Water/Wastewater Project Engineer III/IV – Lead Design

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

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.