About The Role
RadixArk is seeking an Executive Assistant to support our founding team as we scale world-class AI infrastructure. You'll work directly with our founders to manage complex schedules, coordinate high-stakes meetings with investors and partners, and handle confidential matters with discretion. This role requires exceptional organizational skills, strong judgment, and the ability to thrive in a fast-paced technical environment where priorities shift rapidly.
Requirements
5+ years of experience as an Executive Assistant supporting C-level executives, preferably in tech or AI startups
Proven ability to manage complex calendars, coordinate international travel, and handle competing priorities
Exceptional written and verbal communication skills with strong attention to detail
High degree of professionalism, discretion, and ability to handle confidential information
Proactive problem-solver who anticipates needs and takes initiative
Experience with Google Workspace, Slack, expense management, and project coordination tools
Ability to work flexible hours to accommodate meetings across time zones
Experience in fast-paced startup environments; familiarity with AI/ML industry is a plus
Bachelor's degree preferred
Responsibilities
Manage complex calendars for founders: scheduling meetings, resolving conflicts, optimizing time allocation
Coordinate domestic and international travel: flights, accommodations, itineraries, visas
Prepare materials for board meetings, investor meetings, and strategic discussions
Handle expense reporting, invoice processing, and budget tracking for executive activities
Coordinate high-priority meetings with investors, partners, customers, and team members
Manage confidential matters with discretion: fundraising, partnerships, strategic initiatives
Serve as primary point of contact between founders and internal/external stakeholders
Organize company offsites, board meetings, and strategic planning sessions
Support special projects: research, analysis, documentation, presentation preparation
Maintain organizational systems for documents, decisions, and action items
Partner with Office Manager and team leads to ensure smooth operations
About RadixArk
RadixArk is an infrastructure-first company built by engineers who've shipped production AI systems at xAI, created SGLang (20K+ GitHub stars, the fastest open LLM serving engine), and developed Miles (our large-scale RL framework). We're on a mission to democratize frontier-level AI infrastructure by building world-class open systems for inference and training. Our team has optimized kernels serving billions of tokens daily, designed distributed training systems coordinating 10,000+ GPUs, and contributed to infrastructure that powers leading AI companies and research labs. We're backed by well-known investors in the infrastructure field and partner with Google, AWS, and frontier AI labs. Join us in building infrastructure that gives real leverage back to the AI community.
Compensation
We offer competitive compensation with equity, comprehensive health benefits, and flexible work arrangements. Compensation is determined by location, level, and experience.
Equal Opportunity
RadixArk is an Equal Opportunity Employer and is proud to offer equal employment opportunity to everyone regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, veteran status, and more.
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