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With $8.1 billion in revenue for 2025, Clayco specializes in the ''art and science of building,'' providing fast track, efficient solutions for mission critical, industrial, life sciences, power & energy, aviation, commercial, institutional, residential and sports & entertainment related building projects. Working alongside a Senior Mechanical Engineer on each project, this mid-level role is responsible for producing detailed mechanical designs, performing analyses, and coordinating with multi-disciplinary teams to deliver infrastructure that meets demanding uptime and efficiency requirements in a fast-paced environment.

Clayco Inc

Mechanical Engineer - Mission Critical

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In this role you will be focused on the planning, design, and management of various civil engineering projects including water/wastewater/stormwater and transportation projects for local and government agencies. For ten consecutive years, we’ve been certified as a Great Place to Work®, and our engineers, architects, surveyors, and scientists channel their passion and expertise into making meaningful contributions to the world around us.

Farnsworth Group

Civil Engineer

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This role blends advanced design capability with project leadership, client coordination, and mentorship responsibility, and is expected to drive high-quality delivery across multiple concurrent assignments Posting Locations: Lisle, Normal, Peoria, Champaign, or Springfield, IL; or St. For ten consecutive years, we’ve been certified as a Great Place to Work®, and our engineers, architects, surveyors, and scientists channel their passion and expertise into making meaningful contributions to the world around us.

Electrical Project Engineer

HOUR

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. 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.

Gonzalez Companies

Transportation Project Engineer I/II

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Strong understanding of software testing methodologies, the Agile Software Development Life Cycle (Agile SDLC) the software development lifecycle (SDLC), and the software testing lifecycle (STLC). You'll work closely with software developers, product owners, and mission stakeholders to translate requirements into effective test scenarios, uncover complex defects, and ensure new capabilities meet both functional requirements and operational expectations.

YEAR

SAIC is a premier Fortune 500® technology integrator driving our nation's digital transformation. Our robust portfolio of offerings across the defense, space, civilian, and intelligence markets includes secure high-end solutions in engineering, IT modernization, and mission solutions. Using our expertise and understanding of existing and emerging technologies, we integrate the best components from our own portfolio and our partner ecosystem to deliver innovative, effective, and efficient solutions that are critical to achieving our customers' missions.

We are a team of 26,000 strong driven by mission, united purpose, and inspired by opportunity. Headquartered in Reston, Virginia, SAIC has annual revenues of approximately $7.1 billion. For more information, visit saic.com.

Leidos Holdings Inc

Mid-Level Test Engineer

The Safety Engineer reviews, maintains, implements, and enforces Tarlton's Safety Program, along with federal, state, and local regulations, and coordinates and manages Loss Control efforts as they relate to safety and security on jobsites. Partner directly with subcontractor foremen and superintendents to align their crews with Tarlton's safety expectations before work begins, using influence as much as authority - including pre-task planning, monitoring compliance with project safety requirements, and corrective action follow-up.

Tarlton Corp

Safety Engineer

PART_TIME

Capable of acting as Lead Engineer on moderately complex studies and settings projects which require interfacing with the client, other engineering firms, and other departments within Mesa. Don’t delay, plug in today for an inclusive meaningful career in power, distribution, transmission, engineering, design, technology, or innovation at Mesa Associates, Inc.

Mesa Associates, Inc.

Senior Relay Settings Engineer

Support development of project plans and technical deliverables, including Project Management Plans (PMPs), Quality Assurance Project Plans (QAPPs), Accident Prevention Plans (APPs), Health and Safety Plans (HASPs), Remedial Investigation/Feasibility Study (RI/FS) reports and cost estimates, Proposed Plans (PPs), Records of Decision (RODs), remedial design packages (30%, 60%, 90%, and 100%), Remedial Design/Remedial Action Work Plans (RD/RAWPs), and equivalent RCRA documents. Experience evaluating, designing, or implementing remedial technologies such as in-situ soil and groundwater treatment, groundwater extraction and treatment, thermal treatment, soil vapor extraction, air sparging, dual-phase extraction, permeable reactive barriers, excavation, capping, stabilization, dredging/sediment remediation, and monitored natural attenuation.

