Sr. Java Developer

Title: Sr. Java Developer | Location: Denver, CO/ Hybrid | Duration: 12+ Months Job Description 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 Java21 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. 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 SDK21 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 #J-18808-Ljbffr Creative Solutions Services, LLC