Sr Java Backend Developer

Job Description

Job Description

Job Title: Java Backend Engineer
Location: Vienna, VA ONSITE INTERVIEW REQUIRED
Type: Contract, long term expected
Compensation: W-2 negotiable
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.
• 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.

\nCompany Description

System One is a leading provider of specialized, highly technical services and solutions to critical infrastructure, technology, life sciences, and government sectors. We partner with large private and public organizations who trust us to execute their complex, mission-critical initiatives through our outsourced services and workforce solutions.

Company Description

System One is a leading provider of specialized, highly technical services and solutions to critical infrastructure, technology, life sciences, and government sectors. We partner with large private and public organizations who trust us to execute their complex, mission-critical initiatives through our outsourced services and workforce solutions.