Environmental Remediation Engineer

Position requires the ability to serve as a key member of the project design team developing designs and providing direction to junior level engineers and CADD/Technician staff in the areas of civil and site design including but not limited to; grading, storm water design, rail and roadways, utilities, and agency and railroad coordination. Projects are likely to include reconstruction and rehabilitation of industrial infrastructure such as roads, rail, utilities; highways and roads, culverts and storm sewer, stormwater detention, rail grade crossings, signing, pavement marking, and traffic control plans for construction.

Hanson Professional Services Inc

Site Civil Engineer

Direct and support development of project work plans and technical deliverables, including Project Management Plans (PMPs), Quality Assurance Project Plans (QAPPs), Accident Prevention Plans (APPs), Health and Safety Plans (HASPs), Remedial Investigation/Feasibility Study (RI/FS) reports and cost estimates, Proposed Plans (PPs), Records of Decision (RODs), remedial design packages (30%, 60%, 90%, and 100% submittals), Remedial Design/Remedial Action Work Plans (RD/RAWPs), and related technical documents. Experience evaluating, designing, or implementing remedial technologies, including in-situ soil and groundwater treatment, groundwater extraction and treatment, thermal treatment, soil vapor extraction, air sparging, dual-phase extraction, permeable reactive barriers, excavation, capping, stabilization, dredging/sediment remediation, and monitored natural attenuation.

Senior Remediation Engineer

Job Title: Section 508 Compliance Test EngineerJob Category: EngineeringTime Type: Full timeMinimum Clearance Required to Start: SecretEmployee Type: RegularPercentage of Travel Required: Up to 10%Type of Travel: Continental US* * * The Opportunity: Join our team supporting USTRANSCOM's Joint Transportation Management System (JTMS), a mission-critical enterprise platform that modernizes transportation, logistics, and financial operations through SAP S/4HANA ERP integration. Section 508 Compliance Testing: Execute accessibility testing against applicable Section 508 and WCAG success criteria, including keyboard-only navigation, focus order and visibility, labels and instructions, headings and structure, tables, forms, error handling, color contrast, non-text content, reflow, zoom, and screen-reader compatibility.

<span itemprop="name">CACI</span> provides information solutions and services in support of national security missions and government transformation for Intelligence, Defense, and Federal Civilian customers. A member of the Fortune 1000 Largest Companies, the Russell 2000 Index, and the S&amp;P SmallCap 600 Index, CACI provides dynamic careers for over 15,800 employees working in over 120 offices worldwide. Visit <a href="http://www.caci.com" target="_blank" itemprop="url" mns_rt="Company">www.caci.com</a>.<br/>
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      We strive to sustain a corporate culture based on integrity - one that's focused on treating customers ethically and making their priorities our priorities. We pride ourselves in finding and hiring people with the highest intellectual capital, and providing them with challenging opportunities and encouraging their innovation and initiative.

CACI

Section 508 Compliance Test Engineer

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Our client is a boutique consulting firm that employs consultants and professionals with unique skill sets to support the federal government with strategic execution, financial process enablement, IT systems, and Enterprise Resource Planning (ERP) software implementation. Build pipelines and scalable analytic tools using leading technologies (for example, Hadoop, Spark, Kafka, Kubernetes, Terraform, Airflow, AWS, Azure, and GCP).

BizFirst

Data/Technology Enablement – Data Engineer – USTRANSCOM JFOSS

Design lighting, power distribution, signaling, communications and/or telecommunication systems for healthcare, education/higher education and commercial clients per applicable codes. We support equity, diversity, and inclusion efforts that benefit all employees through the leadership of our DEI Council, our Employee Resource Groups which are open to everyone, and other community initiatives.

