Collinsville, OK
Compensation:
• $100K–$30K based on experience
• Bonus: Performance-based (measured by design KPIs)
About the Opportunity
LHH is partnering with a fast-growing engineering and manufacturing organization on a critical search for a Mechanical Design Engineer to join their collaborative team in Collinsville, OK. This role is focused on the technical design and development of industrial boiler systems, specifically the Firetube product line. With a legacy of high-quality engineering, our client is scaling operations and investing heavily in product innovation and design infrastructure.
This is a hands-on, project-based role requiring strong proficiency with ASME Section I and Section VIII pressure vessel design, mechanical calculations, and CAD tools such as SolidWorks and Inventor. Candidates with a background in boilers, pressure vessels, HRSG systems, or heat exchangers will find this opportunity an excellent fit for their technical experience and growth ambitions.
Key Responsibilities
• Design and develop custom-engineered firetube boilers and pressure vessels per ASME Section I and Section VIII
• Perform mechanical calculations using spreadsheets and formula-based code compliance tools
• Generate technical documentation and 3D models using SolidWorks and AutoCAD/Inventor
• Lead troubleshooting efforts for shop and field issues, identifying root causes and implementing corrective design updates
• Collaborate cross-functionally with Sales, QA, Purchasing, Production, and Aftermarket teams
• Support ongoing engineering improvement initiatives and product development
• Assist with QA/QC documentation updates and engineering standardization efforts
Must-Have Qualifications
• 2+ years of experience designing boilers, pressure vessels, or similar equipment
• Strong knowledge of ASME Section I (boilers) and/or Section VIII (pressure vessels)
• Bachelor’s degree in Mechanical Engineering or related field
• Proficiency with SolidWorks and/or Inventor CAD platforms
• Familiarity with combustion equipment: wind box burners, gun-type burners, scroll burners
• Ability to interpret and validate engineering spreadsheets and design calculations
• Strong communication skills and collaborative mindset
Preferred Qualifications
• 5+ years of experience in boiler/pressure vessel design
• Experience with NFPA codes and pressure combustion systems
• Supervisory experience in an engineering or drafting team
• Professional Engineer (PE) license in Mechanical or Structural discipline
• Experience with Inventor (direction of future CAD environment)
Soft Skills
• Strong analytical and critical thinking
• Detail-oriented with a commitment to accuracy and safety
• Ability to manage multiple design projects concurrently
• Self-motivated, collaborative, and solutions-driven
• Strong time management and follow-through
Work Environment & Culture
• Onsite M–F, 8:00 AM–5:00 PM
• Travel is minimal
• Highly collaborative engineering and drafting team
• Opportunity to shape the future of the product line during a high-growth period
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