Java SDK JSON GitLab AWS Developer (Jobs in Denver, CO)   Requirement id 158463 Job title Developer Job location in Denver, CO Skills required Java, SDK, REST APIs, JSON GitLab AWS Open Date 15-Jun-2026 Close Date Job type Contract Duration 12 Months Compensation DOE Status requirement --- Job interview type --- Apply    Email Recruiter: coolsoft Job Description Developer: Java, SDK, REST APIs, JSON GitLab AWS Start date :7/27/2026 End Date :07/27/2027 Submission deadline :07/03/2026 Client Info : CO Judicial Note: * Candidate Must Be Local * Position Location: Hybrid * 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. Description: 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 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 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 Dy   Call 502-379-4456 Ext 100 for more details. Please provide Requirement id: 158463 while calling.   Other jobs in CO: Denver (5), Fort Collins (1), Java job openings in Denver, CO Jobs List Jr. Java Developer Create date: 06-Nov-2019 Responsibilities Job Title: Java Developer Location: Denver, CO Duration: 5 Months Summary/Responsibilities: Researches, collects, and reports information on the ability and capacity of company products and competing equipment. Aids in the design and development of equipment and systems, and redesign of existing sys.... 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