Top 121 Associate engineer Jobs in St. Louis, Mo

Mid-Level Backend Software Engineer
Leidos —St. Louis, MO
- $87,100 - $157,450 a year
- Full-time
- Azure
- Computer Science
- System design
Mid-Level SQL Engineer
Leidos —St. Louis, MO
- $87,100 - $157,450 a year
- Full-time
- Computer Science
- Mid-level
- Master's degree
Software Configuration Management Specialist (Associate or Experienced)
Boeing —Saint Charles, MO
- $85,000 - $141,450 a year
- Microsoft Excel
- Computer Science
- Bachelor of Science
- Paid parental leave
- Health savings account
Associate and Mid-Level Software Engineers
Boeing —Berkeley, MO
- $99,450 - $171,350 a year
- Computer science
- Computer Science
- Software troubleshooting
- Health savings account
- Disability insurance
Mid-Level Structural Analysis Engineer
Boeing —Hazelwood, MO
- $103,700 - $140,300 a year
- 5 years
- Bachelor of Science
- Writing skills
- Health savings account
- Disability insurance
Associate Systems Engineer
Boeing —Berkeley, MO
- $91,800 - $124,200 a year
- Computer Science
- Bachelor of Science
- Engineering
- Health savings account
- Disability insurance
Associate Systems Engineer
Boeing —Saint Charles, MO
- $91,800 - $124,200 a year
- Computer Science
- Bachelor of Science
- Engineering
- Health savings account
- Disability insurance
Electrical Automated Test Engineer (Associate or Mid-Level)
Boeing —Berkeley, MO
- $91,800 - $151,800 a year
- Computer Science
- Military
- Bachelor of Science
- Health savings account
- Disability insurance
Software Developer (Mid Level or Senior), Autonomy and Mission Planning
Boeing —Berkeley, MO
- $126,650 - $217,350 a year
- Computer Science
- Bachelor of Science
- Mid-level
- Health savings account
- Disability insurance
Associate Guidance Navigation & Control (GNC) Engineer
Boeing —Hazelwood, MO
- $93,500 - $126,500 a year
- Computer science
- Computer Science
- Bachelor of Science
- Health savings account
- Disability insurance
8d
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
8d
Fatigue Tracking Engineer - Associate/Experienced
Boeing —Saint Charles, MO
- $85,000 - $140,300 a year
- Microsoft Excel
- Bachelor of Science
- Engineering
- Health savings account
- Disability insurance
2d
Fatigue Tracking Engineer - Associate/Experienced
Boeing —Hazelwood, MO
- $85,000 - $140,300 a year
- Microsoft Excel
- Bachelor of Science
- Engineering
- Health savings account
- Disability insurance
2d
Systems Engineer, Associate, Experienced and Senior Level
Boeing —Saint Charles, MO
- $91,800 - $185,150 a year
- Computer Science
- Bachelor of Science
- Engineering
- Health savings account
- Disability insurance
Fatigue Tracking Engineer - Associate/Experienced
Boeing —Berkeley, MO
- $85,000 - $140,300 a year
- Microsoft Excel
- Bachelor of Science
- Engineering
- Health savings account
- Disability insurance
2d
Mid-Level Electrical Controls Engineer
Quantum Solutions, Inc. —Columbia, IL
- $80,000 - $110,000 a year
- Full-time
- Bachelor of Science
- Engineering
- System design
- Health savings account
- Health insurance
Quick Apply
F-22 Air Vehicle Subsystems Mechanical Engineer (Mid-Level or Senior)
Boeing —Berkeley, MO
- $103,700 - $171,350 a year
- Schematics
- Bachelor of Science
- Engineering
- Health savings account
- Disability insurance
Associate Guidance Navigation and Control (GNC) Engineer
Boeing —Hazelwood, MO
- $93,500 - $126,500 a year
- Computer Science
- Bachelor of Science
- Engineering
- Health savings account
- Disability insurance
Systems Engineer - Mid-Level
Assured Consulting Solutions —St. Louis, MO
- $120,000 - $160,000 a year
- Full-time
- 6 years
- Computer Science
- Mid-level
Quick Apply
8d
Missions Systems Software Engineer - Embedded (Associate, Experienced, Senior)
Boeing —Berkeley, MO
- $99,450 - $217,350 a year
- Computer science
- Computer Science
- Java
- Health savings account
- Disability insurance

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Mid-Level Backend Software Engineer

Leidos -
St. Louis, MO

Apply Now

Job Details

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

Qualifications

SQL
Linux
Query management

Full Job Description

Description

If you’ve been building your skills in backend development, object‑oriented programming, and mission‑driven engineering, and you’re ready for work that actually moves the needle, this is the kind of opportunity cleared engineers pursue when they want to grow while making real impact. If you take pride in your craft, enjoy solving meaningful technical problems, and want your work to support a mission with visibility at senior levels, you’ll thrive here.

