Senior Software Engineer C#
Merrifield, Virginia
Experience: 0
Category: Information Technology
Contractor Work Model: Hybrid
Brand: System One
Compensation Range: 105000.00 - 120000.00
Job ID: 379635
Date Posted: 09/08/2026
Shortcut: http://jobs.systemone.com/oSg6Z3
Senior Software Engineer
C/C++ or C# Software Engineer
Direct-Hire
Location: Merrifield, VA – 4 days on-site/ 1 day remote
Annual Salary Range: $105,000 to $120,000 plus benefits
Federal End Customer: US Citizenship, eligibility for a Public Trust clearance required
Overview
We are seeking an experienced Senior Software Engineer to provide technical leadership and drive the design, development, and delivery of mission-critical software solutions. The ideal candidate will possess advanced software engineering expertise, strong development skills, and the ability to mentor team members while contributing hands-on to complex technical initiatives.
Join our team and help build innovative software solutions that drive business success while advancing your career in a dynamic and collaborative environment.
Responsibilities
- Lead the design, development, testing, deployment, and maintenance of software applications.
- Develop high-quality, scalable solutions using C, C++, and/or C#.
- Utilize Microsoft Visual Studio for architecture, development, debugging, and deployment activities.
- Collaborate with stakeholders, architects, and development teams to define technical requirements and solutions.
- Mentor junior and mid-level engineers through code reviews, technical guidance, and best practices.
- Drive software quality through testing, debugging, performance tuning, and continuous improvement efforts.
- Support and enhance CI/CD pipelines using Jenkins and related tools.
- Manage source code and development workflows utilizing GitHub and version control best practices.
- Integrate applications with enterprise systems and ensure adherence to software engineering standards.
Required Qualifications
- Bachelor's or Master's degree in Computer Science, Software Development, or a related technical field from an accredited university.
- 7+ years of professional software development experience. Experience developing applications using C# and the Microsoft .NET ecosystem. Experience with C/C++ is preferred.
- Advanced proficiency in C, C++, and/or C#.
- Extensive experience with Microsoft Visual Studio.
- Strong knowledge of CI/CD tools and processes, including Jenkins.
- Experience with GitHub and modern software development workflows.
- Familiarity with enterprise environments and EBS platforms or similar systems.
- Strong understanding of software architecture, design patterns, and development best practices.
- Demonstrated ability to lead technical initiatives and mentor development teams.
- Excellent analytical, troubleshooting, and communication skills.
Preferred Qualifications
- Experience serving as a technical lead on software development projects.
- Agile/Scrum certification or extensive Agile experience.
- Expertise in software testing, automation, and debugging methodologies.
- Experience integrating applications with enterprise-level platforms and systems.
- Experience supporting large-scale, mission-critical software environments.
- What We Offer
- Competitive salary and comprehensive benefits package.
- Challenging and meaningful projects with real-world impact.
- Opportunities for leadership and career advancement.
- Collaborative and innovative work environment.
- Ongoing training and professional development opportunities.
- Access to modern development tools and technologies.
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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⚠️ Protecting Job Seekers from Identity Scams
At System One, your privacy and security are important to us. As job-related scams continue to target job seekers, we want to help you recognize and avoid common recruitment fraud. Identity theft scams often involve individuals, also known as "scammers," posing as recruiters or employers to obtain sensitive personal information, such as Social Security numbers, bank account details, or copies of driver’s licenses, with the goal of stealing identities, accessing financial accounts, or creating fraudulent accounts in a victim’s name.