Compensation: $90,000 – $130,000 Base Salary + Full Benefits + Bonus PotentialWe are seeking a highly motivated Mechanical Design Engineer to join a growing design-build mechanical contractor in the St. Louis market. This individual will play a key role supporting the design, coordination, and execution of complex commercial and industrial mechanical construction projects. The ideal candidate will have strong HVAC system design experience and a desire to work closely with both engineering and construction teams in a fast-paced design-build environment.This is an excellent opportunity for someone looking to gain exposure to large-scale projects while working alongside experienced project managers, engineers, and field operations teams.ResponsibilitiesDesign and develop HVAC and mechanical systems for commercial and industrial construction projectsProduce load calculations, equipment selections, and system layoutsDevelop construction documents, shop drawings, and coordinated BIM/Revit modelsCoordinate with project management, field operations, subcontractors, and clients throughout project lifecycleAssist with design-assist and design-build project deliverySupport value engineering efforts and constructability reviewsParticipate in project meetings and coordination sessionsReview project specifications, submittals, RFIs, and mechanical plansEnsure designs comply with applicable codes, standards, and client requirementsSupport commissioning and project closeout activities as neededPreferred Project ExperienceCommercial HVAC SystemsIndustrial / Manufacturing FacilitiesMission Critical / Data CentersHigher EducationLaboratories / Life SciencesDistribution & Warehouse FacilitiesQualificationsBachelor's Degree in Mechanical Engineering or related field preferred2–10+ years of experience in mechanical HVAC design or mechanical construction engineeringExperience working with Revit, AutoCAD, and BIM coordination toolsUnderstanding of HVAC systems including:VAV SystemsChilled Water SystemsVRF SystemsRooftop UnitsAir Handling UnitsCentral PlantsHydronic SystemsDesign-build or construction-focused engineering experience is highly preferredStrong communication and coordination skillsAbility to work in a collaborative team environmentAnnual Bonus PotentialFull Medical, Dental, and Vision Coverage401(k) with Company MatchPTO and Paid HolidaysCareer Growth Opportunities within a Growing Organization#J-18808-Ljbffr