Full Stack Developer
Merrifield, VA
Experience: 0
Category: Information Technology
Contractor Work Model: Hybrid
Brand: System One
Job ID: 346630
Date Posted: 02/20/2026
Shortcut: http://jobs.systemone.com/TBd5sB
Job Title: Senior Full Stack Developer (C#/.Net, React, JS)
Location: Vienna, VA
Work model: hybrid, 2-3 days onsite
Pay Rate: Open to Both C2C and W2 options
Position Type: Multiyear Contract
This role requires someone with a minimum of 10 years of extensive application full stack development experience with C#/.Net, React, and JS and a minimum of 10 years of experience in programming end to end custom code solutions.
Analyze business needs to develop and implement solutions that leverage systems and processes with a broad degree of latitude. Work with the business to understand their needs, related to information technology and enhance business processes by identifying new functionality. Utilize
advanced knowledge of the organization's technology
infrastructure and specific software applications to assist the business with implementing strategic vision through technology. Coordinate and conduct highly complex system analyses through data acquisition and modeling. Identify, coordinate, document, and implement business requirements by determining solutions that enhance business systems, as well as provide
support to business operations and processes. Work is performed under general direction.
Responsibilities
• Identify business requirements (e.g., needs, objectives, functions, features, input and output) and translate into delivered technical solutions
• Utilize the organization's approved software development tools and software applications to design, develop, implement and maintain custom code business solutions that align with business initiatives and corporate strategies
• Facilitate user acceptance testing to include developing and executing test cases, test criteria, scenarios, and communication with project teams; ensure acceptance of delivered solutions; validate and document results
• Partner with project teams to plan, coordinate and roll out software change/release to Controlled Testing and Production; obtain required approvals and transition project to production
• Provide follow-up to monitor the progress of planned improvement project implementations to ensure timely action, support and achievement of expected benefits
• Collaborate with key partners in the development and delivery of solutions
• Involved in cross-organizational task groups concerning new automated systems, products and/or services
• Perform annual recertification on the organization's standards as they relate to the platform
• Create and maintain accurate, detailed and consistent documentation through all phases of the Systems Development Life-Cycle
• Contribute knowledge management articles for created solutions
• Apply and communicate changes and new trends in systems/technology
• Evaluate operational efficiency and effectiveness
• Analyze information, requirements, data, work quality, work methods, processes, service specific practices, standards and metrics/statistics
• Interpret results of analysis; present recommendations, alternatives and implications
• Analyze, define and document technical design for data, workflow, logical processes, hardware and operating systems environment, interface with other systems, internal and external controls and output
• Identify and communicate key responsibilities and practices, evaluate results, and provide leadership and guidance to ensure successful implementation of business unit projects
• Develop, recommend and document adjustments to workflow to streamline processes
• Perform qualitative and quantitative analysis using analytical techniques, tools, models, simulation, etc.
• Partner with other business units and vendors to improve procedures, resolve problems, and implement initiatives; present conclusions and recommendations to management
• Utilize performance measurements and indicators to identify areas for
improvement; develop process improvement plans for each performance indicator or area identified
• Develop and oversee project plans and roadmaps that outline preventative and corrective actions necessary to remediate control deficiencies, maximize effectiveness and mitigate future exposure
Qualifications
• Expert knowledge of software development best practices
• Extensive experience in working with application development platforms (e.g., C# .Net, React, JavaScript, SQL, MongoDB, MuleSoft, Azure Cloud, etc.)
• Extensive experience in programming end-to-end custom-code solutions
• Extensive experience converting older language legacy solutions to modern languages
• Extensive experience building solutions from a process where no documentation exists
• Extensive experience working in lower and productions environments that are not completely isolated
• Extensive experience in developing and testing software
• Extensive experience with the organization's mainframe systems
• Extensive experience in the application of statistical methods, mathematical techniques, forecasting, cost-benefit analysis and related analytical tools
• Expert knowledge of data querying, reporting, forecasting, analysis and operations research, including statistical methods and modeling
• Ability to analyze technical issues in order to recommend, develop and/or implement strategies and achieve objectives
• Extensive experience in communicating complex technical issues to non-technical audiences
• Extensive experience in problem resolution including determining root cause, scope and scale of issues
• Extensive experience in leading collaborative work teams
• Extensive experience in leading projects and/or initiatives large in scope
• Extensive experience in managing multiple priorities independently and/or in a team environment to achieve goals
• Extensive experience that demonstrates the ability to research, compile, and document data, business processes, and workflow
• Participate in mandatory the organization's standards and policy training, including information security, testing, knowledge management, records information management and enterprise Architecture
Review Board standards
• Successfully complete required training, assessments and certifications to learn core principles of the citizen development application development platforms
• Advanced skill resolving conflicting requests and meeting changing requirements
• Expert research, analytical, and problem solving skills
• Expert skill interpreting and synthesizing large amounts of information
• Expert skill following, interpreting and applying relevant data/instructions to guidelines, procedures, practices and regulations
• Expert skill identifying and analyzing business requirements and recommending solutions
• Expert organizational, planning and time management skills
• Expert verbal, interpersonal and written communication skills
• Expert database, word processing, spreadsheet and presentation software skills
• Bachelor's degree in Information Technology, Computer Science, or related field, or the equivalent combination of education, training and experience
Desired Qualifications
• Master's degree in Information Technology, Computer Science, or related field
• Expert knowledge of the organization's Project Portfolio Management
System One, and its subsidiaries including Joulé, ALTA IT Services, 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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