Senior Java & Spring Backend Engineer - Hybrid Denver

Mavensoft Technologies, LLC; Denver, Northern (CO, KY); Hybrid; USD 120,000 - 180,000; Part time

Job summary

Mavensoft Technologies, LLC in Denver seeks an experienced Sr. Java Developer to design, develop, and maintain Java-based applications, REST APIs, and cloud services, with a strong focus on Java 21, Spring Boot, and AWS.

This 7‑month W2 contract is hybrid—onsite Tuesdays, remote otherwise. You will contribute to CI/CD pipelines, Terraform infrastructure, GitLab workflows, and code reviews using IntelliJ IDEA, delivering reliable, well-documented software.

Qualifications

• Strong experience developing Java applications.
• Experience with Java 21 or newer.
• Experience designing, building, and consuming REST APIs.

Responsibilities

• Design, develop, test, and maintain Java-based applications using Java SDK 21.
• Build and enhance applications with Spring Boot and the Spring Framework.
• Develop and maintain REST APIs and JSON-based integrations.
• 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 architecture 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, and documentation.

Skills

Java development

Spring Boot

REST APIs

AWS

GitLab CI/CD

Terraform

IntelliJ IDEA

AI-assisted tools

Tools

GitLab

IntelliJ IDEA

Job description

Mavensoft Technologies, LLC in Denver seeks an experienced Sr. Java Developer to design, develop, and maintain Java-based applications, REST APIs, and cloud services, with a strong focus on Java 21, Spring Boot, and AWS.

This 7‑month W2 contract is hybrid—onsite Tuesdays, remote otherwise. You will contribute to CI/CD pipelines, Terraform infrastructure, GitLab workflows, and code reviews using IntelliJ IDEA, delivering reliable, well-documented software.