Top 96 Java Developer Jobs in O Fallon, IL

Lead Software Engineer
Emergent Software —St. Louis, MO
- $140,000 - $160,000 a year
- Full-time
- Remote
- 5 years
- Java
- Mentoring
Quick Apply
Sr. Java Programmer
Rely Systems —Belleville, IL
- Mid-level
- Office
- IT
Mid Software Developer
Chenega Agile Real-Time Solutions —O'Fallon, IL
- $75,000 - $100,000 a year
- Full-time
- Background check
- Microsoft Excel
- Bachelor of Science
Junior Java/Web Developer
Sovereign Technologies —St. Louis, MO
- Oracle
- Computer Science
- Bachelor of Science
Full Stack Developer (Backend Emphasis)
Agile Defense —Scott AFB, IL
- $110,000 - $150,000 a year
- Hybrid work
- Computer Science
- 5 years
- System design
- Paid holidays
- Disability insurance
Quick Apply
Java Angular Full Stack Engineer
Stellar IT Solutions LLC —St. Louis, MO
- $52 - $58 an hour
- Remote
- Java
- AWS
- Mentoring
Quick Apply
Entry-Level Connector Developer
Nomad eCommerce —St. Louis, MO
- Part-time
- Remote
- Azure
- Computer Science
- ERP systems
Quick Apply
9h
Software Application Developer
Boeing —Scott AFB, IL
- $81,000 - $92,000 a year
- Computer science
- Azure
- Computer Science
- Health savings account
- Disability insurance
9d
Software Engineer II - Remote
CSAA Insurance Services, Inc. —St. Louis, MO
- $41.07 - $54.76 an hour
- Full-time
- Remote
- Computer science
- Computer Science
- Mid-level
- 401(k) matching
1d
Sr. Java Developer
Sovereign Technologies —St. Louis, MO
- 5 years
- Bachelor's degree
- Training & development
Java Developer- Direct Hire- 150213
Sovereign Technologies —St. Louis, MO
- Mid-level
- Java
- Python
Java/J2EE developer Sr.
kollasoft —St. Louis, MO
- Contract
- Oracle
- Mentoring
- Senior level
Quick Apply
Senior DevOps Software Engineer
Global Enterprise Services, LLC —Swansea, IL
- System design
- 8 years
- SQL
Quick Apply
Sr. Java/Web Developer
Sovereign Technologies —St. Louis, MO
- Computer Science
- Bachelor of Science
- SQL
Software Engineer
Reinventing Geospatial, Inc. (RGi) —St. Louis, MO
- $115,000 - $170,000 a year
- Full-time
- Computer science
- Computer Science
- 5 years
- Paid parental leave
- Health insurance
Quick Apply
C++ Software Engineer
LSEG (London Stock Exchange Group) —St. Louis, MO
- $95,700 - $159,700 a year
- Full-time
- Azure
- Mid-level
- 3 years
- Commuter assistance
- Health insurance
Full Stack Developer (Frontend Emphasis)
Agile Defense —Scott AFB, IL
- $110,000 - $150,000 a year
- Hybrid work
- Computer Science
- System design
- Java
- Paid holidays
- Disability insurance
Quick Apply
Software Engineer
Sovereign Technologies —St. Louis, MO
- Computer Science
- Mid-level
- IT
Lead Java/Microservices Developer
Sovereign Technologies —St. Louis, MO
- Email
- Computer Science
- Mentoring
- Senior level
Data Engineer Software Developer
Isys Technologies —Scott AFB, IL
- $99,399 - $105,612 a year
- Full-time
- Azure
- Computer Science
- Mid-level

I want to receive the latest job alert for Java Developer in O Fallon, IL

By signing in to your account, you agree to SimplyHired's Terms of Service and consent to our Cookie and Privacy Policy.

Explore jobs in more locations

Java Developer jobs near O Fallon, IL

Lead Software Engineer

Emergent Software -
St. Louis, MO

Quick Apply

Job Details

Full-time
$140,000 - $160,000 a year

Qualifications

Performance monitoring
Authentication
Secure web application development
Software engineering
Incident management
Improving system uptime or availability
Managing IT teams
Team development
Technology management experience
Incident management operations support
Mentoring
Systems engineering
Software documentation
Production monitoring
Developing and maintaining backend systems
Monitoring system implementation
Web applications
Cloud monitoring
Managing software development teams
Web services design

Full Job Description

**This position is a direct hire for one of our clients. This is a remote position. Eligible candidates must currently reside in the US and authorized to work in the US without visa sponsorship.**

Our client is seeking a highly skilled and hands-on Lead Software Engineer to play a pivotal role in building and scaling a new API platform that will support strategic integrations with external SaaS partners. This is a unique opportunity to help define the technical vision, lead platform development efforts, and build a high-impact engineering function from the ground up. The role combines technical leadership, software architecture, and cross-functional collaboration in a highly visible initiative that will directly support business growth.

