Legacy .NET Developer

Vienna, VA

Apply Apply with LinkedIn
Save

Type: Contract

Experience: 0

Category: Information Technology

Contractor Work Model: Hybrid

Brand: System One

Job ID: 379466

Date Posted: 09/01/2026

Shortcut: http://jobs.systemone.com/vL5CAT


Job Title: Full Stack Developer
Location: Vienna, VA
Type: Contract
Compensation: Open to Both C2C and W2 options
Work Model: Hybrid – onsite and remote

Responsibilities
• Identify business requirements (e.g., needs, objectives, functions, features, input and output) and translate into delivered technical solutions
• Utilize approved company 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 company 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
• Perform other duties as assigned

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 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 company 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

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.

#M2
#LI-EL1
Ref: #851-Rockville-S1

  • Full Stack Developer

    Vienna, VA

    Job Title: Full Stack Developer Location: Hybrid Work Model Reporting to Vienna, VA or Pensacola, FL Pay Rate: Open to Both C2C and W2 options Position Type: Multiyear Contract Description Analyze business needs to develop and implement solutions that ...

    Date Posted: 07/13/2026 Recommended

  • Pega Developer

    Merrifield, VA

    Job Title: Pega Developer Location: Vienna, VA Type: Contract Work Model: Hybrid – onsite and remote Responsibilities Identify business requirements (e.g., needs, objectives, functions, features, input and output) and translate into delivered technical...

    Date Posted: 08/12/2026 Recommended

  • Senior/Lead Test Engineer

    Merrifield, VA

    Title: Senior/Lead Test Engineer Location: Remote Pay Rate: Open to Both W2 and established 1099's Position Type: Contract Candidates MUST LIVE in the United States and be able to pass both a credit and criminal background check. We are able to work wi...

    Date Posted: 09/02/2026 Recommended

  • Lending Systems Software Tester

    Merrifield, VA

    Job Title: Lending Systems Software Tester Location: Hybrid onsite 3 days per/week - Vienna, VA Position Type: Multiyear Contract Pay Rate: Open to W2 ONLY (no c2c) Great opportunity with top-tier financial institution! We are currently seeking a Softw...

    Date Posted: 08/14/2026 Recommended

  • Technical Systems Analyst

    Arlington, VA

    Senior Technical Systems Analyst 6 Month Contract to Hire Active Secret Clearance or higher 4 days a week on-site, Arlington, VA Hourly Rate: $75/hr to $80/hr. W2. Benefits available Overview System One is seeking an experienced Technical Systems Analy...

    Date Posted: 08/28/2026 Recommended

  • AI/ML Software Test Engineer (GenAI & Chatbot Solutions)

    Columbia, MD

    Job Title: AI/ML Software Test Engineer (GenAI & Chatbot Solutions) Location: Columbia, MD Type: Contract Compensation: $62 /hr Work Model: Hybrid – onsite and remote Position Summary Seeking a Software Engineer to support innovative Machine Learning (...

    Date Posted: 09/03/2026 Recommended

  • ForgeRock Developer

    Pittsburgh , Pennsylvania

    Role: ForgeRock Developer Location: ForgeRock Developer with a passion for solving business problems to join our team in Salt Lake City, UT Your future duties and responsibilities How you'll make an impact . Provide support and maintenance of various s...

    Date Posted: 08/12/2026 Recommended

  • Senior SDET (Java, Playwright, TypeScript, AWS)

    Reston, VA

    Job Title: Senior SDET (Java, Playwright, TypeScript, AWS) Location: Reston, VA Type: Contract - possible extensions and / or conversion Compensation: $77 per hour Work Model: Hybrid – onsite weekly and ocassionally as needed for meetings Overview We a...

    Date Posted: 09/02/2026 Recommended

  • Control Systems Specialist

    Everett, WA

    Job Title: Control Systems Specialist Location: Everett, WA Type: Contract (yearlong) Compensation: up to $74.00 per hour Work Model: Onsite – onsite Hours: 40.0 Overview System One is hiring a Control Systems Specialist local to Everett, WA to support...

