Project Engineer III/IV - Water/Wastewater

Gonzalez Companies is a partner‑managed firm that provides comprehensive planning, design, and construction management services to water, sewer, and utility districts and municipalities. We are seeking a Project Engineer (III/IV) in Water/Wastewater to serve our clients and community. This role requires expertise in designing treatment facilities, pipelines and related infrastructure. Department: Water/Wastewater Location: St. Louis, MO Compensation: $80,000 – $95,000 Your Primary Responsibilities Lead the design, analysis, and technical oversight of water and wastewater treatment facilities, pump stations, pipelines, and related infrastructure. Prepare and review engineering calculations, design drawings, specifications, and technical reports. Conduct hydraulic modeling and system analysis to optimize water distribution and sewer collection networks. Manage field investigations, site assessments, and construction observation; provide technical guidance to junior engineers. Develop project scopes, cost estimates, schedules, and proposals; support project management activities. Coordinate multidisciplinary teams to ensure integrated and compliant project designs. Review and ensure compliance with design standards, regulatory requirements, and permitting processes. Serve as a point of contact for clients, contractors, and regulatory agencies; communicate technical information clearly and effectively. Mentor and support junior staff; uphold quality control and company engineering standards. Qualifications Bachelor’s degree in Civil, Environmental, or related engineering field. EI/EIT required; PE registration preferred or in progress. 4–8+ years of experience in water/wastewater design, permitting, or construction support. Proficiency with hydraulic modeling tools (WaterGEMS, SewerGEMS, InfoWater, SWMM, etc.). Strong experience with AutoCAD/Civil 3D; BIM/Revit knowledge preferred. Demonstrated experience with pump systems, process equipment, site layout, and utility design. Excellent analytical, project management, and problem‑solving skills. Strong leadership, communication, and client coordination abilities; capable of mentoring junior engineers. Benefits Competitive salary Major medical, dental, and vision insurance Flexible Spending Account Health Savings Account 401(k) Bonus program Paid holidays and generous paid time off Professional development A team of creative and talented individuals to work alongside Equal Opportunity Employer Gonzalez Companies, LLC provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training. #J-18808-Ljbffr