OneStream Dev/Arch

Your mission ESSENTIAL FUNCTIONS Partner with finance and business stakeholders to understand requirements and translate them into scalable OneStream solutions Lead solution design, ensuring outcomes are robust, maintainable, and aligned to broader architecture and data strategy Develop and enhance OneStream applications across core use cases (reporting, planning, forecasting, reconciliations, and tax) Provide ongoing application support, troubleshooting issues and continuously improving existing solutions Act as a technical lead within the OneStream domain, guiding design decisions and promoting best practices Mentor and support junior team members, providing hands-on coaching and knowledge transfer Contribute to building internal capability and reducing reliance on external consultants Identify opportunities to optimise and evolve the platform, including leveraging new OneStream features and releases Proactively explore and apply AI-driven capabilities to improve development efficiency, automation, and business insight Drive reduction of technical debt and improve overall solution quality and sustainability Collaborate with architecture, infrastructure, data, and other system owners to ensure alignment and manage upstream/downstream impacts Support Agile delivery processes, including backlog refinement, estimation, and sprint planning Ensure high-quality delivery through structured testing and support for User Acceptance Testing (UAT) Manage deployments with appropriate controls, including release planning, runbooks, and hypercare support Maintain clear and accurate technical documentation to support knowledge sharing, auditability, and long-term maintainability Ensure compliance with organisational, regulatory, and security standards, including SOX requirements Stay current with OneStream platform developments, industry best practices, and emerging technologies, continuously bringing forward improvement ideas Your profile JOB REQUIREMENTS, QUALIFICATIONS, and COMPETENCIES Educational/ Experience Degree in Finance, Business, Information Systems, or a related field 5+ years’ experience delivering EPM solutions, including hands-on OneStream experience in a delivery or support capacity (implementation or post go-live evolution) Proven experience working across core EPM processes (consolidation, reporting, planning, forecasting) Strong understanding of the full software development lifecycle (SDLC) Experience operating in an Agile delivery environment Core Competencies Strong analytical and problem-solving capability, with the ability to diagnose and resolve complex issues Self-starter with high levels of ownership and a proactive approach to identifying and delivering improvements Operates effectively as an individual contributor while collaborating closely within a small, high-performing team Comfortable operating as a senior member of a small team, providing guidance and support to less experienced developers Continuous improvement mindset, with a focus on efficiency, quality, and long-term maintainability Adapts quickly to evolving technologies and development frameworks, with a willingness to adopt new approaches (e.g. assemblies, AI-assisted development) Technical/Functional Strong hands-on experience with OneStream, including business rules, data integration, and applicationevolving development approaches (including assemblies) in a production environment Experience with other EPM platforms (e.g. TM1, Oracle, SAP, Tagetik, Adaptive) beneficial, but OneStream expertise strongly preferred Proficiency in C# and/or /, including development of OneStream business rules development (or similar object-oriented programming)and/or assemblies Strong understanding of data models, dimensionality, and performance optimisation within EPM platforms Experience designing and building user-facing components (dashboards, forms, reporting interfaces) within OneStream or similar platforms Strong Excel skills to support analysis, validation, and user interaction Familiarity with source control and structured development practices (e.g. versioning, branching, deployment discipline) Strong focus on code quality, maintainability, and reusability Experience or interest in using AI-assisted development tools (e.g. Copilot) and exploring AI use cases within finance platforms Client Relationships Builds strong, effective relationships with finance stakeholders, acting as a trusted partner for solution delivery and platform evolution Collaborates effectively with internal teams and external partners to deliver outcomes and ensure alignment across systems and processes Communicates clearly and concisely with both technical and non-technical audiences Operates effectively in a high-demand, fast-paced environment, maintaining a solutions-oriented mindset Focused on delivering measurable business value through technology solutions Fluent in written and spoken English What we offer Benefits Medical insurance: Your health, and your family's, is our top priority. You're fully covered. Holiday flat in Valencia: Dreaming of sunny days in Spain? Our company flat is ready for your next getaway. Gifts for special occasions: We love celebrating you. Expect thoughtful surprises on Easter, Women's Day, Father's Day, and more. Anniversary gifts: Your 1st, 5th, and 10th work anniversaries are milestones worth celebrating, and we mark each of them with a special gift. Team-building events: We value connection beyond work, offering engaging team experiences in great locations to inspire collaboration and fun. End of year celebrations: We wrap up each year with a special celebration, filled with joy, laughter, and unforgettable moments. Day off on your birthday: Your special day is yours to enjoy, no work required. Community and social initiatives: We bring people together through activities like Bring Your Kids to the Office Day, donation drives, tree planting, sporting events, decorating the Christmas tree with your colleagues, celebrating new office openings, Principal33's anniversary, and more. Access to Udemy: Growth matters, so you get unlimited access to thousands of courses. Develop your skills anytime, anywhere. German language courses: Dedicated courses to help you build your German skills, supporting both personal and professional growth. Personal and professional growth: We support your development through masterclasses with experienced trainers, and we're open to investing in courses and training that help you grow.