Design and develop backend components for enterprise payroll tax, financial, payment processing, and compliance applications. Build scalable RESTful APIs with C# and .NET, optimize Microsoft SQL Server databases, integrate financial systems with CRM platforms and state tax portals, implement secure authentication, automate high-volume processing, modernize legacy modules, and ensure auditability, reliability, and regulatory compliance.
OneSource Virtual (OSV) has worked exclusively with Workday customers since 2008 to deliver compliant, in-tenant technology and expert services to automate the administrative, transactional tasks of payroll, taxes, earned wage access, accounts payable, and benefits. With over 1,500 customers, 92% retention, and $225+ billion in treasury movement annually, OSV helps organizations maximize their Workday investment and operate it with confidence. Payroll, benefits, and finance solutions — all in one place.
DUTIES: Design and develop backend components for enterprise financial and compliance applications, focusing on payroll tax management for state withholding and unemployment insurance (e.g., Alabama A-6, Georgia G-7, Michigan 5080, Washington PFML), payment processing, and electronic filing; leveraging C#, .NET Core, .NET 8, and MS SQL Server to build scalable RESTful APIs, integrating with state tax portals (e.g., My Alabama Taxes, Georgia Tax Center) and ensuring compliance with IRS e-filing standards, with robust error handling and audit logging. Integrate business applications with CRM platforms to enable secure and efficient data exchange of customer, payroll tax, and compliance information, using RESTful APIs and industry-standard authentication protocols such as JWT, OpenID, OAuth2. Develop and maintain data-intensive systems to support high-volume processing of financial transactions, tax liabilities, and compliance reports, leveraging background job schedulers (e.g., CRON jobs, background services) to optimize automation and system performance. Modernize and secure legacy application modules by implementing robust authentication and authorization mechanisms, refactoring code for maintainability, and ensuring compliance with evolving business and security standards. Collaborate with cross-functional teams to translate complex business requirements into robust software logic for tax calculations, payment distribution, data validation, and reporting, ensuring solutions meet organizational and regulatory standards. May work from a home office and anywhere in the U.S. #LI-DNI MINIMUM REQUIREMENTS: Bachelor’s degree in Computer Science, Computer Engineering, Computer Science and Telecommunications Engineering, or related field, and 3 years of work experience to involve: (1) demonstrated expertise in designing, developing, and maintaining backend components and services using C# and the .NET framework (including .NET Core) for enterprise-scale applications, with a focus on reliability, scalability, and maintainability; (2) RESTful API development and secure authentication, including the implementation of industry-standard authentication and authorization protocols such as JWT and OAuth; (3) MS SQL/Database design and optimization, including design, implement, and optimize relational database schemas, stored procedures, and queries using Microsoft SQL Server (MS SQL) to support data-intensive business processes and ensure high performance and data integrity. Additionally, 2 years of experience to involve: (4) development experience in Financial Systems and System Integration, including the design, development, and maintenance of financial solutions and compliance reporting; and (5) proven ability to develop and implement integration solutions between financial systems and CRM platforms. May work from a home office and anywhere in the U.S.Application Instructions: Email: [email protected] & reference Job ID# OSV-TX26-SDEV in the subject line. EOE
You are encouraged to learn and share ideas when you join the OneSource Virtual team. We reward innovative thinking, fresh perspectives, creative collaboration, and hard work. As an organization experiencing routine strategic growth, we are always on the lookout for intelligent, talented, and forward-thinking professionals to join our team. OSV employees enjoy a values-based culture, upward mobility, and professional development with opportunities of all kinds.
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Home to tech titans like Microsoft and Amazon, Seattle punches far above its weight in innovation. But its surrounding mountains, sprinkled with world-famous hiking trails and climbing routes, make the city a destination for outdoorsy types as well. Established as a logging town before shifting to shipbuilding and logistics, the Emerald City is now known for its contributions to aerospace, software, biotech and cloud computing. And its status as a thriving tech ecosystem is attracting out-of-town companies looking to establish new tech and engineering hubs.
Key Facts About Seattle Tech
- Number of Tech Workers: 287,000; 13% of overall workforce (2024 CompTIA survey)
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