Top 178 System engineer Jobs in Saint Peters, Mo

Mid-Level Test Engineer
Leidos —St. Louis, MO
- $87,100 - $157,450 a year
- Full-time
- Azure
- Computer Science
- Mid-level
3d
Continuous Improvement Engineer
Capstone Logistics, LLC. —St. Louis, MO
- $100,000 a year
- Full-time
- Microsoft Outlook
- Math
- Travel
- Health insurance
- Dental insurance
Quick Apply
Engineer Technical Specialist 2
The Structures Company, LLC —Berkeley, MO
- $49.75 an hour
- Contract
- Computer Science
- Bachelor of Science
- Engineering
- Health insurance
- Dental insurance
Quick Apply
Controls Systems Engineer II
Leonardo DRS —Bridgeton, MO
- $79,919 - $103,895 a year
- Full-time
- Hybrid work
- Microsoft Excel
- Engineering
- Mid-level
- Paid parental leave
- Health savings account
Lead Performance Engineer
Apexon —O'Fallon, MO
- $110,143.33 - $132,645.73 a year
- Full-time
- System design
- In-person
- Senior level
- Health insurance
- 401(k)
Quick Apply
Automation Engineer
CBRE —Saint Peters, MO
- Weekends as needed
- Microsoft Excel
- Microsoft Outlook
- Mid-level
- Paid parental leave
- Paid holidays
Junior Network Engineer
Mastercard —O'Fallon, MO
- $76,000 - $127,000 a year
- Online Application
- Computer Science
- Customer service
- Python
- Paid jury duty
- Health savings account
1d
System Design Engineer | FSI
TW Constructors —St. Louis, MO
- Full-time
- Background check
- Construction site
- Pass drug screening
- Disability insurance
- Health insurance
Associate Guidance Navigation and Control (GNC) Engineer
Boeing —Berkeley, MO
- $93,500 - $126,500 a year
- Computer Science
- Bachelor of Science
- Engineering
- Health savings account
- Disability insurance
Infrastructure Engineer
Curium Pharma —Maryland Heights, MO
- Weekends as needed
- Azure
- Computer Science
- Mid-level
System Engineer 3 (contract)
Boeing —Berkeley, MO
- $71 - $76 an hour
- Contract
- Bachelor of Science
- 3 years
- Bachelor's degree
- Health insurance
- Dental insurance
4d
Sr. Mechanical Engineer - HVAC/Building Systems
Farnsworth Group —St. Louis, MO
- Online Application
- Writing skills
- Research
- Mentoring
- Health savings account
- Disability insurance
Quick Apply
Senior Network Engineer – Pacific Region
Computer World Services —Pacific, MO
- Full-time
- Hybrid work
- Windows
- Bachelor's degree
- Mentoring
Software Engineer II- Bridgeton, MO
D&Z Federal Division —Bridgeton, MO
- $42 - $44 an hour
- Computer science
- Computer Science
- System design
Quick Apply
Principal Systems Engineer
D&Z Federal Division —Bridgeton, MO
- $45.50 - $65.00 an hour
- Hybrid work
- Microsoft Excel
- Engineering
- 8 years
Quick Apply
User Engagement Engineer SME
Leidos —St. Louis, MO
- $116,350 - $210,325 a year
- Full-time
- Engineering
- Office
- Master's degree
3d
Design & Analysis Engineer 3
The Structures Company, LLC —Hazelwood, MO
- $72 an hour
- Contract
- Computer science
- Computer Science
- Bachelor of Science
- Health insurance
- Dental insurance
Quick Apply
8d
Senior Systems Engineer- Bridgeton, MO
D&Z Federal Division —Bridgeton, MO
- $38.50 - $55.00 an hour
- Hybrid work
- Computer science
- Microsoft Excel
- Computer Science
Quick Apply
Lead Design and Analysis Engineer
Boeing —Berkeley, MO
- $164,900 - $223,100 a year
- Computer Science
- Bachelor of Science
- Engineering
- Health savings account
- Disability insurance
21h
Principal Systems Engineer (Enterprise scheduling & orchestration platforms )
U.S. Bank National Association —Earth City, MO
- $119,765 - $140,900 a year
- Full-time
- 7 years
- Azure
- System design
- Paid holidays
- Disability insurance
4d

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Mid-Level Test Engineer

Leidos -
St. Louis, MO

Apply Now

Job Details

Full-time
$87,100 - $157,450 a year
3 days ago

Qualifications

Software issue identification
Bug Tracking (Quality assurance practices)
Bug Reporting (Quality assurance practices)
Agile software development
Defect tracking tools
DevOps automation
Project stakeholder communication
Cross-functional communication
Test Planning (Quality assurance practices)

Full Job Description

Description

Job Description:

Are you passionate about delivering high-quality software that directly supports our nation’s security? Leidos is seeking an experienced Mid-Level Test Engineer to join the Chinook Program supporting an Intelligence Community customer. This is an opportunity to work alongside talented engineers, software developers, product managers, and mission experts to build innovative geospatial intelligence capabilities that enable critical national security missions.

