Java Developer

nLeague; Colorado Springs (CO); Hybrid; USD 80,000 - 120,000; Full time

Job summary

nLeague is seeking a Java Developer Contractor to support the design, development, and maintenance of web applications and cloud-based solutions. This role involves working with Java/Spring, building REST APIs, and contributing to CI/CD-driven workflows.

The ideal candidate should have strong Java skills, hands-on experience with AWS services, and the ability to work independently while collaborating with stakeholders.

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.

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.
• Work with AWS-based infrastructure and services, including ECS, API Gateway, and DynamoDB.

Skills

Java development

Spring Boot

REST APIs

CI/CD workflows

AWS services

GitLab

Frontend technologies (HTML, CSS, JavaScript)

Tools

GitLab CI/CD

Terraform

IntelliJ IDEA

Job description

Job ID: SB26-149-DEV

Title: Java Developer Contractor

Location: 1300 Broadway, Suite 1100, Denver, Colorado 80203

Duration: 12+ Months

Client: CO Judicial Hybrid

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.

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.

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, and 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 SDK 21
• 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
• AI‑assisted coding tools, including exploration of Claude Code