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Freelance Java Backend Developer Jobs in Illinois

Netrist Solutions LLC

Java Developer

Scott Air Force Base, IL · On-site

$49.25 - $63.75/hr

We are seeking a Java Developer to support a command and control system for the Mobility Air Force ... This role focuses on designing and maintaining mission critical backend services in Java and .NET, ...

Resource 1

Java Developer

Chicago, IL · Hybrid

$52.50 - $68/hr

Resource 1 is in need of a Java Developer for a long-term contract. This is hybrid/ remote, so ... and back-end (SQL). Individual should have experience with full life-cycle development, from ...

Purple Drive Technologies

Java AWS lead

Chicago, IL · On-site

Java AWS lead Location: Columbus, OH / Chicago, IL (15+ years) Need well experienced person in ... developers." * "Develop and maintain high-quality, scalable, and performant backend services using ...

Apex Informatics

Java Developer

Chicago, IL · Hybrid

$52.50 - $68/hr

Core Java Developer Work Location: Chicago, IL (Hybrid Role) Must have skills: AWS, Microservices ... Identify and address performance bottlenecks in both front-end and back-end components, ensuring ...

Apex Informatics

Java Developer

Chicago, IL · On-site

$52.50 - $68/hr

Core Java Developer Work Location: Chicago, IL (Hybrid Role) Must have skills: AWS, Microservices ... Identify and address performance bottlenecks in both front-end and back-end components, ensuring ...

Leidos

Mid-Level Backend Software Engineer

Madison, IL

$87K - $157K/yr

Design, develop, test, and maintain backend application components using Java or Python * REST API ... Object-Oriented Programming: Apply object-oriented design principles to build scalable and ...

Leidos

Mid-Level Backend Software Engineer

Roxana, IL

$87K - $157K/yr

Design, develop, test, and maintain backend application components using Java or Python * REST API ... Object-Oriented Programming: Apply object-oriented design principles to build scalable and ...

Leidos

Mid-Level Backend Software Engineer

Hartford, IL

$87K - $157K/yr

Design, develop, test, and maintain backend application components using Java or Python * REST API ... Object-Oriented Programming: Apply object-oriented design principles to build scalable and ...

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Freelance Java Backend Developer jobs near you
Java Developer

Java Developer

Netrist Solutions LLC

Scott Air Force Base, IL • On-site

$49.25 - $63.75/hr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Posted 3 days ago

Job description

Job Description
We are seeking a Java Developer to support a command and control system for the Mobility Air Force. This role focuses on designing and maintaining mission critical backend services in Java and .NET, building and securing RESTful APIs, and implementing cloud native patterns in Amazon GovCloud. You will work across the entire stack, but your primary responsibility will be backend architecture, service reliability, data integrity, and integration with cloud services.
You will operate within an Agile environment and mentor junior developers while contributing to evolving DevSecOps pipelines and secure deployment practices.
What you will do
  • Design, implement, test, and deploy backend featuresusing Java and .NET in AWS GovCloud.
  • Lead the development of RESTful services, APIendpoints, and backend integration patterns.
  • Architect and implement microservices, serverlessfunctions, and containerized workloads using AWS services such as Lambda,ECS, EKS, Fargate, and API Gateway.
  • Build and optimize data models, SQL queries, andrelational database operations.
  • Participate in architecture reviews, design sessions,and backlog refinement.
  • Conduct code reviews and refactor existing backendcomponents for scalability, maintainability, and security.
  • Integrate backend services into CI/CD pipelines withautomated builds, tests, and scans.
  • Ensure secure coding practices and interpret outputfrom static and dynamic security analysis tools.
  • Use scripting languages, including Python and Bash, toautomate operational and deployment tasks.
  • Troubleshoot complex backend issues across applicationlogic, integrations, data stores, and cloud resources.
  • Mentor team members in API design, backendarchitecture, and secure coding patterns.

What we like to see
  • Deep experience with Java and .NET development inproduction environments.
  • Strong understanding of REST API design, serviceversioning, and integration testing.
  • Experience deploying and managing backend services inAWS using Lambda, ECS, ECR, CloudFormation, RDS, S3, CloudWatch, and IAM.
  • Experience with microservices or modular servicearchitectures.
  • Strong debugging skills in distributed systems.
  • Experience working within DoD or regulated environmentswith security compliance requirements.
  • Comfortable working with minimal day-to-day directionand accountable for end to end delivery.

You should be familiar with
  • Java (Spring Boot or similar frameworks) and .NET (Coreor Framework).
  • SQL and relational database design.
  • Linux administration and scripting.
  • Containerization with Docker and orchestrationpatterns.
  • CI/CD tooling such as Jenkins, GitHub Actions, orGitLab CI.
  • Cloud networking, IAM policies, and secure clouddeployment models.
  • Basic front end technologies for full stackintegration, including HTML, CSS, and JavaScript.
  • OpenAPI Spec 3.x and automated code generation
  • Agile methodology.

Requirements
  • Minimum Experience: 3+ years of professionaldevelopment, including at least 3 years of Java development.
  • Experience owning backend services or components inproduction.
  • Bachelor's degree in Computer Science, Engineering, orrelated field, or equivalent experience.
  • Ability to obtain or maintain a government securityclearance.
  • 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

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