Senior Mechanical Engineer - (QA/QC)

The Senior Mechanical Engineer position with DOTec Professional Corporation is a PE-level role focused on mechanical building-system design and coordinated MEP delivery, with hands-on quality control and construction-phase technical oversight. This is a fully on-site position in St. Charles, Missouri requiring regular attendance and occasional approved travel or site visits.

Role Overview

In this role, you will lead mechanical building-system design across loads, ventilation, heating and cooling, air distribution, and related infrastructure. You will also coordinate multidisciplinary MEP deliverables, perform technical review for design documents and equipment selections, and resolve quality and field coordination items through construction. When legally authorized and personally directing and supervising the work, you will assume responsible charge and seal documents.

Key Responsibilities

• Lead mechanical building-system design including loads, system selection, ventilation, heating and cooling, air distribution, hydronic and refrigerant piping, exhaust, central equipment, controls, and energy-efficiency measures.
• Lead or coordinate plumbing design within demonstrated competence, including domestic water, sanitary and storm drainage, natural gas, equipment, utility interfaces, and fire-protection coordination.
• Lead multidisciplinary MEP design teams of engineers, EITs, designers, and drafters by setting criteria, assignments, milestones, review points, priorities, and coordination expectations, while providing practical mentoring and timely technical decisions.
• Perform or review heating and cooling loads, ventilation analyses, duct and piping calculations, pump and fan selections, psychrometrics, energy-code documentation, equipment schedules, and basis-of-design records.
• Review calculations, drawings, specifications, models, reports, and equipment selections for accuracy, code compliance, constructability, maintainability, commissioning readiness, and multidisciplinary coordination.
• Coordinate with project managers, clients, authorities having jurisdiction, utilities, vendors, contractors, and other design professionals; communicate technical risks, staffing needs, scope changes, and additional-services requirements early.
• Resolve permit comments, RFIs, submittals, field conditions, site-observation findings, and commissioning issues; improve MEP standards, details, checklists, and quality-control procedures.
• Assume responsible charge and seal documents only when legally authorized and personally directing and supervising the work.

Required Qualifications

• Bachelor’s degree in mechanical engineering or mechanical-focused architectural engineering from an ABET-accredited or demonstrably equivalent program.
• Active PE license in good standing in a U.S. jurisdiction; Missouri licensure is strongly preferred, or eligibility and willingness to obtain licensure by comity within an agreed onboarding period.
• Eight (8) or more years of progressively responsible A/E consulting or comparable mechanical-design experience, including building systems, construction-document delivery, and leadership of MEP teams.
• Strong command of applicable adopted building, mechanical, plumbing, energy, accessibility, and life-safety requirements, including relevant IBC, IMC, IPC, IECC, ASHRAE, and NFPA provisions.
• Experience with HVAC, controls, ventilation, hydronic or refrigerant distribution, equipment selection, energy compliance, construction services, and BIM coordination; proficiency with Revit and AutoCAD and familiarity with appropriate mechanical-design software.
• Strong technical judgment, leadership, communication, documentation, mentoring, professional ethics, multicultural-team skills, regular on-site attendance, and occasional business travel.

Technologies

• Revit
• AutoCAD

What Success Looks Like

• Mechanical and coordinated MEP deliverables are safe, code-aligned, energy-conscious, constructible, and issued through a predictable quality-control cadence.
• Criteria, calculations, decisions, risks, and review dispositions are documented, and project managers receive reliable technical and staffing forecasts.
• MEP teams work from clear milestones while staff improve through direct mentoring, consistent standards, and accountable follow-through.

Preferred Qualifications

• Master’s degree in mechanical engineering, architectural engineering, building science, energy systems, or a related field.
• Multiple state PE registrations and prior service as engineer of record, MEP department or team leader, mechanical discipline lead, or senior technical reviewer.
• Experience with central plants, heat-pump or decarbonization strategies, healthcare, laboratory, industrial, multifamily, mission-critical, renovation, commissioning, or advanced energy-modeling work.

Work Location and Schedule

• Full-time, on-site role at DOTec’s office: 118 North 2nd Street, Suite 200, St. Charles, Missouri 63301.
• Regular schedule: 7:30 a.m. to 4:00 p.m. Central Time, Monday through Friday.
• On-site presence is essential for mechanical and MEP team leadership, supervision, mentoring, document review, and multidisciplinary coordination; no routine remote or hybrid arrangement is available.
• Occasional approved travel or site visits may be required.
• DOTec will consider reasonable accommodations as required by applicable law.

Compensation and Benefits

• Pay: $85,000.00 to $130,000.00 per year, competitive based on experience, licensure, technical scope, leadership responsibility, and assigned duties.
• Company-paid employee medical, dental, vision, and life insurance coverage, subject to plan eligibility and terms.
• Paid vacation: two weeks during the first five years of service, three weeks from five through fewer than ten years of service, and four weeks beginning at ten years of service, administered under Company policy.
• Six Company-paid holidays: New Year’s Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, and Christmas Day.
• Professional licensure and credential-development support, including reasonable reimbursement for approved expenses under Company policy, direct access to executive leadership, and meaningful advancement opportunities as the firm grows.
• Dental insurance
• Health insurance
• Life insurance
• Parental leave
• Vision insurance

Work Authorization

• DOTec does not offer employment-based immigration sponsorship for this position, now or in the future.
• This includes temporary nonimmigrant sponsorship and employment-based permanent-residence sponsorship, including F-1 CPT or OPT, H-1B, H-2A or H-2B, L-1, and TN classifications.

Equal Opportunity and Hiring Notes

• Qualified applicants receive consideration without regard to legally protected status.
• Reasonable hiring accommodations are available.
• Employment is contingent upon required identity and work-authorization verification.
• This posting does not create an employment contract.