ManTech is seeking a motivated, career and customer-oriented **OneStream Developer** to join our team. This will be a **remote** position. **Responsibilities include but are not limited to:** + Install, configure, analyze, tune, and optimize OneStream solutions on cloud and client infrastructure that meet customer requirements.  + Lead scoping and sizing of OneStream server, application, and database installation, configuration, and maintenance + Assist with data analysis, data management, data governance, dashboard monitoring, data quality dashboards, data controls, data lineage, and data mapping. + Troubleshoot and optimize security models, event processes, custom dashboards, reports, business rules, and member formulas. + Assess data unit, application, and scripting configurations to make recommendations on performance improvements + Perform unit, system, and interface testing.  + Develop and update process documents and training materials.  + Apply advanced theoretical knowledge of Computer Science and Engineering principles and concepts in creating, developing, writing, testing, troubleshooting and documenting code and interfaces for various financial management applications using OneStream tools and technologies. + Perform unit, stress, system, and integration testing associated with the OneStream tool and its corresponding system interface areas and provide guidance to client staff to support these testing activities and achieve successful user acceptance. + Assist in identifying and resolving issues and challenges related to OneStream applications in collaboration with the senior consulting team. + Collaborate with other members of the development team and project managers to deliver solutions that surpass client expectations while meeting project timelines. + Write System Security Plan and technical documents as a part of Authority to Operate package and remediate vulnerabilities found during ATO to meet compliance standards. + Write POAM documentation for all system security plan findings. + Implement Single Sign-On for OneStream XF application using PIV card or CAC authentication. + Manage upgrades of on premises OneStream XF applications and Microsoft SQL Databases **Minimum Qualifications:** + 4+ years of work experience in systems design, infrastructure, tuning/optimization, cloud, development, and deployment + Bachelor’s degree in computer science, engineering, information systems, mathematics, business, accounting, or related degree + 3+ years of SQL experience + 2+ years of OneStream XF installation, configuration, and optimization experience + Ability to identify project risks, provide risk mitigation options and escalate to projectmanagement to resolve project risks. + Ability to contribute to various phases of the software development cycle, including in systems analysis, architecture, design, development, configuration, testing, debugging, and documentation. + Ability to mentor junior developers. + CompTIA Security+ certification **Preferred Qualifications:** + Experience on SQL Server and/or Oracle databases. + VB.NET development experience and/or any object-oriented programming languages + Work experience in a professional services company and/or a consulting firm. + Master’s degree in computer science, engineering, or information systems + Experience assisting with ATOs. + Experience setting up Single Sign-On for applications. **Clearance Requirements:** + Interim Secret clearance to start with the ability to obtain a Secret clearance. ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran. If you are a qualified individual with a disability and require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please email us at careers@mantech.com and provide your name and contact information.