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60 System One Senior Software Engineer Jobs Hiring in VA

System One

Software Development Engineer (SDET)

Merrifield, VA · On-site

$49.75 - $64.25/hr

Senior Software Development Engineer (SDET) Location: Hybrid Work Model Reporting to Vienna, VA ... System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering ...

System One

Software Development Engineer (SDET)

Merrifield, VA · On-site

$49.75 - $64.25/hr

Senior Software Development Engineer (SDET) Location: Hybrid Work Model Reporting to Vienna, VA ... System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering ...

System One

Software Development Engineer (SDET)

Merrifield, VA · On-site

$49.75 - $64.25/hr

Senior Software Development Engineer (SDET) Location: Hybrid Work Model Reporting to Vienna, VA ... System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering ...

System One

Sr SDET

Reston, VA · On-site

$115K - $149K/yr

Senior SDET (Automation Testing) | Hybrid | Reston, VA We are seeking a Senior Software Development ... Exposure to multiple operating systems and technologies including Windows, Linux, UNIX, .NET, and ...

System One

Sr SDET

Reston, VA · On-site

$116K - $151K/yr

Senior SDET (Automation Testing) | Hybrid | Reston, VA We are seeking a Senior Software Development ... Exposure to multiple operating systems and technologies including Windows, Linux, UNIX, .NET, and ...

System One

Senior Network Engineer CCNP

Alexandria, VA · On-site

$180K/yr

Apply current and emerging network software, hardware technology, and protocols to develop ... Security + (Preferred) System One, and its subsidiaries, including Joulé and Mountain Ltd., are ...

System One

Senior Network Engineer CCNP

Alexandria, VA · On-site

$180K/yr

Apply current and emerging network software, hardware technology, and protocols to develop ... Security + (Preferred) System One, and its subsidiaries, including Joulé and Mountain Ltd., are ...

System One

Senior Network Engineer CCNP

Alexandria, VA · On-site

$180K/yr

Apply current and emerging network software, hardware technology, and protocols to develop ... Security + (Preferred) System One, and its subsidiaries, including Joulé and Mountain Ltd., are ...

System One

Senior Network Engineer CCNP

Alexandria, VA · On-site

$180K/yr

Apply current and emerging network software, hardware technology, and protocols to develop ... Security + (Preferred) System One, and its subsidiaries, including Joulé and Mountain Ltd., are ...

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System One Jobs Information

What is it like to work at System One?

System One is a professional services company that values collaboration, innovation, and a client-centric approach, fostering a dynamic and supportive work environment.

The company's team structure is designed to facilitate knowledge sharing and expertise exchange, with a flat organizational hierarchy that encourages open communication and cross-functional collaboration. System One's mission is to deliver high-quality solutions to its clients through a network of experienced professionals and cutting-edge technologies.

Working at System One may appeal to candidates who are looking for a challenging and rewarding career in a fast-paced, client-driven industry, with opportunities for professional growth and development in a collaborative and dynamic work environment.

What makes System One an attractive place to work?

System One is a leading provider of workforce solutions and staffing services, known for its expertise in delivering high-quality talent to various industries. The company's workplace is characterized by a culture of innovation, collaboration, and flexibility, offering employees opportunities to work on diverse projects and develop their skills in a dynamic environment. By joining System One, professionals can expect to contribute to the growth and success of a forward-thinking organization, with opportunities for career advancement and professional development in a rapidly evolving industry.

What are the most popular jobs at System One in Virginia?

What are the most popular states for System One Senior Software Engineer Jobs?

Infographic showing various Senior Software Engineer job openings at System One in Virginia as of August 2026, with employment types broken down into 37% Full Time, 1% Part Time, and 62% Contract. Highlights an 98% Physical, and 2% Remote job distribution.

Sr Software Engineer - Java & APIs (Night Shift)

System One

Reston, VA • On-site

$79/hr

Other

Medical, Dental, Vision, Life, Retirement

Re-posted yesterday

Job description

Job Title: Java Developer - Night Shift
Location: Reston, VA
Type: Contract to Hire 
Compensation: $79/HR
Work Model: Hybrid – onsite and remote
 

Overview

Important Requirements (Please Read Before Applying)
  • Night shift role (final schedule assigned after onboarding)
  • Rotating weekend coverage required
  • Onsite interview required
  • 2 to 3 weeks onsite training required

This is a hands on engineering plus production support role supporting high visibility, mission critical systems.

About the Role

We are looking for a Senior Software Engineer with strong Java, API, and production support experience to build, maintain, and support enterprise scale applications used by tens of thousands of users.

This role is ideal for engineers who:

  • Thrive in high impact, fast response environments
  • Enjoy solving complex production issues
  • Can balance development plus operational support
  • Are comfortable working independently during overnight hours
What You Will Do
  • Design, build, and enhance enterprise Java applications and APIs
  • Troubleshoot and resolve critical production issues in real time
  • Develop and execute unit tests and automated test cases
  • Support and improve system performance, reliability, and scalability
  • Work across teams to deliver high availability systems at scale
  • Contribute to architecture decisions and system design
  • Maintain and improve CI CD pipelines, code quality, and deployment processes
  • Mentor junior engineers and contribute to team best practices
What You Bring (Required)
  • 5 or more years of software engineering experience
  • Strong Java development experience (Java JEE, Spring ecosystem)
  • Experience building and supporting REST APIs or web services
  • Production support experience (this is critical)
  • Experience with:
    • Spring Boot, MVC, Integration
    • Hibernate or similar ORM frameworks
    • SQL and database design
    • CI CD tools (Jenkins, Maven, etc.)
  • Front end basics: HTML, JavaScript, CSS
  • Strong troubleshooting and problem solving skills
  • Ability to work independently during overnight shifts
Nice to Have
  • API Management (APIM) experience
  • Experience with Angular or React
  • Knowledge of OAuth2, SSO, or security frameworks
  • Experience with cloud platforms (AWS or Azure)
  • Exposure to Big Data technologies
What Sets You Apart
  • You write clean, efficient, production ready code
  • You stay calm under pressure and can resolve critical issues quickly
  • You are comfortable owning systems end to end
  • You proactively identify improvements and drive them forward
Reality of the Role (No Surprises)

This is not a typical 9 to 5 development role.
You will be:

  • Working overnight shifts
  • Supporting live production systems
  • Handling high priority issues in real time

In return, you will have:

  • High ownership and visibility
  • Opportunity to work on large scale, mission critical systems
  • A team that values strong, reliable engineers
  • An opportunity to convert to a full-time employee of the client, based on eligibility and performance.


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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About System One

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System One helps employers get work done more efficiently and economically without compromising quality. Over our 35+ year history, we've helped connect thousands of talented people with innovative companies. The excitement of a perfect fit motivates us every single day.

Industry

Business consulting services and recruiting and staffing services

Company size

5,001 - 10,000 Employees

Headquarters location

Pittsburgh, PA, US

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