> Markdown version of [/jobs/ext/4047823-onestream-developer](https://www.wearedevelopers.com/jobs/ext/4047823-onestream-developer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # OneStream Developer - **Company:** Refresco - **Location:** Rotterdam, Netherlands - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** .NET Framework, Application Programming Interfaces (APIs), Application Performance Management, Microsoft Azure, C Sharp (Programming Language), Cloud Computing, Code Review, Databases, Continuous Integration, Data Governance, Data Integration, Extract Transform Load (ETL), Data Mining, Data Warehousing, Relational Databases, Financial Software, Integrated Development Environments, Microsoft Visual Studio, Microsoft SQL Server, Visual Basic .NET (Programming Language), SAP ERP, Oracle (Applications), Release Management, OneStream, Secure Coding, Software Engineering, SQL Databases, Systems Integration, Software Organization, Enterprise Application Integration, Enterprise Software Applications, .NET Core, Snowflake, Software Troubleshooting, Technical Debt, Git, HR Software, Information Technology, Deployment Automation, SAP S/4HANA, Data Management, Software Version Control, Data Pipelines - **Published:** October 20, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=1782f745c151c473 ## About the Role * Bachelor's or Master's degree in: Computer Science / Information Technology /Software Engineering / Business Information Systems or a comparable discipline * 3+ years of software development experience * Experience with CPM, EPM, or Financial Systems implementations. * Hands-on experience with OneStream development is preferred. * Experience supporting Finance applications within an enterprise environment., * Strong proficiency in: + C# + VB.NET + .NET Framework / .NET Core * Experience developing: + Custom Business Rules + Calculations + Workflows + Automation solutions + Application extensions Data & Integration * Strong SQL development skills. * Experience with relational database platforms such as: + Microsoft SQL Server + Oracle + Snowflake (preferred) * Experience designing ETL and data integration processes. * Understanding of API and enterprise application integration concepts. Tools & Development Environment * Proficiency with: + Visual Studio + Visual Studio Code + Git + Azure DevOps (preferred) + OneStream Developer Studio * Experience with source control, code reviews, and release management processes. * Understanding of CI/CD concepts and deployment automation., * Strong analytical and problem-solving skills. * Excellent communication and stakeholder management capabilities. * Ability to work independently and within cross-functional teams. * Attention to detail and commitment to high-quality delivery. * Continuous improvement mindset. * Ability to manage multiple priorities in a dynamic business environment., * OneStream Certified Professional. * Experience with SAP S/4HANA integration. * Experience in a multinational manufacturing or consumer goods environment. * Knowledge of cloud technologies and Azure platforms. * Familiarity with financial data governance and compliance requirements. ## Description The OneStream Developer is responsible for the design, development, enhancement, integration, and ongoing support of the OneStream Corporate Performance Management (CPM) platform. This role ensures that OneStream solutions meet business requirements for Financial Planning & Analysis (FP&A), Consolidation, Reporting, Forecasting, and Financial Data Management. The successful candidate will develop custom business functionality, automate financial processes, build integrations with enterprise applications, and contribute to the continuous improvement of the OneStream platform. The role requires strong .NET development expertise, database knowledge, and experience with modern software development practices., * Design, develop, and maintain custom OneStream solutions. * Create and enhance Business Rules, Calculations, Workflows, Dashboards, and Data Management processes. * Develop automation solutions to improve financial processes and reduce manual effort. * Implement custom functionality using OneStream extensibility features. * Support enhancements related to Financial Consolidation, Planning, Budgeting, Forecasting, and Reporting., * Develop custom Business Rules and application extensions using C# and VB.NET. * Build, test, and deploy .NET-based solutions within the OneStream platform. * Create automation routines, calculations, and validation logic supporting business requirements. * Optimize application performance and troubleshoot complex technical issues. * Ensure maintainable, scalable, and secure coding practices., * Design and maintain integrations between OneStream and enterprise systems such as: SAP S/4HANA, SAP ECC, Data Warehouses, HR Systems, Treasury Applications and other Finance Applications * Develop and maintain ETL processes and data pipelines. * Write and optimize SQL queries, procedures, and data extraction routines. * Support master data management and data governance activities. * Ensure data quality, reconciliation, and integrity across all connected systems., * Utilize modern development environments including: Visual Studio, Visual Studio Code, OneStream Developer Studio * Apply source control and version management using Git. * Support CI/CD processes and structured release management. * Participate in testing, deployment, and production support activities. * Maintain technical documentation and development standards., * Collaborate with Finance, Controlling, FP&A, IT, and external implementation partners. * Analyze business requirements and translate them into technical solutions. * Provide third-level technical support for OneStream incidents and enhancements. * Participate in project initiatives, upgrades, and platform optimization activities. * Support system audits, compliance requirements, and internal controls., + Financial Consolidation + Management Reporting + Budgeting & Forecasting + Financial Planning & Analysis (FP&A) + Corporate Performance Management (CPM), The OneStream Developer will be successful when: * OneStream applications operate reliably and efficiently. * Financial processes are automated and standardized. * Integrations deliver accurate and timely data. * Enhancements are delivered according to agreed timelines and quality standards. * Business stakeholders experience improved reporting, planning, and consolidation capabilities. * Technical debt is minimized through adherence to development standards and best practices. Refresco Leadership Expectations The role holder demonstrates ownership, accountability, collaboration, continuous improvement, customer focus, and a commitment to delivering business value through technology-enabled financial solutions.