Java Backend Engineer - Onsite Interview required

System One; Town of Vienna (WI); Hybrid; USD 83,000 - 138,000; Full time

Job summary

System One in Vienna, VA seeks a Java Backend Engineer for a contract, long-term engagement. The role is hybrid: 3 days onsite, 2 days remote, 40 hours weekly, onsite interview required.

You will design, build, and maintain secure backend services and APIs, focusing on performance, reliability, and observability, working with Spring, REST, and cloud-native patterns on Azure.

Qualifications

• Proficiency in Java 17+ and enterprise Java development.
• Experience with Spring, Spring Boot, web services, and RESTful APIs.
• Experience with automated testing (JUnit, Mockito) and CI/CD tools (Maven, Docker, Jenkins, GitHub, Azure DevOps).
• SQL and data integration; designing distributed, scalable microservices in cloud-native environments.

Responsibilities

• Design, build, integrate, and maintain secure backend services and APIs supporting mobile, web, enterprise, and partner systems.
• Design for performance, reliability, resiliency, observability, quality, and responsiveness.
• Collaborate with cross-functional teams to deliver sustainable technical solutions.
• Develop and maintain unit, integration, and automated tests to support reliable delivery.
• Apply secure coding, data protection, and engineering standards.
• Troubleshoot production defects, performance bottlenecks, and complex service dependencies.
• Refactor code and conduct peer reviews to improve security, quality, readability, and maintainability.
• Provide documentation and contribute to proofs-of-concept for architectural decisions.
• Support services across testing, deployment, production troubleshooting, and continuous improvement.
• Participate in Agile ceremonies and advocate for adaptive planning and reusable solutions.

Skills

Java

Spring

REST APIs

Testing frameworks

CI/CD

Cloud concepts

Tools

Git

Maven

Docker

Jenkins

GitHub

Azure DevOps

Job description

Job Title: Java Backend Engineer
Location: Vienna, VA ONSITE INTERVIEW REQUIRED
Type: Contract, long term expected
Compensation:W-2 or C2C, H1B ok, no OPT
Work Model: Hybrid -- 3 days onsite and 2 days remote
Hours: 40 hours a week

Responsibilities

• Design, build, integrate, and maintain secure backend services and APIs supporting mobile, web, enterprise, and partner systems.
• Design for performance, reliability, resiliency, observability, quality, and responsiveness.
• Collaborate with cross-functional teams to define, design, and deliver sustainable technical solutions.
• Develop and maintain unit, integration, and automated tests to support reliable delivery.
• Apply secure coding, data protection, and engineering standards.
• Troubleshoot production defects, performance bottlenecks, integration issues, and complex service dependencies.
• Refactor code and conduct peer reviews to improve security, quality, readability, and maintainability.
• Contribute to solution design, technical documentation, and proof-of-concepts that support architectural decisions.
• Support services across testing, deployment, production troubleshooting, and continuous operational improvement.
• Participate in Agile ceremonies and advocate for adaptive planning, automation, reusable solutions, and continuous improvement.
• Share knowledge and support the development of less experienced engineers.

Requirements

• Strong Java experience, with Java 17 or newer preferred.
• Solid knowledge of enterprise Java, Spring, Spring Boot, web services, and RESTful APIs.
• Experience with automated testing frameworks and practices, such as JUnit and Mockito.
• Proficiency with Git and CI/CD tools such as Maven, Docker, Jenkins, GitHub, or Azure DevOps.
• Strong understanding of databases, SQL, and data integration patterns.
• Experience troubleshooting distributed systems and designing scalable, resilient, observable microservices.
• Experience developing cloud-native applications, with Microsoft Azure strongly preferred.
• Effective communication, independent prioritization, and collaboration skills, including the ability to explain technical concepts to non-technical audiences.

System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.

System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.

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