Financial Systems Specialist OneStream
Optiver is a global technology- and research-driven proprietary trading firm and market maker providing liquidity across financial markets, including through an active 24/7 Digital Assets desk.
About Optiver
Founded in Amsterdam in 1986, Optiver uses its own capital, quantitative research and proprietary technology to continuously quote, price and trade financial instruments across global markets. Its activities include listed derivatives, cash equities, ETFs, bonds, foreign currencies and digital assets; its Digital Assets desk operates crypto options market-making strategies across major venues with follow-the-sun coverage.
Skills
Candidate Availability
Required and preferred rules are kept separate and reflect the wording in the original posting.
About the Role
You will take end-to-end technical ownership of OneStream, including configuration, integrations, security, support, and improvement. You will lead the Phase 2 rollout across Finance and Tax, manage platform changes and vendor relationships, assess system impacts, automate workflows, document solutions, and mentor colleagues.
Requirements
- At least 3 years of OneStream platform administration, ownership, or implementation experience
- 4–6 years of experience in financial systems, finance transformation, or CPM consulting
- Experience with financial systems such as NetSuite, Workday, or Coupa
- SQL, data modelling, scripting, API, integration tooling, and version control knowledge
- Understanding of SaaS security, access controls, and audit requirements
- OneStream implementation or major rollout experience
- Understanding of group consolidation and the financial close cycle
- Experience using automation and AI to improve workflows
- Communication and technical documentation skills
Responsibilities
- Own and develop the OneStream platform, including configuration, metadata, hierarchies, business rules, workflows, integrations, and security
- Lead the Phase 2 rollout across Finance and Tax
- Transition platform ownership from the implementation partner and manage vendor relationships, releases, and upgrades
- Assess and manage integrations with NetSuite, source systems, and reporting solutions
- Provide period-close support, incident management, root cause analysis, and continuous improvement
- Maintain documentation and mentor colleagues
- Contribute to broader Finance Technology initiatives
Benefits
- Performance-based bonus structure
- 25 paid vacation days in the first year, increasing to 30 days from the second year
- Health insurance discounts
- Fully paid first-class commuting expenses
- Breakfast, lunch, dinner, and barista coffee
- In-house physio and chair massages
- Organized sports, leisure activities, and Friday drinks
- Relocation package
- Visa sponsorship where necessary for expats