Java developer Jobs in Denver, CO

Description:

***Local Candidates
***Hybrid

We are seeking an experienced Java Developer 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.

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. The contractor will work with our development team to deliver application enhancements, new features, integrations, and platform improvements.

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.

Qualifications
• 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 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.
• 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:
• 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

Required / Desired Skills

• Java / Java 21 / Java SDK (Required 5 Years)
  
• Spring Boot (Required 5 Years)
  
• REST APIs (Required 5 Years)
  
• JSON and API Integration patterns (Required 5 Years)
  
• HTML, CSS and JavaScript (Required 5 Years)
  
• Gitlab / Gitlab CI/CD (Required 5 Years)
  
• Amazon Web Services (AWS) (Required 3 Years)
  
• Thymeleaf (Required 1 Years)
  
• AWS Services (ECS, API Gateway, DynamoDB) (Required 3 Years)
  
• Terraform (Required 2 Years)
  
• IntelliJ IDEA (Required 2 Years)
  
• AI-assisted development tools such as Claude Code, GitHub Copilot, Cursor, or similar tools. (Required 1 Years)