UNKNOWN

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All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must: Abide by Mastercard's security policies and practices; Ensure the confidentiality and integrity of the information being accessed; Report any suspected information security violation or breach, and. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential.

YEAR

Mastercard Inc

Senior Software Engineer

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Typical office environment, typical construction environment, extreme weather conditions, high noise level, safety hazards (electric currents, working on scaffolding and high places, exposure to chemicals), atmospheric conditions (fumes, odors, dusts, mists, gases, poor ventilation). Use processes such as physical/chemical primary treatment, conventional activated sludge, biological nutrient removal, fixed-film processes, membrane bio-reactors (MBR), sidestream treatment, tertiary filtration, and disinfection.

Black & Veatch Holding Co

Senior Wastewater Process 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. 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

Whether working on highways and bridges or traffic engineering, our team excels in resilient, sustainable design and construction, delivering innovative solutions that address the complexities of modern, multimodal roadway systems and ensure safe, efficient, and reliable travel for all. In this capacity, the successful candidate will be responsible for the following: Perform engineering design tasks for roadway projects from concept development to final design, including construction support.

GFT Infrastructure Inc

Highway / Roadway Project Engineer

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.

Farnsworth Group

Electrical Project Engineer

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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 is seeking a Plumbing Project Engineer to serve as a technical lead and project driver for plumbing design assignments across a range of building systems projects.

Farnsworth Group Inc

Plumbing Project 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. Demonstrated experience designing medium-voltage (up to 35 kV) and low-voltage distribution systems, including utility coordination, generator plants, switchgear, protective device coordination, and cable ampacity analysis (Neher-McGrath / IEEE 399 / IEEE 835) for high-reliability facilities.

Senior Electrical 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 III/IV

PinpointHQ

FULL_TIME

Responsible for engineering physical design and technical support for projects relating to new and existing Bulk, Distribution, and Customer Substations (typically involving voltages up to 138kV). Occasionally provide drawings including one lines, panel layouts, schematics, wiring, and interconnection diagrams for new and existing substations based on scope requirements.

Utilitra

Substation Design Engineer-Physical Design

Talent Acquisition

Trilon Group

Project Engineer III/IV - Water/Wastewater

As a Senior Software Engineer, you'll be a key technical leader, shaping software architecture, solving complex engineering challenges, and helping drive the evolution of critical application capabilities. Partner with Product Owners and development team members to manage sprint priorities, remove impediments, and support the timely delivery of high-quality software capabilities.

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

Design HVAC and mechanical systems (air distribution, hydronic systems, central plant connections, pressurization, and related medical gas interfaces), including load calculations, equipment sizing, layouts, narratives, drawings, and specifications. The Mechanical Project Engineer - Healthcare leads project‑level mechanical design and coordination for hospitals, ambulatory care, behavioral health/recovery centers, and medical office facilities across the Midwest.

Mechanical Project Engineer - Healthcare

Our team of engineers and innovators are developing cutting-edge autonomous solutions to deliver affordable and scalable precision weapons, interceptors, and UAS. Test Planning and Coordination: Develop detailed flight test plans, including objectives, methodologies, safety protocols, and resource requirements.

Zone 5 Technologies

Flight Test Engineer III/IV

Flight Test Engineer V/VI

We’re hiring an experienced Structural Engineer to support and lead building design projects across commercial, municipal, residential, and institutional sectors. This hybrid role offers the chance to manage your own projects, mentor junior staff, and collaborate directly with clients.

Luxus

Structural Engineer (Hybrid Role)

Crelate

Specializing in MEP, Civil, and Structural services, RTM is built around the philosophy of "The RTM Way", a commitment to being a consistent, reliable partner to clients and a supportive, growth-oriented home for engineers. With a focus on sustainable growth and collaborative excellence, RTM provides team members with the resources of a large firm while maintaining a culture of unity, trust, and hands-on mentorship.

Mechanical Engineer III

Responsibilities include supporting permitting, procurement, and field execution, maintaining design documentation, and delivering systems that meet performance, reliability, and energy efficiency goals consistent with ENFRA’s design-build delivery model. Overview: The Electrical Professional Engineer II (PE II) independently performs advanced electrical engineering work, leading the design and coordination of electrical systems for energy and infrastructure projects for healthcare and college campuses.

ENFRA LLC

Electrical Engineer PE II

[AW]-iCims

As the leader in Energy‑as‑a‑Service (EaaS), we integrate engineering, design, construction, financing, and long‑term operations into a single, accountable team—removing traditional barriers between design and execution. Overview: The Mechanical Professional Engineer II (PE II) independently applies advanced engineering techniques to design and coordinate mechanical systems for energy and infrastructure projects across hospital and college campuses.

Mechanical Engineer PE II

Wit $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. Design and specify advanced fire protection systems, including fire suppression (e.g., clean agent systems, pre-action sprinkler systems), fire alarm systems, smoke detection, and emergency life safety systems tailored to mission-critical environments.

Clayco

Senior Fire Protection Engineer

Leidos is seeking an accomplished Mid-Level Software Engineer to join the Chinook Program supporting an Intelligence Community (IC) customer and helping evolve an application supporting important national security objectives. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

Junior Engineer Jobs in St. Louis, MO

Senior Software Engineer Mastercard Inc

Senior Wastewater Process Engineer Black & Veatch Holding Co

Mechanical Engineer - Mission Critical Clayco Inc

Highway / Roadway Project Engineer GFT Infrastructure Inc

Electrical Project Engineer Farnsworth Group

Plumbing Project Engineer Farnsworth Group Inc

Senior Electrical Engineer Clayco Inc

Transportation Project Engineer III/IV Gonzalez Companies

Substation Design Engineer-Physical Design Utilitra

Project Engineer III/IV - Water/Wastewater Trilon Group

Senior Software Engineer Leidos Holdings Inc

Mechanical Project Engineer - Healthcare Farnsworth Group

Flight Test Engineer III/IV Zone 5 Technologies

Flight Test Engineer V/VI Zone 5 Technologies

Structural Engineer (Hybrid Role) Luxus

Mechanical Engineer III Luxus

Electrical Engineer PE II ENFRA LLC

Mechanical Engineer PE II ENFRA LLC

Senior Fire Protection Engineer Clayco

Mid-Level Software Engineer Leidos Holdings Inc

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