Job Description:
Location: Slough
Contract Type: Permanent
At Mars, we believe the world we want tomorrow starts with how we work today. That means creating an environment where everyone feels welcome, valued, and able to grow.
We’re looking for a OneStream Process & Platform Manager to help us keep our financial systems running smoothly while continuously improving how we work.
You’ll be part of a collaborative team of three OneStream experts, supporting a global platform that drives better decisions across our business.
Whether you come from a traditional finance background, IT, or a mix of both. If you’re passionate about systems, problem-solving, and making an impact, we’d love to hear from you.
What will be your key responsibilities?In this role, you’ll take ownership of key parts of our OneStream environment and help ensure it performs at its best:
Support and execute administrative responsibilities within the OneStream application including metadata, workflows, data sources, transformation rules, cube views, dashboards, reporting, and user security.
Understand vb.net to support business rule and member formula troubleshooting and maintenance.
Support manual and automated interfaces and integrations with upstream and downstream systems.
Create and maintain technical documentation, including system configurations, processes and procedures, and integrations.
Troubleshoot user issues during the close process including conducting root cause analysis.
Support internal audit controls, processes, procedures, and documentation.
Provide recommendations for enhancements and upgrades.
Understand and support aspects of Software Development Life Cycle for OneStream enhancements.
Support OneStream user training and education as required.
Stay abreast of emerging technologies and trends in OneStream Solution Exchange including XF platform and solutions
We know great talent comes in many forms. Even if you don’t meet every requirement, we encourage you to apply.
Bachelor’s degree in finance, Accounting, Business Administration, IT, or a related field.
3+ years’ experience in EPM systems with 2+ years of OneStream experience.
Deep understanding of corporate accounting consolidation processes.
Strong understanding of Excel/MS Office.
Strong attention to detail.
Excellent communication skills in English both written and verbal.
Demonstrated and proven skill in completing assignments accurately and independently.
What can you expect from Mars?
Work with diverse and talented Associates, all guided by the Five Principles.
Join a purpose driven company, where we’re striving to build the world we want tomorrow, today.
A strong focus on learning and development support from day one, including access to our in-house Mars University.
An industry competitive salary and benefits package, including company bonus.
Ready to make an impact? Apply now and help us build the world we want tomorrow, today.
Skills Required
- Bachelor's degree in finance, Accounting, Business Administration, IT, or a related field
- 3+ years' experience in EPM systems with 2+ years of OneStream experience
- Deep understanding of corporate accounting consolidation processes
- Strong understanding of Excel/MS Office
- Strong attention to detail
- Excellent communication skills in English both written and verbal
- Demonstrated skill in completing assignments accurately and independently
Mars Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Mars and has not been reviewed or approved by Mars.
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Healthcare Strength — The benefits package is positioned as comprehensive, with broad medical coverage and additional protections like life insurance and short- and long-term disability. Mental health support is emphasized, including free mental health services and wellbeing programming under initiatives such as Mars Be Well.
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Parental & Family Support — Paid parental leave is highlighted as market-leading in the U.S., with an example of 18 weeks fully paid for both parents. Additional family-related leave types such as sick time for caregiving and bereavement leave are also described as part of the overall package.
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Retirement Support — Retirement offerings are described as strong, including 401(k) matching (with a 6% match cited) and pension plans in some cases. The broader package also references retirement savings options and contributions aligned to local market practice, supporting long-term financial security.
Mars Insights
What We Do
For more than a century, Mars, Incorporated has been driven by the belief that the world we want tomorrow starts with how we do business today. This idea is at the center of who we have always been as a global, family-owned business. Today, Mars is transforming, innovating and evolving in ways that affirm our commitment to making a positive impact on the world around us. Across our diverse and expanding portfolio of confectionery, food, and petcare products and services, we employ 133,000 dedicated Associates who are all moving in the same direction: forward. With $40 billion in annual sales, we produce some of the world’s best-loved brands including DOVE®, EXTRA®, M&M’s®, MILKY WAY®, SNICKERS®, TWIX®, ORBIT®, PEDIGREE®, ROYAL CANIN®, SKITTLES®, WHISKAS®, COCOAVIA®, and 5™; and take care of half of the world’s pets through our pet health services AniCura, Banfield Pet Hospitals™, BluePearl®, Linnaeus, Pet Partners™, and VCA™. We know we can only be truly successful if our partners and the communities in which we operate prosper as well. The Mars Five Principles – Quality, Responsibility, Mutuality, Efficiency and Freedom – inspire our Associates to take action every day to help create a world tomorrow in which the planet, its people and pets can thrive.
