Top 180 Software test engineer Jobs in O'fallon, Mo

Mid-Level Test Engineer
Leidos —St. Louis, MO
- $87,100 - $157,450 a year
- Full-time
- Azure
- Computer Science
- Mid-level
2d
Lead Site Reliability Engineer
Mastercard —O'Fallon, MO
- $122,000 - $207,000 a year
- Online Application
- Computer science
- Computer Science
- DevOps
- Paid jury duty
- Health savings account
Mid-Level Backend Software Engineer
Leidos —St. Louis, MO
- $87,100 - $157,450 a year
- Full-time
- Azure
- Computer Science
- System design
Mid-Level Software Engineer
Leidos —St. Louis, MO
- $87,100 - $157,450 a year
- Full-time
- Azure
- Computer Science
- Mid-level
14d
Software Engineer II- Bridgeton, MO
D&Z Federal Division —Bridgeton, MO
- $42 - $44 an hour
- Computer science
- Computer Science
- System design
Quick Apply
Software Engineer I
Mastercard —O'Fallon, MO
- $72,000 - $115,000 a year
- Online Application
- Computer science
- Computer Science
- System design
- Paid jury duty
- Health savings account
2d
Senior Software Engineer
Mastercard —O'Fallon, MO
- $115,000 - $184,000 a year
- Online Application
- 6 years
- System design
- Senior level
- Paid jury duty
- Health savings account
8d
Software Test Automation Engineer
Boeing —Hazelwood, MO
- $87,000 - $105,780 a year
- Computer science
- Computer Science
- Software troubleshooting
- Health savings account
- Disability insurance
Software Engineer II
Mastercard —O'Fallon, MO
- $92,000 - $147,000 a year
- Online Application
- System design
- Mid-level
- SQL
- Paid jury duty
- Health savings account
Software Test Engineer
Boeing —Hazelwood, MO
- $70,000 - $86,000 a year
- Computer science
- Azure
- Computer Science
- Health savings account
- Disability insurance
Lead Software Engineer
Mastercard —O'Fallon, MO
- $140,000 - $231,000 a year
- Online Application
- Azure
- AWS
- Mentoring
- Paid jury duty
- Health savings account
Lead Software Test & Verification Engineer, Phantom Works
Boeing —Berkeley, MO
- $126,650 - $171,350 a year
- Computer science
- Computer Science
- 5 years
- Health savings account
- Disability insurance
Senior Software Engineer– RPPS Platform
Mastercard —O'Fallon, MO
- $115,000 - $184,000 a year
- Online Application
- System design
- Databases
- Mentoring
- Paid jury duty
- Health savings account
Platform Engineer
World Wide Technology Holding, LLC —St. Louis, MO
- Up to $112,500 a year
- Full-time
- Remote
- Mid-level
- Continuous improvement
- US work authorization
- Profit sharing
- Wellness program
Manager, AI Engineering (Tester )
Mastercard —O'Fallon, MO
- $140,000 - $231,000 a year
- Online Application
- Azure
- Computer Science
- Research
- Paid jury duty
- Health savings account
2h
Software Systems Engineer
Boeing —Hazelwood, MO
- $135,000 - $165,000 a year
- Software troubleshooting
- Mid-level
- Bachelor's degree
- Health savings account
- Disability insurance
Mechanical Design Engineer
Quality Stainless Products, Inc. —Maryland Heights, MO
- $70,000 - $90,000 a year
- Full-time
- ERP systems
- Office
- Analysis skills
- Health insurance
- Dental insurance
Quick Apply
3d
Exploitation Specialist/GDAT Software Engineer
Leidos —St. Louis, MO
- $73,450 - $132,775 a year
- Full-time
- Mid-level
- Office
- Windows
Design and Analysis Engineer 3
The Structures Company, LLC —Berkeley, MO
- $73.50 an hour
- Contract
- Computer Science
- 5 years
- Engineering
- Health insurance
- Dental insurance
Quick Apply
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

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Mid-Level Test Engineer

Leidos -
St. Louis, MO

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Job Details

Full-time
$87,100 - $157,450 a year
2 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

software test engineer jobs in o'fallon, mo

Mid-Level Test Engineer

Lead Site Reliability Engineer

Mid-Level Backend Software Engineer

Mid-Level Software Engineer

Software Engineer II- Bridgeton, MO

Software Engineer I

Senior Software Engineer

Software Test Automation Engineer

Software Engineer II

Software Test Engineer

Lead Software Engineer

Lead Software Test & Verification Engineer, Phantom Works

Senior Software Engineer– RPPS Platform

Platform Engineer

Manager, AI Engineering (Tester )

Software Systems Engineer

Mechanical Design Engineer

Exploitation Specialist/GDAT Software Engineer

Design and Analysis Engineer 3

Senior Systems Engineer- Bridgeton, MO

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