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Denver, CO
Posted · 28.09.2026
LinkedIn Jobs US

# Senior Java Developer

Haystack

We are working with a leading technology consulting firm that partners with diverse industries to deliver innovative software solutions and drive digital transformation. The Role Design, develop, test, and maintain Java-based applications using Java SDK 21 and Spring Boot. Build and enhance applications, including developing and maintaining REST APIs and JSON-based integrations. Support smaller web applications using front-end technologies like Thymeleaf, HTML, CSS, and JavaScript. Work with AWS-based infrastructure and services (ECS, API Gateway, DynamoDB) and contribute to infrastructure-as-code efforts with Terraform. Contribute to source control and development workflows using GitLab, including building and troubleshooting GitLab CI/CD pipelines. Collaborate with team members on application architecture, code reviews, and deployment practices, applying sound software engineering principles. What You'll Need Strong professional experience developing applications with Java, specifically Java 21 or recent SDK versions. Solid experience with Spring Boot and Spring-based application development. Proven ability to design, build, and consume REST APIs with strong working knowledge of JSON and API integration patterns. Familiarity with front-end technologies such as HTML, CSS, and JavaScript. Experience with Git-based source control (preferably GitLab) and CI/CD pipelines. Practical experience developing, deploying, or supporting applications in AWS. Ability to work independently, be hands-on, pragmatic, and collaborate effectively with technical and business stakeholders. What's On Offer Opportunity to work with modern technologies including Java 21, Spring Boot, AWS, Terraform, and GitLab CI/CD. A collaborative environment focused on sound software engineering practices and continuous improvement. The chance to contribute to significant projects for various clients in a hybrid work setting. Apply via Haystack today!

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