Software Developer

OneSource Virtual; Northern (KY); Hybrid; USD 90,000 - 130,000; Full time

Job summary

OneSource Virtual is seeking a Software Developer to design and develop backend components for enterprise financial and compliance apps. Remote US, full-time.

You will implement payroll tax calculations, payment processing, and secure data exchange with CRM platforms, using C#, .NET 8, MS SQL Server, and RESTful APIs. Collaboration across teams and adherence to IRS e-filing standards are required.

Qualifications

• Bachelor’s degree in a relevant field and 3 years of backend development experience.
• Expertise designing and maintaining backend services using C# and .NET (including .NET Core) for enterprise apps.
• Experience with RESTful APIs and secure auth (JWT, OAuth).
• MS SQL Server database design, querying, and optimization.
• Experience integrating financial systems and CRM platforms.

Responsibilities

• Design and develop backend components for payroll tax management and payment processing.
• Integrate with state tax portals and IRS e-filing standards.
• Build scalable RESTful APIs with robust error handling and audit logging.
• Collaborate with cross-functional teams to translate requirements into software logic.
• Modernize legacy modules with strong authentication and authorization.

Skills

C#

.NET

RESTful API

MS SQL

JWT

OAuth2

Financial Systems

System Integration

Education

Bachelor's degree in Computer Science, Computer Engineering, Computer Science and Telecommunications Engineering, or related field

Tools

MS SQL Server

Job description

## Software DeveloperApply: US-Remote: Full time: Posted Today: REQ-2026-358OneSource 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: [e-mail] & reference Job ID# OSV-TX26-SDEV in the subject line. EOE