Sr. Java Developer

Mavensoft Technologies.•Denver, CO

3d•Hybrid

About The Position

Our Client is seeking an experienced Java Developer Contractor to support the design, development, and maintenance of web applications, backend services, and cloud-based solutions. The ideal candidate will be comfortable working across the Java/Spring ecosystem, building REST APIs, integrating with AWS services, and contributing to modern CI/CD-driven development workflows. The candidate should be hands-on, pragmatic, able to work independently, and comfortable collaborating with technical and business stakeholders.

Requirements

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 HTML, CSS, and JavaScript.
Experience with Git-based source control, preferably GitLab.
Experience 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.

Nice To Haves

Experience with Thymeleaf.
Hands-on experience with Amazon ECS, API Gateway, and DynamoDB.
Familiarity with Terraform or other infrastructure-as-code tools.
Professional experience using IntelliJ IDEA.
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.

Responsibilities

Design, develop, test, and maintain Java-based applications using Java SDK 21.
Build and enhance applications using Spring Boot and the Spring Framework.
Develop and maintain REST APIs and JSON-based integrations.
Support web applications using Thymeleaf, HTML, CSS, and JavaScript.
Work with AWS services including ECS, API Gateway, and DynamoDB.
Contribute to source control and development workflows using GitLab.
Build, maintain, and troubleshoot GitLab CI/CD pipelines.
Participate in application architecture, implementation decisions, code reviews, and deployment practices.
Support infrastructure-as-code efforts, particularly using Terraform.
Use IntelliJ IDEA as the primary development environment.
Apply sound software engineering practices including maintainable code, testing, documentation, and operational awareness.
Leverage AI-assisted coding tools where appropriate to improve productivity and code quality.