    Date Posted: 08/17/2026 Recommended

  • ForgeRock Developer

    South Main St Salt Lake City,, Utah

    Job Title: ForgeRock Developer Duration : Contract to Hire Location : Midvale/Salt Lake City, UT Work Mode : 5 Days Onsite Systemone is looking for a talented, driven, and experienced ForgeRock Developer with a passion for solving business problems to ...

    Date Posted: 08/12/2026 Recommended

  • ServiceNow Developer

    Fort Meade, Maryland

    Job Title: ServiceNow Developer Location: Fort Meade, Maryland Type: Contract Contractor Work Model: Onsite – onsite Security Clearance: Must hold an active DoD Secret clearance and obtain Security+ certification within 14 days of hire. Responsibilitie...

    Date Posted: 06/09/2026 Recommended

  • Sr Solutions Architect (Workday HCM, Time Tracking and Absence)

    Norcross, GA

    Job Title: Sr Solutions Architect (Workday HCM, Time Tracking and Responsibilities • Act as a trusted advisor to HR, Payroll, IT and business leaders, lead the end-to-end solution architecture for Workday HCM, Time Tracking, and Absence modules • Desig...

    Date Posted: 06/29/2026 Recommended

  • Software Developer

    McLean, VA

    Software Developer Practice: Software Development & Support / Digital Company: Guidehouse Location: Remote Security and Work Authorization Requirements • Must be able to obtain and maintain a Federal or Department of Defense Public Trust. • Candidates ...

    Date Posted: 08/25/2026 Recommended

  • Mainframe Developer (COBOL, CICS, DB2)

    Salt Lake City, UT

    Job Title: Mainframe Developer (COBOL, CICS, DB2) Description: Mainframe Developer (COBOL, CICS, DB2) Position Description Are you an experienced Mainframe Developer (COBOL, CICS, DB2) looking to work on mission critical enterprise systems that support...

    Date Posted: 07/28/2026 Recommended

  • AWS Backend/Salesforce Integration Rules Engine Developer

    REMOTE, Virginia

    Job Title: AWS Backend/Salesforce Integration Rules Engine Developer Location: REMOTE Security Clearance: Must be willing and able to obtain a CMS T4 Public Trust clearance - Must be a US Person and have lived in the United States at least three (3) ou...

    Date Posted: 08/27/2026 Recommended

  • Data & Systems Analyst

    McLean, VA

    Job Title: Data & Systems Analyst - Modernization Location: McLean, VA – can be Remote (EST) Type: Contract to Hire Clearance: Ability to obtain a Federal/DoD Public Trust. Active Public Trust preferred About the Role The Data Analyst will support the ...

    Date Posted: 08/25/2026 Recommended

  • Construction Project Manager

    Hardeman County, TX

    Job Title: Project Manager - Data Center Construction Location: Hardeman County, TX Type: Direct Hire Schedule: Onsite System One is seeking an experienced, Project Manager to lead the successful execution of complex, fast-paced mission critical and da...

    Date Posted: 08/14/2026 Recommended

  • Graffana ELK Software Development Lead

    Pittsburgh , Pennsylvania

    Job Title: Graffana ELK Software Development Lead Location: Pittsburgh, Pennsylvania Type: Full Time Work Model: Onsite – onsite Responsibilities Lead the design, development, and implementation of enterprise observability and monitoring solutions usin...

    Date Posted: 06/29/2026 Recommended

  • Design Engineer II

    Seminole, OK

    Job Title: Design Engineer II Location: Seminole, OK Type: Direct Hire Work Model: Onsite Responsibilities Design new product and support all phases of the product lifecycle, including development, testing, and manufacturing. Analyze customer requireme...

    Date Posted: 08/12/2026 Recommended

  • Senior GIS/AWS Developer/Engineer (onsite)

    Washington, DC

    Senior GIS/AWS Developer/Engineer Washington, DC – 100% Onsite Per Federal contract U.S. citizenship is required Must be able to obtain Public Trust clearance W2 or C2C Application Deadline: 9/15 The Senior Application Developer/Engineer/Programmer wil...

