Chief of Staff / Strategic Executive Assistant

About the Role

We’re looking for a Chief of Staff / Strategic Executive Assistant to partner directly with our founders and help scale the company through its next stage of growth. This is not a traditional Executive Assistant role. You’ll be a trusted operator responsible for helping leadership stay focused on the highest-impact priorities while driving execution across the business.

You’ll own a mix of executive operations, strategic projects, cross-functional coordination, recruiting support, and company operations. One moment you may be preparing materials for an investor meeting; the next, coordinating an important hiring process, improving an internal workflow, or driving a cross-functional initiative to completion.

You’ll report directly to the Head of Finance & Operations and work closely with the founders and leadership team. This is a unique opportunity to build the operational backbone of a fast-growing AI infrastructure company.

We move quickly, operate with urgency, and expect the same from everyone on the team.

What You’ll Own

Executive Partnership

Manage complex calendars, meetings, travel, and shifting priorities for company leadership

Prepare agendas, briefing materials, meeting notes, and follow-up action items to ensure decisions turn into execution

Anticipate bottlenecks, proactively solve scheduling conflicts, and optimize executive time

Handle confidential information with professionalism and sound judgment

Strategic Operations

Drive cross-functional projects that require coordination across engineering, research, recruiting, finance, and operations

Track company priorities, key initiatives, and executive action items to ensure timely execution

Support board meetings, investor updates, leadership offsites, and strategic planning efforts

Research, synthesize information, and prepare presentations, reports, and internal documentation

Recruiting & People Operations

Partner with hiring managers to coordinate executive hiring and other key recruiting efforts

Help deliver an exceptional candidate experience from scheduling through onboarding

Support employee onboarding, internal communications, and company-wide operational initiatives

Assist with planning team events, offsites, and culture-building activities

Company Operations

Identify opportunities to improve internal processes and increase organizational efficiency

Help build scalable operational systems as the company grows

Coordinate with external vendors, partners, and service providers when needed

Take ownership of high-priority special projects that support company growth

Who You Are

Available for a hybrid schedule with 3 days per week onsite at our Palo Alto office

3–7 years of experience as a Chief of Staff, Executive Assistant, Strategic Operations, Program Manager, Management Consultant, or similar role

Bachelor’s degree required

Exceptional organizational and project management skills with the ability to manage multiple priorities simultaneously

Excellent written and verbal communication skills

Highly proactive—you identify problems before they become blockers and consistently follow through

Comfortable operating independently in an ambiguous, fast-changing startup environment

Strong business judgment and the ability to handle confidential information with discretion

Experience supporting founders or senior executives at a high-growth technology company is strongly preferred

Low ego, high output—you enjoy rolling up your sleeves and doing whatever is needed to help the company succeed

Integrity-first: we place a high premium on character, trustworthiness, and sound judgment in this role

About RadixArk

RadixArk is an infrastructure-first company built by engineers who’ve shipped production AI systems, 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 infrastructure investors and partner with Nvidia, Google, AWS, and frontier AI labs. Join us in building infrastructure that gives real leverage back to the AI community.

Compe…