Java Developer

Job Description

Job Description

MUST LIVE IN COLORADO ( Onsite every Tuesday at the Ralph Carr Judicial Complex, 1300 Broadway, Denver)

Hybrid Remote / W2 / C2C / 1099

Please note we are unable to provide H1B visa sponsorship.

About the Role

We are seeking an experienced  Java Developer Contractor to support the design, development, and maintenance of web applications, backend services, and cloud-based solutions. This role is ideal for someone who is comfortable working across the Java/Spring ecosystem, building REST APIs, integrating with AWS services, and contributing to modern CI/CD-driven development workflows.

The right candidate will be hands-on, pragmatic, and comfortable working independently while collaborating with technical and business stakeholders.

Responsibilities

• Design, develop, test, and maintain Java-based applications using  Java SDK 21 .
• Build and enhance applications using  Spring Boot and the broader  Spring Framework .
• Develop and maintain  REST APIs and JSON-based integrations.
• Support smaller web applications using  Thymeleaf , HTML, CSS, and JavaScript.
• Work with AWS-based infrastructure and services, including  ECS ,  API Gateway , and  DynamoDB .
• Contribute to source control and development workflows using  GitLab .
• Build, maintain, and troubleshoot  GitLab CI/CD pipelines .
• Collaborate with team members on application architecture, implementation decisions, code reviews, and deployment practices.
• Support infrastructure-as-code efforts, especially where  Terraform is used.
• Use  IntelliJ IDEA as the primary development environment.
• Apply sound software engineering practices, including maintainable code design, testing, documentation, and operational awareness.
• Where appropriate, leverage AI-assisted coding tools to improve development productivity and code quality.

Required Qualifications

• Strong professional experience developing applications with  Java .
• Experience with  Java 21or recent versions of the Java SDK.
• Solid experience with  Spring Boot and Spring-based application development.
• Experience designing, building, and consuming  REST APIs .
• Strong working knowledge of  JSON and API integration patterns.
• Familiarity with front-end technologies including  HTML, CSS, and JavaScript .
• Experience using Git-based source control, preferably  GitLab .
• Experience working with CI/CD pipelines, preferably  GitLab CI/CD .
• Practical experience developing, deploying, or supporting applications in  AWS .
• Ability to work independently, communicate clearly, and deliver high-quality work in a contractor capacity.

Preferred Qualifications

• Experience with  Thymeleaf for server-side templating.
• Hands-on experience with AWS services such as:
• • Amazon ECS
  • Amazon API Gateway
  • Amazon DynamoDB
• Familiarity with  Terraform or other infrastructure-as-code tools.
• Experience using  IntelliJ IDEA in a professional development environment.
• Familiarity with AI-assisted development tools such as  Claude Code , GitHub Copilot, Cursor, or similar tools.
• Experience troubleshooting cloud deployments, application logs, build pipelines, and environment-related issues.
• Understanding of secure coding practices and cloud application security concepts.

Technical Environment

Our current technology stack includes:

• Java SDK 21
• Spring Boot / Spring Framework
• Thymeleaf
• REST APIs
• JSON
• HTML / CSS / JavaScript
• AWS, including ECS, API Gateway, and DynamoDB
• GitLab repositories
• GitLab CI/CD pipelines
• Terraform
• IntelliJ IDEA
• AI-assisted coding tools, including exploration of Claude Code

Ideal Candidate

The ideal candidate is a strong Java developer who can move comfortably between backend development, lightweight front-end work, cloud-based deployments, and CI/CD workflows. They should be able to understand existing systems quickly, contribute clean and maintainable code, and work effectively in a modern cloud-oriented development environment.

Experience with AWS, GitLab pipelines, Terraform, and AI-assisted coding tools is highly valued.

Engagement Type

This is a  contractor position . The contractor will work with our development team to deliver application enhancements, new features, integrations, and platform improvements.t, product analyst).

Company Description

Spartan X Corp was founded by a diverse team of military veterans with comprehensive real-world experience. As veterans, honor is the cornerstone of quality that drives our commitment to every mission. As a leading Service-Disabled Veteran-Owned Small Business (SDVOSB) contractor to the U.S. government and her allies, our team will do whatever it takes to ensure our client's success.

​Spartan leverages deep domain expertise and competencies across a wide range of skill sets and technologies to deliver innovative, reliable solutions. This balance of design and performance is guided by proven processes and oversight to ensure safety, security, and measurable results.

​We stand on decades of military service and government contracting experience to execute efficiently and in good faith. We understand the trust placed in us by our customers and the American taxpayer, and we honor that trust by operating with integrity and delivering on every task within the terms and intent of our mission.

Company Description

Spartan X Corp was founded by a diverse team of military veterans with comprehensive real-world experience. As veterans, honor is the cornerstone of quality that drives our commitment to every mission. As a leading Service-Disabled Veteran-Owned Small Business (SDVOSB) contractor to the U.S. government and her allies, our team will do whatever it takes to ensure our client's success.\r\n\r\n​Spartan leverages deep domain expertise and competencies across a wide range of skill sets and technologies to deliver innovative, reliable solutions. This balance of design and performance is guided by proven processes and oversight to ensure safety, security, and measurable results.\r\n\r\n​We stand on decades of military service and government contracting experience to execute efficiently and in good faith. We understand the trust placed in us by our customers and the American taxpayer, and we honor that trust by operating with integrity and delivering on every task within the terms and intent of our mission.