Java Developer

Tech Mirrors; Denver (CO); On-site; USD 80,000 - 120,000; Part time

Job summary

Tech Mirrors is looking for an experienced Java Developer to join its development team on a contract basis in Denver, Colorado. The role requires strong backend development experience with Java and Spring Boot, hands-on familiarity with AWS cloud services, and effective communication skills. The ideal candidate should excel in developing REST APIs and supporting cloud-based applications while contributing to modern DevOps workflows.

Experience in Agile environments and a good understanding of GitLab CI/CD are also preferred. This role is great for those looking to work independently in a dynamic team.

Qualifications

• Strong backend development experience with Java and Spring Boot.
• Hands-on experience with AWS cloud services.
• Familiarity with GitLab CI/CD pipelines.

Responsibilities

• Developing REST APIs and supporting cloud-based applications.
• Contributing to modern DevOps workflows.

Skills

Java

Spring Boot

REST APIs

JSON

AWS

GitLab CI/CD

HTML

CSS

JavaScript

Tools

IntelliJ IDEA

Terraform

Job description

We are looking for an experienced Java Developer to join our development team on a contract basis. The ideal candidate should have strong backend development experience with Java and Spring Boot, hands‑on experience with AWS cloud services, and familiarity with GitLab CI/CD. This role involves developing REST APIs, supporting cloud‑based applications, and contributing to modern DevOps workflows.

Required Skills

• Strong experience with Java (preferably Java 21 or recent versions)
• Hands‑on experience with Spring Boot and Spring Framework
• Experience designing and developing REST APIs
• Strong knowledge of JSON and API integrations
• Basic front‑end skills: HTML, CSS, JavaScript
• Experience with AWS (deployment and application support)
• Experience using Git/GitLab for source control
• Experience with GitLab CI/CD pipelines
• Ability to work independently and communicate effectively

Preferred Skills

• Experience with Thymeleaf
• Hands‑on experience with Amazon ECS
• Hands‑on experience with API Gateway
• Hands‑on experience with DynamoDB
• Experience with Terraform (Infrastructure as Code)
• Experience using IntelliJ IDEA
• Familiarity with AI coding tools such as GitHub Copilot, Cursor, Claude Code, etc.
• Experience troubleshooting cloud deployments, CI/CD pipelines, and production issues
• Understanding of secure coding and cloud security best practices

Technology Stack

• Java SDK 21
• Spring Boot / Spring Framework
• REST APIs, JSON
• HTML, CSS, JavaScript
• Thymeleaf
• AWS (ECS, API Gateway, DynamoDB)
• GitLab & GitLab CI/CD
• Terraform
• IntelliJ IDEA

Ideal Candidate

• Strong backend Java developer with cloud deployment experience
• Comfortable working across backend, lightweight frontend, and DevOps
• Able to quickly understand existing applications and deliver high‑quality, maintainable code
• Experience working in Agile development environments is a plus