OneStream Senior Developer – 6915 ADA
Our client is a leading Swiss multinational healthcare company headquartered in Basel, Switzerland. Operating in Pharmaceuticals and Diagnostics, it is one of the world’s largest biopharmaceutical companies and a global leader in in-vitro diagnostics and cancer treatments.
We are looking for a highly skilled and experienced OneStream Senior Developer for an initial 1 year contract basis with potential extension. You should have a proven track record of successful OneStream project implementations, exhibiting strong problem-solving abilities, and a passion for delivering high-quality software solutions.
This is a hybrid role requiring 3 days per week onsite in Basel .
The perfect candidate should have a Bachelor’s or Master’s degree in a relevant field and strong expertise in OneStream, including over five years of implementation and development experience. It involves hands‑on work with system configuration, business rules (C#), data transformations, reporting, workflows, and financial consolidation processes.
Candidates should possess solid technical skills in VB.NET or C#, SQL, and modern integration methods, along with the ability to create technical documentation and support testing. Strong communication, problem-solving, and teamwork skills are essential, along with the ability to work in fast‑paced, project‑driven environments and support knowledge transfer within the organization.
Main Responsibilities
Design and Development: Contribute to the design, development, testing, and deployment of OneStream solution for finance consolidation, Tax (CbCR & Pillar-two) and ESG, including enhancements, customizations, and integrations.
System Implementation: Participate in the full lifecycle of our OneStream project, from design to go‑live and post‑implementation support.
Technical Leadership: Provide technical support and guidance to co‑workers, ensuring adherence to best practices and coding standards and fostering a culture of continuous learning and growth. Advocate for and ensure adherence to OneStream coding standards, best practices, and performance optimization.
Collaboration: Work closely with functional teams, project managers, and other stakeholders to understand business needs and translate them into technical solutions.
Documentation: Develop and maintain technical documentation, including design specifications, test plans, and user manuals.
Support and Maintenance: Provide ongoing support and maintenance for OneStream, including troubleshooting and issue resolution.
Qualifications and Experience
Relevant Swiss working/residency permit or Swiss/EU-Citizenship required
Bachelor’s degree in Computer Science, Systems Engineering, Information Systems, or related field.
Deep technical expertise in OneStream, with 5+ years of OneStream implementation and development experience (OneStream certification preferred).
Developing complex Business Rules (C#) for calculations, validations, and data transformations.
Business‑focused, results‑oriented approach with excellent coordination, exceptional problem‑solving, and analytical skills, with a mindset to challenge assumptions, resolve discrepancies and ensure integrity of consolidated results.
Hands‑on configuration and development experience: building and managing dimensions, hierarchies, and member properties.
Designing and building Cube Views, Dashboards, and Reports.
Designing and building workflows, user role/permissions & securities.
Developing data transformation rules (ETL) to map source data to OneStream's data model.
In‑depth understanding of Financial Consolidation topics, month‑end close processes and ability to hold discussions with business counterparts.
Team and hands‑on working style, good organisational skills with ability of multi‑task while working independently or within a group environment.
Ability to work effectively in a project‑oriented, fast‑paced, deadline‑driven environment.
Business fluent English language skills (written and spoken).
Hands‑on experience in implementing, configuring and developing reporting within the OneStream platform.
Understanding of modern software architecture, integration tools, and methods (e.g., Data Connectors, APIs, ETL solutions).
Advanced proficiency in VB.NET or C# and SQL.
Ability to create technical design documents, and facilitate or validate system and user acceptance testing.
Participates in knowledge transfer to build internal capacity, advising, and training the internal team on the new application.
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