OneStream Developer

MANTECH seeks a motivated, career and customer-oriented OneStream Consultant to join our team. This is a remote position. At MANTECH we are re-engineering the financial backbone of the U.S. Government. We provide highly configured, mission-critical Planning, Programming, Budgeting, and Execution (PPBE) and Financial Close and Reporting solutions leveraging the OneStream platform. As an OneStream Consultant, you will serve as a technical lead and subject matter expert for our most complex implementations. You will transition from pure building to architecting—designing entire application modules, translating functional requirements into technical blueprints, and guiding a team of associates to deliver high-performance solutions. You will own the technical quality of the application, ensuring performant business rules, streamlined security, and scalable data models. Responsibilities include but are not limited to: Lead the design of application modules (e.g., PPBE, Workforce, Capital, Capex), creating technical specifications that translate functional requirements into scalable OneStream architecture. Write and optimize complex Business Rules of all types (Finance, Parser, Connector, Extender) and design sophisticated Workflow strategies to solve unique client challenges. Design dynamic data load processes and Custom Tables for complex datasets; create Variance Analyses to validate data integrity between source systems and OneStream. Parse complex requirements into development tasks for Associate Consultants; conduct code reviews, teach troubleshooting techniques, and support junior staff in resolving helpdesk tickets. Configure and modify MarketPlace Solutions (e.g., Line Item Modeling, Task Manager, etc.) and integrate them into the core application. Design and implement comprehensive reporting strategies using BI Viewer, Extensible Documents, and Cube Views, ensuring optimal performance and usability. Consulting Mindset: Listen carefully to what others need (client and team members) and be willing and ready to respond to those needs to the best of your ability; look beyond the “easy” answer working collaboratively to bring the best Mantech has to offer to exceed others’ expectations. Minimum Qualifications: Bachelor’s degree in computer science, Systems Engineering, Information Systems, or related field. 5+ years of relevant experience in software development or financial systems implementation. 3+ years of dedicated OneStream implementation experience. 1+ years of OneStream XF implementation, configuration, and optimization experience Advanced proficiency in VB.NET or C# and SQL. Strong understanding of OneStream architecture, including Data Management, Cube Design, and Security. Preferred Qualifications: Experience with the federal Planning, Programming, Budgeting, and Execution (PPBE) process or financial management within the government sector. Experience assisting with ATOs, Single Sign-On (SSO), or working in a professional services/consulting firm. OneStream Certified Professional (OCP). Certified Government Financial Manager (CGFM) or Certified Defense Financial Manager (CDFM). CompTIA Security+ certification. Clearance Requirements: US Citizenship with the ability to obtain a Public Trust or higher. Physical Requirements: Must be able to remain in a stationary position 50% Frequently communicates with co-workers, management, and customers, which may involve delivering presentations Must be able to exchange accurate information in these situations