OneStream Senior developer

OneStream Senior developer- OneStream/System Configuration/Business Rules (C#/VB.NET/ETL/SQL/IVD/Modern Integration Methods/English

Project:
For our customer a big pharmaceutical company in Kaiseraugst we are looking for a highly qualified
OneStream Senior developer

Background:
We are seeking a highly skilled and experienced OneStream developer with a proven track record of successful OneStream project implementations, exhibiting strong problem-solving abilities, and a passion for delivering high-quality software solutions.

The perfect candidate: The role requires a bachelor'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.

Tasks & 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 life cycle 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.

Must Haves:
* 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).
* Hands-on configuration and development experience:
* Building and managing dimensions, hierarchies, and member properties.
* Developing complex Business Rules (C#) for calculations, validations, and data transformations
* 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.
* 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.
* 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.
* Excellent interpersonal and customer relationship skills.
* Exceptional communication and influencing skills.
* 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 (eg, 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.

Reference Nr.: 924850SDA
Role: OneStream Senior developer
Industrie: Medical
Workplace: Kaiseraugst
Pensum: 80-100%
Start: 01.06.2026 (Latest Start date 01.09.2026)
Duration: 12 months
Deadline: 02.04.2026

If you are interested in this position, please send us your complete dossier.

About us: ITech Consult is an ISO 9001:2015 certified Swiss company with offices in Germany and Ireland. ITech Consult specialises in the placement of highly qualified candidates for recruitment in the fields of IT, Life Science & Engineering.
We offer staff leasing & payroll services. For our candidates this is free of charge, also for Payroll we do not charge you any additional fees.