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 VB.NET /, 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.

Email address

About us

At principal33, we are driven by innovation, collaboration, and a commitment to excellence. Our mission is to deliver impactful solutions that empower our clients and inspire our teams. We are dedicated to cultivating a work environment that attracts top talent, drives innovation, and values diverse perspectives. Join us and become part of an organization that prioritizes growth, creativity, and meaningful impact every day.

OneStream Dev/Arch

Benefits

Job Description