We’re hiring a Backend Software Engineer to support a high‑visibility, data‑driven application used across the organization for analytics and reporting. You’ll help build and maintain core backend services, develop RESTful APIs, support data‑driven functionality, and contribute to ongoing system enhancements within a Linux‑based environment. Your work will directly support system reliability, performance, and data accuracy for mission stakeholders. Our primary development team operates out of Gaithersburg, MD, but we also support onsite engineers in Chantilly, VA, Alexandria, VA; Aurora, CO; St. Louis, MO; and Tucson, AZ, giving top talent multiple paths to join the mission.

And while the requisition requirements may seem standard fare, the position is not; as it will join a high performing team that is changing the way digital engineering and mission operations intelligence is enabled for our customer.

Why This Role Stands Out

High Impact: Your work supports a widely used application that drives real‑time decision‑making
High Visibility: Collaborate with engineering teams and mission stakeholders across programs
Career Growth: Build deeper expertise in backend development, API design, and scalable systems
Challenging Work: Contribute to complex backend features — not routine maintenance tasks

Essential Responsibilities

Backend Development: Design, develop, test, and maintain backend application components using Java or Python
REST API Development: Develop and maintain RESTful services to support application functionality and system integrations
Object-Oriented Programming: Apply object-oriented design principles to build scalable and maintainable systems
Database Development: Write and modify SQL queries to support application functionality and data retrieval
Data Source Collaboration: Collaborate with internal and external teams to understand data sources, formats, and access methods, and support integration into backend systems
Linux Environments: Develop and troubleshoot applications within Linux-based environments
Data Processing & Business Logic: Implement backend logic for data transformation, processing, and system workflows
Bug Fixing & Enhancements: Identify, debug, and resolve application-level defects and performance issues
Code Quality: Follow coding standards, participate in code reviews, and support documentation efforts

Basic Qualifications

Bachelor’s degree in Computer Science, Software Engineering, or a related field with 4–8 years of experience; or a Master’s degree with 2–6 years of experience
US Citizenship
Active TS/SCI with the ability to successfully pass a Polygraph
Professional experience developing object‑oriented applications in Java or Python
Hands‑on experience building and maintaining RESTful APIs
Basic to moderate experience with SQL capability, including writing queries and working with relational databases
Working knowledge of Linux‑based environments
Ability to work independently on defined tasks within established technical frameworks and deliver reliable results

Preferred Qualifications

Experience with Apache Airflow or similar workflow orchestration technologies
Experience with Spring Boot, Django, or similar backend frameworks
Exposure to CI/CD pipelines (GitLab, Jenkins, etc.)
Familiarity with containerization (Docker, OpenShift)
Exposure to cloud environments (AWS or Azure)
Experience working in Agile development environments

#MARU

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:

April 16, 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.

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Refine Your Search

associate engineer jobs in st. louis, mo

Mid-Level Backend Software Engineer

Mid-Level SQL Engineer

Software Configuration Management Specialist (Associate or Experienced)

Associate and Mid-Level Software Engineers

Mid-Level Structural Analysis Engineer

Associate Systems Engineer

Associate Systems Engineer

Electrical Automated Test Engineer (Associate or Mid-Level)

Software Developer (Mid Level or Senior), Autonomy and Mission Planning

Associate Guidance Navigation & Control (GNC) Engineer

Associate Guidance Navigation and Control (GNC) Engineer

Fatigue Tracking Engineer - Associate/Experienced

Fatigue Tracking Engineer - Associate/Experienced

Systems Engineer, Associate, Experienced and Senior Level

Fatigue Tracking Engineer - Associate/Experienced

Mid-Level Electrical Controls Engineer

F-22 Air Vehicle Subsystems Mechanical Engineer (Mid-Level or Senior)

Associate Guidance Navigation and Control (GNC) Engineer

Systems Engineer - Mid-Level

Missions Systems Software Engineer - Embedded (Associate, Experienced, Senior)

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