Executive Assistant & Office Manager

About the Role:
LMArena is looking is looking for a highly organized, resourceful, and proactive Office Manager & Executive Assistant to support our Chief Executive Officer and Chief Technology Officer. In this dual role, you’ll manage day-to-day operations at our headquarters and provide high-level administrative support to both executives. You’ll play a vital role in keeping our team running smoothly, creating a welcoming and efficient office environment, and serving as a trusted gatekeeper and strategic partner to our leadership team.

Responsibilities
Executive Support

• Manage complex and ever-changing calendars for the CEO and CTO, with a focus on maximizing impact and efficiency.

• Schedule and coordinate executive meetings, offsites, media interviews, and events.

• Greet and host external guests, investors, and press on behalf of the Founders.

• Act as a liaison between the founders and internal/external stakeholders.

• Proactively anticipate needs and resolve scheduling conflicts with discretion and sound judgment.

Office Management

• Oversee daily operations of the office at 1 Post Street, including reception, mail and package handling, and supply inventory.

• Ensure a professional, organized, and welcoming workspace environment.

• Maintain a physical presence in the office as a go-to person for coordination, questions, and support.

• Act as the face of the office—keeping the space secure, running smoothly, and aligned with company culture.

Team & Operational Support

• Assist with employee onboarding/offboarding logistics in partnership with Operations and Head of Enterprise Security & Engineering.

• Partner closely with the Head of Talent to support recruiting coordination and candidate experience.

• Coordinate with vendors, facilities management, and internal stakeholders for smooth daily operations.

• Support company-wide initiatives, team events, and ad hoc projects as needed.
  

Who is LMArena?

Created by researchers from UC Berkeley’s SkyLab, LMArena is an open platform where everyone can easily access, explore and interact with the world’s leading AI models. By comparing them side by side and casting votes for the better response, the community helps shape a public leaderboard, making AI progress more transparent, and grounded in real-world usage.

Why Join Us?

Trusted by organizations like Google, OpenAI, Meta, xAI, and more, LMArena is rapidly becoming essential infrastructure for transparent, human-centered AI evaluation at scale. With over one million monthly users and growing developer adoption, our impact is helping guide the next generation of safe, aligned AI systems—grounded in open access and collective feedback.

Trusted by organizations like Google, OpenAI, Meta, xAI, and more, LMArena is rapidly becoming essential infrastructure for transparent, human-centered AI evaluation at scale. With over one million monthly users and growing developer adoption, our impact is helping guide the next generation of safe, aligned AI systems—grounded in open access and collective feedback.

Our work is regularly referenced by industry leaders pushing the frontier of safe and reliable AI. Sundar Pichai, Jeff Dean, Elon Musk, and Sam Altman.

• High Impact: Your work will be used daily by the world’s most advanced AI labs.

• Global Reach: Develop data infrastructure powering millions of real-world evaluations, influencing AI reliability across industries at the top-tier

• Exceptional Team: We are a small team of top talent from Google, DeepMind, Discord, Vercel, UC Berkeley, and Stanford.

Requirements:

• 5+ years of experience as an EA, Office Manager, or in a similar operational role.

• Experience supporting senior leaders, ideally at a startup or fast-paced company.

• Strong time management, prioritization, and multitasking skills.

• Confident, calm under pressure, and comfortable working in a fast-changing environment.

• Excellent communication and interpersonal skills, with a warm, professional demeanor.

• Comfortable being on-site and owning the day-to-day flow of the office space.

Preferred Qualifications:

• Experience in corporate event planning

• Passion for AI, online research culture, or emerging tech communities is a strong plus.

What we offer:

• The cash compensation for this position has not been finalized. Actual compensation will depend on job-related knowledge, skills, experience, and candidate location.

• Competitive salary and meaningful equity

• Comprehensive healthcare coverage (medical, dental, vision)

• The opportunity to work on cutting-edge AI with a small, mission-driven team

• A culture that values transparency, trust, and community impact

Come help build the space where anyone can explore and help shape the future of AI.