Senior Mechanical Engineer

iENG Design Opportunity: Senior Mechanical Engineer iENG Design is seeking a qualified professional to join our Engineering team. iENG’s method of engineering is unique: we begin with the end in mind, and we challenge everything. We take time to understand the project we want to deliver. We understand the owner’s views, use of building, the owner’s operation and maintenance capabilities. We look at first cost v. operation cost v. life cycle cost. Every iENG project has a best value and best design---and that’s what we deliver. An IMI Company, iENG serves nationwide Fortune 500 clients across the Institutional, Commercial and Industrial markets---there isn’t a project our team cannot tackle. IMI Companies also include icon Mechanical, eagle Controls, and iSuite. iENG Design is headquartered in Chesterfield, MO and has branch offices in Granite City, IL, Nashville, TN and Charlotte, NC. Services & Capabilities include: Engineering & Design, VDC/BIM Coordination, Construction Support, Scheduling, Commissioning, Retro Commissioning and Inspection Services. iENG currently ranks as one of the largest engineering/design firms by revenue in the region. IMI was recently awarded 1st Place at the Best Places to Work Awards hosted by the St. Louis Business Journal. We are currently looking for a Senior Mechanical Engineer to join our Engineering team located at our office in Chesterfield, MO . Our ideal candidate has 8+ years of experience as a Mechanical Design‑Build Engineer or in a similar role. They will be a self‑starter who brings strong leadership, direction, and commitment to our projects. Primary responsibilities Leading mechanical design and implementation projects, ensuring timelines, budgets, and quality standards are met. Designing, specifying, and selecting mechanical systems and components, considering factors such as energy efficiency, cost, and regulatory compliance. Performing load calculations, airflow analyses, and other technical assessments to inform system sizing and design. Ensuring all designs meet relevant local and international codes, standards, and safety regulations, including ASHRAE, LEED, and NFPA standards. Preparing and reviewing technical documents, including design drawings, specifications, equipment selections and submittals, and cost estimates. Overseeing installation, testing, commissioning, and troubleshooting of HVAC systems to ensure quality and functionality. Providing technical guidance and mentorship to junior engineers and project teams. Collaborating with clients and owners to understand project requirements and provide technical support and recommendations. Primary qualifications Bachelor’s degree in Mechanical Engineering (or related engineering degree from an accredited institution). 8+ years of relevant mechanical engineering design or design‑build experience with a focus on HVAC and piping systems design. Plumbing knowledge is a plus. Professional Engineer (PE) license is preferred. LEED Accreditation is a plus. Proficient in HVAC design software (e.g., AutoCAD, Revit, Trane Trace, Carrier HAP) and building management systems (BMS). Excellent communication and interpersonal skills, with the ability to work effectively with clients, contractors, internal and external teams. Proven experience in mentoring junior engineers and guiding teams to success. Strong work ethic and ability to work well with both a team and independently with minimal supervision. Ability to work within an environment with deadlines; when tasked with multiple duties your attention to detail stays consistent. Compensation and Benefits Employee Stock Ownership Program Experience‑based salary Discretionary Annual Bonus Health Insurance Vision Insurance 401(k) with Discretionary Company Contributions Paid Time Off (Vacation; Sick Time) Paid Company Holidays Tuition Reimbursement Program Employee Assistance Program Diversity Our commitment to diversity and inclusion starts with us. The IMI companies strive to build a team that is truly reflective of the communities we serve in every level of our business. We know that when diverse minds and perspectives come together, the possibilities are limitless. Why iENG Design? The iENG team is led by innovative engineers with vast experience across multiple industries. Their passion and understanding of the design & construction process results in a higher level of excellence within our entire engineering & design group. IMI companies know that to tackle the challenging projects we are faced with every day takes a team of creative problem solvers who aren’t afraid to be bold. Which is why IMI companies work every day to create a work environment that gives back to our employees. We take pride in supporting our own. Our philosophy is to hire talented people, provide them with the training, tools, and resources to be successful, empower them to go and contribute to the success of the company, and to reward performance. If you’re ready to be a part of our team AND a part of our solution, APPLY TODAY! Equal Opportunity Employer

EOE/M/F/V/D

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