Primary Duties

Lead the design, development, and evolution of a partner-facing API platform.
Architect and maintain a well-versioned, secure, and developer-friendly public API surface with a focus on backward compatibility, authentication, rate limiting, and documentation.
Define and implement API architecture, standards, and best practices.
Provide hands-on technical leadership through architecture guidance, code reviews, mentoring, and engineering best practices.
Own the long-term technical strategy and roadmap for the platform.
Collaborate closely with product managers, project managers, and engineering teams across multiple platforms.
Lead and coordinate the work of distributed engineering resources, including international contractors.
Own production systems for partner APIs, including monitoring, observability, incident response, alerting, performance optimization, reliability, and operational readiness.
Drive integration efforts with external SaaS platforms and partners.
Help establish engineering processes, technical direction, and team standards as the platform grows.
Break down complex initiatives into actionable workstreams and translate business requirements and acceptance criteria into technical deliverables.
Develop project plans, coordinate resources, and drive timely delivery of key initiatives.
Contribute to architecture and technical decision-making across services and platforms developed in multiple programming languages.
Serve as both a technical leader and hands-on contributor during the initial build phase.

Qualifications

5+ years of experience developing web-based software applications, including experience leading or mentoring engineers.
Deep experience designing, securing, documenting, and operating REST APIs, including authentication, versioning, and lifecycle management.
Strong experience managing and supporting production systems.
Hands-on experience with AWS services, particularly API Gateway, ECS, and related cloud-native technologies.
Strong TypeScript development experience.
Demonstrated technical leadership and project coordination experience.
Ability to quickly become productive in unfamiliar codebases and technology stacks.

Experience managing live customer-facing systems, including monitoring, observability, incident response, and reliability engineering.
Strong communication skills and the ability to thrive in a fast-paced, evolving environment.

Nice to Have Skills

Experience working across multiple backend languages such as C#, Java, Go, Python, Ruby, Node.js, or TypeScript.
Experience designing and delivering public, partner-facing, or developer-focused APIs and supporting developer documentation.
Experience with Infrastructure as Code tools such as Terraform, CloudFormation, or AWS CDK.
Experience working within Agile, Scrum, or Kanban environments.
Experience with test automation, contract testing, and test-driven development.
SaaS platform experience.
Familiarity with web application security and API security best practices.
Experience leading distributed or global engineering teams.

Our Vetting Process

At Emergent Staffing, we work hard to find the best people capable of delivering high quality services to our clients. If you think you’re one of those, please understand that the effort put into this by people like yourself helps us be successful in surrounding you with other top-notch people. Here are the steps of our vetting process for this position:

Application (5 minutes)
Online Assessment (40-60 minutes)
Initial Video Interview (45 minutes)
Hiring Manager Phone Interview (30 minutes)
Hiring Manager Video Interview (60 minutes)
Hiring Team Interview
Job Offer!

Eligible candidates must reside in one of the following states: Alabama, Arizona, Arkansas, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Maine, Michigan, Minnesota, Missouri, New Hampshire, New Mexico, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, or Wisconsin

#EmergentStaffing

#IND55

Quick Apply

Refine Your Search

Java Developer jobs in O Fallon, IL

Lead Software Engineer

Sr. Java Programmer

Mid Software Developer

Junior Java/Web Developer

Full Stack Developer (Backend Emphasis)

Java Angular Full Stack Engineer

Entry-Level Connector Developer

Software Application Developer

Software Engineer II - Remote

Sr. Java Developer

Java Developer- Direct Hire- 150213

Java/J2EE developer Sr.

Senior DevOps Software Engineer

Sr. Java/Web Developer

Software Engineer

C++ Software Engineer

Full Stack Developer (Frontend Emphasis)

Software Engineer

Lead Java/Microservices Developer

Data Engineer Software Developer

I want to receive the latest job alert for Java Developer in O Fallon, IL

Related Searches

Explore jobs in more locations

Primary Duties

Qualifications

Nice to Have Skills

Our Vetting Process

Job Seeker Tools

Employer Tools

Browse

Stay Connected