ZipRecruiter

Log In

1

Mechanical Engineering Associate Jobs in O Fallon, MO

Safe Fleet

Mechanical Engineer II

Saint Louis, MO · On-site

... resolve engineering & technical issues. · Facilitate consistent and predictable alarm & light ... Experience with SolidWorks Simulation is also a plus. · SolidWorks Certification (Associate ...

Safe Fleet

Mechanical Engineer II

Saint Louis, MO · On-site

... times. • Quickly resolve engineering & technical issues. • Facilitate consistent and ... Experience with SolidWorks Simulation is also a plus. • SolidWorks Certification (Associate ...

Roeslein & Associates

2027 Summer Internship

Saint Louis, MO · On-site

$15.75 - $20.25/hr

Mechanical Engineering * Marketing * Piping Design * Process Engineering * Procurement & Supply Chain * Project Engineering * Project Management * Structural Engineering * Systems Engineering ...

New

Code 3

Mechanical Engineer II

Saint Louis, MO · On-site

Quickly resolve engineering and technical issues. * Facilitate consistent and predictable alarm and ... SolidWorks Certification (Associate, Professional, or Expert). * Experience working in an install ...

Hydromat

Mechanical Technician

Maryland Heights, MO · On-site

This position requires: * Associate degree (A. A.) in Industrial Electronics Technology or ... We emphasize continued after sales support in the form of engineering, parts inventory, training ...

Hydromat

Mechanical Technician

Maryland Heights, MO · On-site

This position requires: * Associate degree (A. A.) in Industrial Electronics Technology or ... We emphasize continued after sales support in the form of engineering, parts inventory, training ...

previous pagenext page

Showing results 21-40

All JobsMechanical Engineering Associate JobsMechanical Engineering Associate Jobs in O'Fallon, MO

Mechanical Engineering Associate information

See O Fallon, MO salary details

$42.6K

$96.2K

$155.8K

How much do mechanical engineering associate jobs pay per year?

As of Sep 7, 2026, the average yearly pay for mechanical engineering associate in O'Fallon, MO is $96,240.00, according to ZipRecruiter salary data. Most workers in this role earn between $76,200.00 and $118,300.00 per year, depending on experience, location, and employer.

What is a mechanical engineering associate?

Mechanical Engineering Associates are early-career professionals who support engineering teams in designing, testing, and improving mechanical systems and products. They typically assist with creating technical drawings, conducting experiments, analyzing data, and solving engineering problems under the supervision of senior engineers. This role is often a starting point for recent graduates in mechanical engineering, offering hands-on experience and opportunities to learn industry practices. Mechanical Engineering Associates may work in various sectors, such as manufacturing, automotive, aerospace, or energy.

What are the key skills and qualifications needed to thrive as a mechanical engineering associate?

To thrive as a Mechanical Engineering Associate, you need a solid understanding of engineering principles, CAD design, and problem-solving, typically backed by a bachelor's degree in mechanical engineering or a related field. Familiarity with software such as SolidWorks, AutoCAD, and simulation tools, as well as exposure to industry standards like ASME, is often required. Strong teamwork, attention to detail, and effective communication skills help you collaborate and convey technical concepts clearly. These capabilities ensure high-quality project outcomes and efficient integration within multidisciplinary engineering teams.

What are the most common challenges faced by mechanical engineering associates when transitioning from academic projects to real-world engineering tasks?

One of the most common challenges Mechanical Engineering Associates encounter is adapting to the pace and complexity of real-world engineering projects compared to academic assignments. In industry, projects often involve tight deadlines, multidisciplinary teams, and the need to balance technical accuracy with practical constraints like budget and manufacturability. Associates must also become proficient in using industry-standard software and tools, and learn to interpret and apply company-specific standards. Effective communication with senior engineers and other departments is essential for success in this collaborative environment.

What is the difference between Mechanical Engineering Associate vs Mechanical Engineer?