If you’re energized by solving complex technical challenges, championing quality throughout the software development lifecycle, and driving continuous improvement in an Agile environment, we’d like to hear from you.

As a Mid-Level Test Engineer, you will play a key role in ensuring the delivery of reliable, secure, and high-performing software solutions. You’ll work as an integral member of a cross-functional Agile Scrum Team, developing and executing comprehensive test strategies that support rapid, iterative delivery while maintaining exceptional quality standards.

This role is ideal for someone who thrives in a collaborative DevSecOps environment and enjoys automating testing, and improving processes.

Position may be performed in the following locations below. Please note Gaithersburg, MD is the program’s primary work location.

Gaithersburg, MD

Alexandria, VA
Chantilly, VA
Englewood, CO
St. Louis, MO
Tucson, AZ

Clearance Level Required:

Active Top Secret/SCI with the ability to successfully pass a Polygraph examination.

Primary Responsibilities:

Lead planning, design, development, and execution of comprehensive test strategies across multiple Agile sprints.
Design, develop, and maintain automated and manual test cases for new and existing capabilities.
Collaborate daily with software engineers, product managers, system engineers, and Scrum Masters to define acceptance criteria and ensure quality is built into every release.
Perform functional, integration, regression, system, and end-to-end testing.
Validate application performance, reliability, security, and usability.
Identify, document, prioritize, and track software defects through resolution.
Support Continuous Integration/Continuous Delivery (CI/CD) pipelines by integrating automated testing into deployment workflows.
Analyze test results, communicate risks, and provide recommendations that improve software quality.
Contribute to continuous process improvement initiatives that enhance Agile team effectiveness.

Basic Qualifications:

US citizenship is required per contract.
Bachelor's degree in Computer Science, Engineering, Information Technology or related field and 4-8 years of prior relevant experience or Master’s with 2-6 years of prior relevant experience.
6+ years of software testing or quality engineering experience.
Experience supporting Agile software development programs.
Demonstrated experience creating and executing manual and automated test plans.
Experience with automated testing tools such as Cypress, Playwright, or equivalent.
Experience with API testing using tools such as Postman or REST Assured.
Familiarity with CI/CD tools including Jenkins, GitLab, Azure DevOps, or similar platforms.
Experience with defect management tools such as Jira.
Ability to communicate results and issues to technical and non-technical customer stakeholders.

Preferred Qualifications:

Experience supporting DoD or Intelligence Community programs.
Familiarity with scripting languages including JavaScript, and Python.
Knowledge of containerized applications using Docker and Kubernetes.
Experience with performance testing tools such as JMeter or LoadRunner.
Familiarity with cloud technologies including AWS, Azure, or OpenShift
Knowledge of DevSecOps pipelines and automated quality assurance practices.
Experience working with modern software delivery environments.
Experience with geospatial applications or GEOINT data.
Certifications such as ISTQB, CASTP, CAST, CSTE, Security+, or similar.

#Chinook

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting:

July 21, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:

Pay Range $87,100.00 - $157,450.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. 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.

About Leidos

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com.

Pay and Benefits

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits.

Securing Your Data

Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at [email protected].

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.

Apply Now

Refine Your Search

system engineer jobs in saint peters, mo

Mid-Level Test Engineer

Continuous Improvement Engineer

Engineer Technical Specialist 2

Controls Systems Engineer II

Lead Performance Engineer

Automation Engineer

Junior Network Engineer

System Design Engineer | FSI

Associate Guidance Navigation and Control (GNC) Engineer

Infrastructure Engineer

System Engineer 3 (contract)

Sr. Mechanical Engineer - HVAC/Building Systems

Senior Network Engineer – Pacific Region

Software Engineer II- Bridgeton, MO

Principal Systems Engineer

User Engagement Engineer SME

Design & Analysis Engineer 3

Senior Systems Engineer- Bridgeton, MO

Lead Design and Analysis Engineer

Principal Systems Engineer (Enterprise scheduling & orchestration platforms )

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