Senior Java Developer

Apex Systems, a World-Class Technology Solutions Provider, is seeking applicants for the below position on behalf of our client. Please apply if interested and qualified. Please note that only qualified candidates will be contacted. Position: Senior Java Developer Location: Hybrid (Denver) Clearance: None Pay Rate Range: $114,400-132,000 Position Overview: 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. What You'll Do/Required technology and Skills: 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 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 IntelliJ IDEA 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. Background checks: Statewide Criminal Verification Federal Criminal Verification SSN Trace Global Monitor Check Apex Benefits Overview Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a retirement plan (401k or local country equivalent) program. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Apex team member can provide. EEO Employer Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at [email protected] or View phone number on click.appcast.io. Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRateds Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Everforth Apex uses a virtual recruiter as part of the application process. Click here for more details. By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from Everforth Apex and its affiliates, and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy at Everforth Apex Benefits Overview: Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Everforth Apex team member can provide. Everforth Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you require an accommodation under the Americans with Disabilities Act to participate in an interview with a virtual recruiter or to use our website for a search or application, please contact our Benefits Department at [email protected] or View phone number on click.appcast.io. Please note that this contact information is strictly to be used for medical ADA accommodations and that no other inquiries will be answered. UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex Systems. Apex Systems