CannonDesign

Electrical Engineer III

Job Title: Data Test EngineerJob Category: EngineeringTime Type: Full timeMinimum Clearance Required to Start: SecretEmployee Type: RegularPercentage of Travel Required: Up to 10%Type of Travel: Continental US* * * The Opportunity: Join our team supporting USTRANSCOM's Joint Transportation Management System (JTMS), a mission-critical enterprise platform that modernizes transportation, logistics, and financial operations through SAP S/4HANA ERP integration. Pay Range : There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications.

Data Test Engineer

Job Title: SAP SCM Software Test EngineerJob Category: EngineeringTime Type: Full timeMinimum Clearance Required to Start: SecretEmployee Type: RegularPercentage of Travel Required: NoneType of Travel: Local* * * The Opportunity: Pay Range : There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications.

SAP SCM Software Test Engineer

The individual will work with the End to End development and implementation teams, operational end users, and support teams to analyze, build and maintain test plans, test cases, integration testing, and requirements verification testing for data visualizations. The Digital Modernization sector within Leidos has an opening for a Test Engineer with Data visualization experience to support the Global Solution Management - Operations II (GSM-O II) program as a member of Real-Time Visibility (RTV) Team.

Test Engineer

With $8.1 billion in revenue for 2025, Clayco specializes in the ''art and science of building,'' providing fast track, efficient solutions for mission critical, industrial, life sciences, power & energy, aviation, commercial, institutional, residential and sports & entertainment related building projects. Clayco is a full-service, turnkey real estate development, master planning, architecture, engineering, and construction firm that safely delivers clients across North America the highest quality solutions on time, on budget, and above and beyond expectations.

Integrations Engineer

If you're passionate about solving complex technical challenges, learning emerging technologies, and developing software that directly supports mission success, this is an exciting opportunity to grow your career while making a meaningful difference. As a Full Stack Engineer, you'll contribute across the entire software development lifecycle, from crafting intuitive user interfaces to building scalable backend services and integrating secure, cloud-native solutions.

Mid-Level Software Engineer

Pay Range : There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Join our team supporting USTRANSCOM's Joint Transportation Management System (JTMS), a mission‑critical enterprise platform modernizing transportation, logistics, and financial operations through SAP S/4HANA ERP integration.

SAP Software Test Engineer (FI/CO)

Job Title: SAP Software Test EngineerJob Category: EngineeringTime Type: Full timeMinimum Clearance Required to Start: SecretEmployee Type: RegularPercentage of Travel Required: Up to 10%Type of Travel: Continental US* * * The Opportunity: Join our team supporting USTRANSCOM's Joint Transportation Management System (JTMS), a mission-critical enterprise platform that modernizes transportation, logistics, and financial operations through SAP S/4HANA ERP integration. Pay Range : There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications.

Planning Engineer Jobs in Hazelwood, MO

Mechanical Engineer - Mission Critical Clayco Inc

Civil Engineer Farnsworth Group

Electrical Project Engineer Farnsworth Group

Transportation Project Engineer I/II Gonzalez Companies

Mid-Level Test Engineer Leidos Holdings Inc

Safety Engineer Tarlton Corp

Senior Relay Settings Engineer Mesa Associates, Inc.

Environmental Remediation Engineer Leidos Holdings Inc

Site Civil Engineer Hanson Professional Services Inc

Senior Remediation Engineer Leidos Holdings Inc

Section 508 Compliance Test Engineer CACI

Data/Technology Enablement – Data Engineer – USTRANSCOM JFOSS BizFirst

Electrical Engineer III CannonDesign

Data Test Engineer CACI

SAP SCM Software Test Engineer CACI

Test Engineer Leidos Holdings Inc

Integrations Engineer Clayco Inc

Mid-Level Software Engineer Leidos Holdings Inc

SAP Software Test Engineer (FI/CO) CACI

SAP Software Test Engineer CACI

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