Project Engineer III/IV - Water/Wastewater

Mannik Smith Group; Clayton (MO); On-site; USD 80,000 - 95,000; Full time

Benefits offered by this job

Major medical, dental and vision insurance

Flexible Spending Account

Health Savings Account

401K

Bonus program

Paid holidays and generous paid time off

Professional development

Job summary

Mannik Smith Group is seeking a Project Engineer III/IV for their Water/Wastewater Department in Clayton, Missouri. This role involves leading design and oversight of water and wastewater facilities, managing field investigations, and mentoring junior engineers. Candidates should possess a Bachelor's degree in a related field, along with 4-8+ years of applicable experience and proficiency in hydraulic modeling tools such as WaterGEMS. Competitive benefits include major medical insurance, 401K, and a flexible working environment.

Qualifications

• 4–8+ years of experience in water/wastewater design, permitting, or construction support.
• Demonstrated experience with pump systems and utility design.
• Excellent analytical and project management skills.

Responsibilities

• Lead design and technical oversight of water/wastewater facilities.
• Prepare engineering calculations, design drawings, and specifications.
• Manage field investigations and provide guidance to junior engineers.

Skills

Hydraulic modeling

AutoCAD/Civil 3D

Leadership

Problem-solving

Education

Bachelor’s degree in Civil, Environmental, or related field

EI/EIT required; PE registration preferred or in progress

Tools

WaterGEMS

SewerGEMS

InfoWater

SWMM

Job description

Project Engineer III/IV - Water/Wastewater

Department: Water/Wastewater

Employment Type: Full Time

Location: St. Louis, MO

Reporting To: Jeff Shiner

Description

Gonzalez Companies is a partner managed firm that provides comprehensive Planning, Design, and Construction Management Services to large and small Water, Sewer and Utility Districts; Departments of Transportation; and municipalities. We are currently seeking a Project Engineer (III/IV) - Water/Wastewater to help serve our connection of clients and community. If you’re hungry for knowledge, ready to make a difference and dedicated to providing personalized attention to our clients, we want you on our team.

The projected range of compensation in Illinois for this job is $80,000 - $95,000.

Your Primary Responsibilities will include

• 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.

What you’ll need

• 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.

Gonzalez Offers Competitive Benefits including:

• Competitive salary
• Major medical, dental and vision insurance
• Flexible Spending Account
• Health Savings Account
• 401K
• Bonus program
• Paid holidays and generous paid time off
• Professional development
• A team of creative and talented individuals to work alongside

Gonzalez is a rapidly growing, dynamic, professional services firm specializing in civil engineering, construction management, and construction inspection. Our clientele includes large and small water, sewer, and utility districts; departments of transportation and other public transportation agencies; and municipalities throughout the Midwest.

Working primarily in the Greater St. Louis, Chicago, and Louisville metro areas, Gonzalez offers a great work environment, generous benefit packages, and opportunities to succeed in many professional disciplines.

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.