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Freelance Java Spring 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 ... Java (Spring Boot or similar frameworks) and .NET (Core or Framework). * SQL and relational ...

Purple Drive Technologies

Java Architect

Chicago, IL · On-site

$65 - $87.50/hr

Develop and optimize backend services using Core Java, Spring Boot, and Microservices architecture ... Conduct performance tuning, load testing, and capacity planning. 6. DevOps & Deployment * Implement ...

Staffingine LLC

Java Developer

Chicago, IL · On-site

$52.50 - $68/hr

Java Developer Job Location: Chicago, IL Job Type: Contract * Lead design development and ... Extensive experience with Spring Framework Spring Boot Spring MVC and microservices architecture

Informatic Technologies

Java Developer

Chicago, IL

$52.50 - $68/hr

Experience with Java/J2EE technologies, including the Java programming language, the Java Virtual ... Experience using the Spring Framework for development * Experience with online technologies ...

TechnoConsulting

Java Developer

Chicago, IL

$52.50 - $68/hr

Java 8, Spring, Spring Boot, Oracle/PL/SQL and TDD Additional Information All your information will be kept confidential according to EEO guidelines.

Seven Seven Software

Java Developer

Chicago, IL · On-site

$52.50 - $68/hr

* Strong experience in Core Java (Java 11+), Functional Programming, Spring, ORM (JPA/Hibernate), Unit Testing & Integration Testing * Proficient in RDBMS (Oracle), SQL, and Unix Scripts * Experience ...

TechnoConsulting

Java Developer

Chicago, IL · On-site

$52.50 - $68/hr

Java 8, Spring, Spring Boot, Oracle/PL/SQL and TDD Qualifications Additional Information All your information will be kept confidential according to EEO guidelines.

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Freelance Java Spring Developer information

What are the key skills and qualifications needed to thrive as a Freelance Java Spring Developer, and why are they important?

To thrive as a Freelance Java Spring Developer, you need a solid understanding of Java programming, Spring Framework (including Spring Boot), and experience with RESTful APIs, typically supported by a degree in computer science or relevant certifications. Familiarity with tools like Maven, Git, Docker, and cloud platforms such as AWS or Azure is often required. Strong problem-solving, time management, and client communication skills help you stand out in this role. These competencies ensure you can deliver robust solutions efficiently while managing multiple clients and projects in a dynamic freelance environment.

What are the most common challenges faced by Freelance Java Spring Developers when working with multiple clients simultaneously?

Freelance Java Spring Developers often juggle projects for multiple clients, which can pose challenges such as managing shifting priorities, aligning with different coding standards, and keeping up with varied communication styles. Successfully navigating these requires strong organizational skills, clear project documentation, and proactive communication to set expectations. Additionally, freelancers must stay updated with the latest Spring framework updates to deliver high-quality, maintainable solutions across diverse client environments.

What is a Freelance Java Spring Developer?

A Freelance Java Spring Developer is a self-employed software professional who specializes in building, maintaining, and optimizing applications using the Java programming language and the Spring framework. These developers work on a contract or project basis for various clients, rather than as full-time employees for a single company. Their responsibilities often include designing backend systems, integrating APIs, and ensuring applications are scalable and secure. Freelance Java Spring Developers typically manage their own schedules and may work remotely for clients around the world.

What is the difference between Freelance Java Spring Developer vs Java Backend Developer?

AspectFreelance Java Spring DeveloperJava Backend Developer
CredentialsOften requires Java certifications, Spring certifications, and relevant experienceTypically requires a Java degree or equivalent experience, with or without certifications
Work EnvironmentIndependent, project-based, remote or on-site freelance workFull-time employment in a company or organization, often in an office setting
Employer & Industry UsageClients across various industries hiring for specific projectsEmployers in tech, finance, e-commerce, and other sectors with ongoing backend needs
Search & Comparison IntentLooking for freelance opportunities or contract work in Java Spring developmentSeeking full-time or permanent backend development roles in Java

In summary, Freelance Java Spring Developers typically work independently on short-term projects, requiring specific certifications and flexible work environments. Java Backend Developers usually hold full-time roles within organizations, focusing on ongoing backend system development.

What are the most commonly searched types of Java Spring Developer jobs in Illinois? The most popular types of Java Spring Developer jobs in Illinois are:
What are popular job titles related to Freelance Java Spring Developer jobs in Illinois? For Freelance Java Spring Developer jobs in Illinois, the most frequently searched job titles are:
What job categories do people searching Freelance Java Spring Developer jobs in Illinois look for? The top searched job categories for Freelance Java Spring Developer jobs in Illinois are:
What cities in Illinois are hiring for Freelance Java Spring Developer jobs? Cities in Illinois with the most Freelance Java Spring Developer job openings:
Freelance Java Spring 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 25 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 features using Java and .NET in AWS GovCloud.
  • Lead the development of RESTful services, API endpoints, and backend integration patterns.
  • Architect and implement microservices, serverless functions, and containerized workloads using AWS services such as Lambda, ECS, EKS, Fargate, and API Gateway.
  • Build and optimize data models, SQL queries, and relational database operations.
  • Participate in architecture reviews, design sessions, and backlog refinement.
  • Conduct code reviews and refactor existing backend components for scalability, maintainability, and security.
  • Integrate backend services into CI/CD pipelines with automated builds, tests, and scans.
  • Ensure secure coding practices and interpret output from static and dynamic security analysis tools.
  • Use scripting languages, including Python and Bash, to automate operational and deployment tasks.
  • Troubleshoot complex backend issues across application logic, integrations, data stores, and cloud resources.
  • Mentor team members in API design, backend architecture, and secure coding patterns.

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

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

Requirements
  • Minimum Experience: 3+ years of professional development, including at least 3 years of Java development.
  • Experience owning backend services or components in production.
  • 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

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