Sr. Java Developer

Title: Sr. Java Developer
Location: Denver CO Hybrid MST (Candidate Must Be Local )
Hybrid 1 day On-site on Tuesdays. Remote work rest of days
Duration: 7 Months W2 Contract

Our Client is seeking an experienced Java Developer Contractor to support the design development and maintenance of web applications backend services and cloud-based solutions.

The ideal candidate will be comfortable working across the Java/Spring ecosystem building REST APIs integrating with AWS services and contributing to modern CI/CD-driven development workflows. The candidate should be hands-on pragmatic able to work independently and comfortable collaborating with technical and business stakeholders.

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

• Strong professional experience developing applications with Java.
• Experience with Java 21 or 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 HTML CSS and JavaScript.
• Experience with Git-based source control preferably GitLab.
• Experience 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.

• Experience with Thymeleaf.
• Hands-on experience with Amazon ECS API Gateway and DynamoDB.
• Familiarity with Terraform or other infrastructure-as-code tools.
• Professional experience using IntelliJ IDEA.
• 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.