ECS GitLab Developer

COOLSOFT; Denver (CO); Hybrid; USD 90,000 - 130,000; Part time

Job summary

COOLSOFT is seeking an experienced ECS GitLab Developer in Denver, CO to design, build, and maintain Java-based web applications and RESTful services. You will work across the Java Spring ecosystem, integrate AWS services, and contribute to CI/CD workflows using GitLab.

The role requires hands-on development, independent work, and collaboration with technical and business stakeholders in a hybrid onsite/remote setup.

Qualifications

• Strong experience building Java web apps with Spring Boot.
• Proficient in REST API design and JSON.
• Familiar with front-end basics: HTML, CSS, JS.
• Experience with GitLab-based CI/CD workflows.

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 on architecture, implementation decisions, reviews, and deployment practices.
• Support infrastructure-as-code efforts, especially Terraform.
• Use IntelliJ IDEA as primary development environment.
• Apply sound software engineering practices, including testing and documentation.

Skills

Spring Boot

REST APIs

HTML And CSS

ECS GitLab

Tools

GitLab

Terraform

IntelliJ IDEA

AWS

Job description

ECS GitLab Developer

(Jobs in Denver, CO)

Requirement id 159161

Job title Developer

Job location in Denver, CO

Skills required Spring Boot, REST APIs, HTML And CSS, ECS GitLab

Open Date 21-Sep-2026

Close Date

Job type Contract

Duration 7 Months

Compensation DOE

Status requirement —

Job interview type —

Job Description Developer: Spring Boot, REST APIs, HTML And CSS, ECS GitLab

Start date :12/1/2026

End Date :06/30/2027

Submission deadline :12/31/2026

Client Info : CO Judicial

Note

• Candidate Must Be Local
• Hybrid, 1 day On-site on Tuesdays. Remote work rest of days.

Description:

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

• 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 Thyme leaf, 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
• 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

• Our current technology stack includes:
• 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
• Inte

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