
Java Developer with AWS - One day per week onsite
Denver, CO · HybridContractSeen 2w agoSeen in employer's feed 3 days ago
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Job overview
MSys Inc. seeks an experienced Java Developer Contractor to design, develop, and maintain web applications, backend services, and cloud‑based solutions, working across the Java/Spring ecosystem, building REST APIs, integrating with AWS services, and contributing to CI/CD‑driven workflows.
Skills & qualifications
Skills
Full job description
Web Cam InterviewEvery tuesday onsite***
About the Role
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
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Design, develop, test, and maintain Java-based applications using Java SDK 21.
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Build and enhance applications using Spring Boot and the broader Spring Framework.
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Develop and maintain REST APIs and JSON-based integrations.
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Support smaller web applications using Thymeleaf, HTML, CSS, and JavaScript.
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Work with AWS-based infrastructure and services, including ECS, API Gateway, and DynamoDB.
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Contribute to source control and development workflows using GitLab.
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Build, maintain, and troubleshoot GitLab CI/CD pipelines.
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Collaborate with team members on application architecture, implementation decisions, code reviews, and deployment practices.
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Support infrastructure-as-code efforts, especially where Terraform is used.
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Use IntelliJ IDEA as the primary development environment.
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Apply sound software engineering practices, including maintainable code design, testing, documentation, and operational awareness.
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Where appropriate, leverage AI-assisted coding tools to improve development productivity and code quality.
Required Qualifications
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Strong professional experience developing applications with Java.
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Experience with Java 21 or recent versions of the Java SDK.
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Solid experience with Spring Boot and Spring-based application development.
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Experience designing, building, and consuming REST APIs.
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Strong working knowledge of JSON and API integration patterns.
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Familiarity with front-end technologies including HTML, CSS, and JavaScript.
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Experience using Git-based source control, preferably GitLab.
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Experience working with CI/CD pipelines, preferably GitLab CI/CD.
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Practical experience developing, deploying, or supporting applications in AWS.
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Ability to work independently, communicate clearly, and deliver high-quality work in a contractor capacity.
Preferred Qualifications
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Experience with Thymeleaf for server-side templating.
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Hands-on experience with AWS services such as:
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Amazon ECS
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Amazon API Gateway
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Amazon DynamoDB
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Familiarity with Terraform or other infrastructure-as-code tools.
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Experience using IntelliJ IDEA in a professional development environment.
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Familiarity with AI-assisted development tools such as Claude Code, GitHub Copilot, Cursor, or similar tools.
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Experience troubleshooting cloud deployments, application logs, build pipelines, and environment-related issues.
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Understanding of secure coding practices and cloud application security concepts.
Technical Environment
Our current technology stack includes:
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Java SDK 21
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Spring Boot / Spring Framework
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Thymeleaf
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REST APIs
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JSON
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HTML / CSS / JavaScript
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AWS, including ECS, API Gateway, and DynamoDB
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GitLab repositories
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GitLab CI/CD pipelines
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Terraform
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IntelliJ IDEA
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AI-assisted coding tools, including exploration of Claude Code
Ideal 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.
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