Top 24 senior java developer Jobs in o'fallon, il

Senior Full Stack Developer - Front End
Netrist —Scott AFB, IL
- Full-time
- Remote
- Computer Science
- System design
- Java
- Paid holidays
- Disability insurance
Senior Developer (Security) - Hybrid
Netrist —Scott AFB, IL
- Full-time
- Remote
- Computer Science
- Software troubleshooting
- Java
- Disability insurance
- Health insurance
Sr. Java Programmer
Rely Systems —Belleville, IL
- Mid-level
- Office
- IT
Senior DevOps Software Engineer
Global Enterprise Services, LLC —Swansea, IL
- System design
- 8 years
- SQL
Quick Apply
Java/J2EE developer Sr.
kollasoft —St. Louis, MO
- Contract
- Oracle
- Mentoring
- Senior level
Quick Apply
Sr. Java Developer
Sovereign Technologies —St. Louis, MO
- 5 years
- Bachelor's degree
- Training & development
Application Development Senior Advisor
The Cigna Group —St. Louis, MO
- Online Application
- 5 years
- Engineering
- SQL
4d
Senior Software Engineer
Equifax —St. Louis, MO
- Full-time
- Hybrid work
- Azure
- 5 years
- System design
- Health insurance
- Paid time off
Senior .NET Developer
Sovereign Technologies —St. Louis, MO
- Computer science
- Computer Science
- Mid-level
Sr. Java/Web Developer
Sovereign Technologies —St. Louis, MO
- Computer Science
- Bachelor of Science
- SQL
Guidewire PolicyCenter Sr Developer
Deloitte —St. Louis, MO
- $116,200 - $229,100 a year
- Full-time
- Azure
- Oracle
- Up to 50% travel
8d
Sr. Developer
Sovereign Technologies —St. Louis, MO
- Computer Science
- Master's degree
- SQL
Sr Software Engineer
Federal Reserve Bank of St. Louis —St. Louis, MO
- $140,000 - $170,000 a year
- Full-time
- 7 years
- Mentoring
- Senior level
- Health insurance
- Paid time off
Senior Software Engineer, Core Experiences - St. Louis, MO, USA
Speechify —St. Louis, MO
- $140,000 - $200,000 a year
- Remote
- System design
- Senior level
- Negotiation
Senior Level Software Developer
DCS Corp —St. Louis, MO
- Computer science
- Azure
- Computer Science
C# Developer (Jr and Sr Roles)
Fabergent —St. Louis, MO
- Customer service
- Mid-level
- Windows
Quick Apply
Senior Software Engineer
Omni Federal —St. Louis, MO
- Full-time
- Computer science
- Computer Science
- Bachelor of Science
Quick Apply
Senior Software Engineer, Technology Solutions
NISA Investment Advisors, LLC —St. Louis, MO
- Full-time
- Computer science
- Computer Science
- 5 years
- Wellness program
- Health insurance
Senior Software Engineer
Radiance Technologies —St. Louis, MO
- Full-time
- Computer Science
- Software troubleshooting
- 5 years
- Dental insurance
- 401(k)
Senior Software Engineer
Trevity LLC —St. Louis, MO
- Full-time
- Azure
- PMP
- System design
Quick Apply
8d

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senior java developer jobs near o'fallon, il

Senior Full Stack Developer - Front End

Netrist
Scott AFB, IL

Apply Now

Job Details

Full-time

Benefits

Paid holidays
Visa sponsorship
Disability insurance
Health insurance
Dental insurance
Flexible spending account
Paid time off
Work from home
Vision insurance
401(k) matching
Life insurance

Qualifications

Software engineering

Full Job Description

Job Information

Date Opened

03/10/2026

Job Type

Full time

Work Experience

5+ years

Industry

Technology

City

Scott Air Force Base

State/Province

Illinois

Country

United States

Zip/Postal Code

62225

Job Description

We are seeking a Senior Full Stack Developer (Frontend Emphasis, React.js) to build and sustain a mission critical command and control system for the Mobility Air Force. Your work will focus on developing modern single page applications using React.js and TypeScript, improving the user experience, and ensuring seamless integration with secure backend APIs. You will contribute across the stack, but your specialization will be front end architecture, UI performance, and maintainable component development.

You will collaborate closely with backend developers, guide UI design decisions, and mentor junior engineers within an Agile development environment.

What you will do

Design, implement, test, and deploy single page applications built with React.js and TypeScript.
Participate in front end architecture decisions, including state management, component structure, routing, and build configuration.
Develop reusable UI components, forms, and interactive views aligned with mission workflows.
Integrate React applications with Java and .NET backend services and RESTful APIs.
Build automated tests for the UI, including unit, integration, and end to end tests.
Ensure accessibility, responsiveness, and adherence to modern UI best practices.
Optimize performance through code splitting, lazy loading, and efficient rendering strategies.
Implement secure front end patterns, including dependency hygiene, API input validation, and token handling.
Review and refactor front end code to ensure maintainability and consistent patterns.
Mentor team members on React, TypeScript, testing strategies, and SPA architecture.

What we like to see

Strong proficiency with React.js, TypeScript, SPA architecture, and modern JavaScript tooling.
Experience with front end state management solutions such as Redux, Zustand, Recoil, or Context APIs.
Familiarity with build tools such as Webpack, Vite, Babel, or similar.
Experience consuming RESTful APIs and collaborating with backend developers to shape API contracts.
Understanding of accessibility and compliance standards common in government systems.
Experience deploying front end applications to AWS services such as S3, CloudFront, API Gateway, and Cognito.
Strong troubleshooting skills in UI performance, rendering, and cross browser compatibility.
Self directed with the ability to own features from concept to production.

You should be familiar with

HTML, CSS, JavaScript, and TypeScript.
React.js, React Router, and component-based architecture.
SPA security patterns for authenticated applications.
Modern front end testing frameworks such as Jest, React Testing Library, and Cypress.
RESTful API integration patterns.
Basic backend development in Java or .NET for full stack feature work.
Containerization concepts using Docker.
CI/CD practices for building, testing, and deploying front end assets.
Agile methodology.

Requirements

Minimum Experience: 5+ years of professional software development, including substantial front-end experience with React.js.
Experience owning front end architecture or major UI components in production SPA applications.
Bachelor’s degree in Computer Science, Engineering, or related field, or equivalent experience.
Ability to obtain or maintain a government security clearance.
Prior DoD or federal experience is strongly preferred.

This position is eligible for remote work in the St. Louis area. However, the position requires a government security clearance, so candidates must be U.S. citizens and eligible for work without a visa sponsorship

Benefits

Competitive Salary
Paid Time Off
Paid Federal Holidays
401K with matching
100% Paid Medical, Dental, Vision, Long & Short Term Disability, and Basic Life
Flexible Spending Account
Health Reimbursement Arrangement
Work From Home Options
Education Assistance

Apply Now

Refine Your Search

senior java developer jobs in o'fallon, il

Senior Full Stack Developer - Front End

Senior Developer (Security) - Hybrid

Sr. Java Programmer

Senior DevOps Software Engineer

Java/J2EE developer Sr.

Sr. Java Developer

Application Development Senior Advisor

Senior Software Engineer

Senior .NET Developer

Sr. Java/Web Developer

Guidewire PolicyCenter Sr Developer

Sr. Developer

Sr Software Engineer

Senior Software Engineer, Core Experiences - St. Louis, MO, USA

Senior Level Software Developer

C# Developer (Jr and Sr Roles)

Senior Software Engineer

Senior Software Engineer, Technology Solutions

Senior Software Engineer

Senior Software Engineer

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