Mechanical Design Engineer (Project Engineer)
Location: Collinsville, OK
Compensation:
$100K$130K 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 steam 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, pressure vessels, and related combustion equipment 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
3+ years of experience designing boilers, pressure vessels, HRSG systems, or heat exchangers
Strong knowledge of ASME Section I (boilers) and/or Section VIII (pressure vessels)
Bachelors 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)
Knowledge of ISO 9000
Experience with pressure combustion and ancillary equipment
Work Environment & Culture
Onsite MF, 8:00 AM5:00 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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