App developer Jobs in Basel

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 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.

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 (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.

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. If this position does not fit your profile and you wish to be considered for another position directly, you can also send us your dossier via this ad or to jobs[at]itcag[dot]com.
Contact us for more information about our company, our positions or our attractive Payroll-Only programme: +41 41 760 77 01.

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.