AspectMechanical Engineering AssociateMechanical Engineer
Required CredentialsAssociate's degree or equivalentBachelor's degree in Mechanical Engineering
Work EnvironmentEntry-level, supporting roles in design, testing, and manufacturingDesign, analysis, and project management responsibilities
Employer & Industry UsageManufacturing, product development, and technical supportDesign firms, industrial companies, and R&D departments

The Mechanical Engineering Associate typically holds an associate's degree and performs support tasks in engineering projects, while the Mechanical Engineer has a bachelor's degree and takes on more complex design and analysis responsibilities. Both roles are essential in engineering teams, but the associate role is more entry-level and supportive in nature.

What are the most commonly searched types of Mechanical Engineering jobs in O'Fallon, MO?

The most popular types of Mechanical Engineering jobs in O'Fallon, MO are:

What cities near O'Fallon, MO are hiring for Mechanical Engineering Associate jobs?

Cities near O'Fallon, MO with the most Mechanical Engineering Associate job openings:

Mechanical Engineering Associate jobs near you
Infographic showing various Mechanical Engineering Associate job openings in O'Fallon, MO as of August 2026, with employment types broken down into 1% As Needed, 68% Full Time, 29% Part Time, 1% Temporary, and 1% Contract. Highlights an 96% Physical, 1% Hybrid, and 3% Remote job distribution, with an average salary of $96,240 per year, or $46.3 per hour.

Associate Principal , Process Mechanical

Sky Mavis

Saint Louis, MO • On-site

$100 - $125/hr

Other

Medical, Dental, Vision, Life, Retirement, PTO

Posted 5 days ago

Job description

About LJC

LJC Design & Engineering (LJC) is a full‑service architecture, engineering, and design firm committed to enhancing the quality of the human experience through integrated design. We are a team of high‑energy professionals who share a passion for design, a collaborative approach, and a casual culture.

The Role

This role is ideal for a highly technical engineering leader with strong industrial process knowledge, sound engineering judgment, and an entrepreneurial mindset. You will lead process design efforts for complex industrial projects, collaborating closely with multidisciplinary teams to deliver safe, efficient, and innovative process solutions that align with our clients’ operational goals.

Specifics of the Role
  • Lead process engineering design efforts for pet food, meat processing, and industrial manufacturing projects
  • Develop project scopes and establish process design basis documentation
  • Create and review Process Flow Diagrams (PFDs), material balances, and Piping & Instrumentation Diagrams (P&IDs)
  • Specify process mechanical equipment and support instrumentation design activities
  • Collaborate with discipline leads to ensure successful implementation of process designs across all project phases
  • Interpret plant operating data and develop process solutions, often utilizing engineering assumptions and judgment in early project stages
  • Ensure process systems are designed safely, efficiently, and in alignment with client operational requirements
  • Utilize and enhance internal engineering tools and standards to support execution efficiency
  • Perform process calculations and simulations using software such as AFT Fathom, AFT Arrow, HTRI, and similar process engineering tools
  • Coordinate with vendors, clients, and internal teams to support equipment selection, process integration, and project execution
  • Support construction, commissioning, startup, and troubleshooting activities as needed
  • Mentor junior engineering staff and contribute to the development of engineering best practices
Requirements
  • Bachelor of Science in Chemical Engineering or Mechanical Engineering from an ABET‑accredited university or college
  • 8–15+ years of experience in process engineering within industrial manufacturing environments
  • Successfully passed the Professional Engineer (PE) exam
  • Strong understanding of process engineering principles, industrial systems, and process safety
  • Experience developing PFDs, P&IDs, process calculations, and equipment specifications
  • Familiarity with lean manufacturing or lean process methodologies
  • Experience with field construction support, commissioning, and process startup activities preferred
  • Strong engineering judgment and ability to design effectively with incomplete or evolving information
  • Excellent communication, leadership, and collaboration skills
  • Entrepreneurial mindset with the ability to thrive in a fast‑paced, design‑build environment
Benefits
  • Discretionary annual bonus subject to company and individual performance
  • Comprehensive benefits package including medical, dental and vision plans, 401(k), generous PTO and paid holidays, employee assistance program, flexible spending accounts, life insurance, disability coverage, learning & development programs and more
Compensation

Salary range for this position is determined by factors such as education, qualifications, skills, training, experience, certifications, internal equity, and location. Compensation decisions are made on a case‑by‑case basis.

#J-18808-Ljbffr

Apply