    Date Posted: 09/03/2026 Recommended

  • Senior Java Full Stack Engineer (AWS Cloud Migration)

    Reston, Virginia

    Senior Java Full Stack Engineer (AWS Cloud Migration) Location: Reston, VA (Hybrid) Type: Contract through December 2026 (potential extension) Schedule: 40 hours/week Local Candidates: DMV area only. Must be available for onsite meetings in Reston appr...

    Date Posted: 09/03/2026 Recommended

  • Corporate - Training Specialist

    Pooler, GA

    Job Title: Corporate - Training Specialist Location: Pooler, GA Type: Contract Work Model: Onsite – onsite System One is seeking a Training Specialist for a full-time position in Pooler, GA. The Manager of Construction Training is responsible for leadi...

    Date Posted: 08/24/2026 Recommended

  • (v) Software Engineer – FACETS Extensions / Application Development

    Baltimore, Maryland

    Software Engineer – FACETS Extensions / Application Development Location: Baltimore, MD (DMV Area – Baltimore, MD or Washington, DC) Type: Contract-to-Hire Work Model: Hybrid (Onsite & Remote) Hours: 40 Hours/Week (EST) Overview Our Client is embarking...

    Date Posted: 07/20/2026 Recommended

  • Full Stack Developer

    Merrifield, VA

    Full Stack Developer Location: Vienna VA - Hybrid - 1-2 days on site Pay Rate: Open to Both C2C and W2 options Position Type: Multiyear Contract Basic Purpose To support software development organizational initiatives by designing and implementing new ...

    Date Posted: 08/13/2026 Recommended

  • Business Systems Analyst – FX Trading Platform Modernization

    Salt Lake City, Utah

    Job Title: Business Systems Analyst – FX Trading Platform Modernization Location: Salt Lake City, Utah Work Mode : 5 Days Onsite Duration : Contract to Hire Responsibilities Lead business analysis, strategic planning, and migration initiatives supporti...

    Date Posted: 08/06/2026 Recommended

  • Java Developer

    McLean, VA

    Java Full Stack Developer 100% Remote Sponsorship is not available for this position. Candidates must be able to obtain a Public Trust. What You Will Do Join an exciting and meaningful program supported by a collaborative team of more than 200 professi...

    Date Posted: 08/26/2026 Recommended

  • ServiceNow Developer

    Melbourne, FL

    Job Title: ServiceNow Developer Location: Melbourne, FL Overview System One is seeking a ServiceNow Developer for a long-term opportunity in Melbourne , FL. This individual will play a key role in designing, developing, and maintaining ServiceNow solut...

    Date Posted: 08/26/2026 Recommended

  • ServiceNow Developer

    Miramar, FL

    Job Title: ServiceNow Developer Location: Miramar, FL Overview System One is seeking a ServiceNow Developer for a long-term opportunity in Miramar, FL. This individual will play a key role in designing, developing, and maintaining ServiceNow solutions ...

    Date Posted: 08/26/2026 Recommended

  • (ii) Technical Program Manager / Technical Delivery Manager – FACETS

    Baltimore, Maryland

    TECHNICAL PROGRAM MANAGER / TECHNICAL DELIVERY MANAGER – FACETS Location: Baltimore, MD or Washington, DC Type: Contract to hire Model: Hybrid - Both on-site and remote. Schedule: 40 hours/week (EST) JOB OVERVIEW We are seeking an experienced Technical...

    Date Posted: 07/21/2026 Recommended

  • IT Project Coordinator

    Virginia, VA

    Job Title: Project Coordinator Type: Contract Compensation: 50.00-60.00/hr W2 Work Model: Remote Hours: 40.0 Security Clearance: Not specified in the job description or fields Responsibilities Support project strategy, planning, scheduling, and coordin...

    Date Posted: 07/29/2026 Recommended