Proposal Writer Intern in London

Location: Remote, UK (Ideally London or Manchester)

Employment Type: Internship (Full-time)

Programme Duration: Monday 6th July 2026 to Friday 11th September 2026

OneStream is seeking motivated candidates for its 2026 internship program. Interns will gain hands‐on experience, collaborate with professionals, and work on impactful projects in a fast‐paced environment. Our internship is intended for rising seniors and graduate students enrolled in a degree‐seeking program, with graduation expected after the internship program concludes. If you’re eager to learn and ready to take the next step in your career, we’d love to hear from you.

The Proposal Team are looking for a Proposal Writer Intern to join our Sales Operations team. As a Proposal Writer Intern, you will support OneStream's sales organization in the RFP/RFI process by preparing well‐written, accurate and cohesive proposals. Exceptional writing, editing/formatting, organization, collaboration and time management skills are a must.

Primary Duties & Responsibilities:

• Assist with RFI/RFP projects – from initial receipt from sales to final submission to the client – to ensure an on‐time submission.
• Coordinate the contributions of project team members (i.e., sales, solution consulting, finance, legal, product management, and other SMEs, as needed) and manage internal deadlines to develop high quality, compliant responses.
• Participate in team alignment calls and strategy discussions to clarify scope of work, gain insights into the business opportunity, establish internal milestones, understand key messages.
• Respond to corporate‐oriented RFI/RFP questions.
• Manage the proposal finalization process—formatting proofreading and editing for accuracy, clarity and readability.
• Assist with knowledge/content library.
• Proactively manage a workload that includes responsibility for multiple proposal assignments and other tasks, as required, in a fast‐paced, deadline‐driven environment.

Required Education:

In pursuit of a Bachelors degree or Masters degree in a relevant business area such as Marketing, Writing/Technical Writing or Information Technology.

Preferred Education & Experience:

Undergraduate students preferred (graduating between Winter 2026 and Spring 2027). Previous internship experience is nice to have but not necessarily required. Experience in Microsoft Office Suite – PowerPoint, Outlook, Excel.

Knowledge, Skills & Abilities:

• Able to effectively prioritize among multiple, competing, high priority RFI/RFP responses.
• Excellent communicator (written and oral), able to translate complicated ideas into language easily understood by others.
• Ability to thrive in a fast paced, highly collaborative and cross‐functional team setting.
• Exceptional organizational and project management skills.
• Strict attention to detail and accuracy; expert formatting, editing and proofreading skills.
• Project and time management skills.
• Team player, able to work both collaboratively and independently.

Who We Are:

OneStream is how today's Finance teams can go beyond just reporting on the past and Take Finance FurtherTM by steering the business to the future. It’s the only enterprise finance platform that unifies financial and operational data, embeds AI for better decisions and productivity, and empowers the CFO to become a critical driver of business strategy and execution. Our vision is to be the operating system for modern finance, digitizing core financial functions and empowering the CFO to become a critical driver of business strategy.

Why Join The OneStream Team:

• Transparency around corporate structure, salary, and benefits.
• Core value of customer success.
• Variety of project work (not industry‐specific).
• Strong culture and camaraderie.
• Multiple training opportunities.

All candidates must be legally authorized to work for any company in the country where this position is located without sponsorship. OneStream is an Equal Opportunity Employer.