Java Developer

Java DeveloperLocation: Denver, Colorado 80203On-site/Remote/Hybrid: HybridDuration: 12 MonthsThis is a contractor position. The contractor will work with our development team to deliver application enhancements, new features, integrations, and platform improvements. Candidate Must Be Local. Additional Location Details (City, State): Ideal candidate will be able to be in-person on Tuesdays while the rest of the days will be remote. Office is located at 1300 Broadway, Denver, CO.Job DescriptionJava Developer Contractor **We cannot sponsor H1B applications. Applicant must be authorized to work in the USA presently and in the future**About the RoleWe 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.ResponsibilitiesDesign, 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 QualificationsStrong 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.Preferred QualificationsExperience with Thymeleaf for server-side templating.Hands-on experience with AWS services such as: Amazon ECSAmazon API GatewayAmazon DynamoDBFamiliarity 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 21Spring Boot / Spring FrameworkThymeleafREST APIsJSONHTML / CSS / JavaScriptAWS, including ECS, API Gateway, and DynamoDBGitLab repositoriesGitLab CI/CD pipelinesTerraformIntelliJ IDEAAI-assisted coding tools, including exploration of Claude CodeIdeal 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.About Us: InterSources IncInterSources Inc is a Small, Woman, and Minority-Owned Business Enterprise, ISO/IEC 27001, SOC 2 Type 2 certified company with massive 18+ years of diversified experience in providing IT Consulting Services, Artificial Intelligence, Data Analysis, Application Development, Cloud Services, Cybersecurity, Digital Marketing, ERP Management, Custom Software Development, Web Development, UI/UX Design, System Integration, QA Support etc. We make reasonable accommodations for clients and employees, and we do not discriminate based on any protected attribute including race, religion, color, national origin, gender sexual orientation, gender identity, age, or marital status. We also are a Google Cloud and Oracle partner company.