Executive Assistant to COO

Position Title: Executive Assistant to the COO

Location: Remote

About Us As an emerging leader in nuclear engineering, our startup is developing revolutionary reactor technology to secure safe and abundant energy for future generations. We are seeking a highly motivated EA to join our dynamic team.

Job Summary The Executive Assistant (EA) to the Chief Operating Officer serves as a critical operational partner to the COO, enabling executive effectiveness across a broad portfolio that includes Quality, Engineering, Licensing, and Human Resources. This is a high-trust, high-impact role for a detail-oriented professional who thrives in a fast-paced, mission-driven environment.

The ideal candidate brings polished administrative expertise, composure, strong written communication skills, with a high degree of intellectual curiosity and initiative. This position offers a unique opportunity to contribute to one of the most consequential technology sectors of our time.

Key Responsibilities

Executive & Calendar Management

• Own and manage the COO's calendar, proactively resolving scheduling conflicts and prioritizing time against strategic objectives
• Coordinate internal and external meetings, ensuring agendas, materials, and attendees are prepared in advance
• Serve as the primary point of contact and gatekeeper for the COO's schedule and communications

Travel & Logistics

• Arrange complex domestic and international travel including flights, accommodations, ground transportation, and itineraries
• Anticipate and address travel disruptions with minimal oversight
• Assist with event, speaker and conference preparation

Expense Management & Reconciliation

• Manage the COO's expense reporting, ensuring timely and accurate submission and reconciliation
• Track departmental expenditures and flag budget variances to the COO as appropriate

Communications & Technical Editing

• Draft, review, and appropriately administer correspondence, presentations, reports, and technical documents on behalf of the COO
• Under guidance of the COO, ensure accuracy, clarity, and professional quality across written materials
• Synthesize information from cross-functional teams, Quality, Engineering, Licensing, and HR, into concise briefings and summaries

Operational Support

• Support the planning and coordination of team meetings, offsites, and operational reviews
• Maintain organized filing systems, document libraries, and action item trackers
• Assist with onboarding coordination and HR administrative tasks as directed
• Liaise with internal departments and external stakeholders on behalf of the COO

Key Qualifications

• 6+ years of experience as an Executive Assistant, Business Manager or other relevant role directly supporting C-suite leadership
• Exceptional organizational skills with the ability to manage multiple priorities simultaneously
• Strong written and verbal communication skills; ability to produce polished written work independently
• Proficiency in Microsoft Office Suite (Outlook, Word, Excel, PowerPoint) and travel/expense platforms
• Proficiency with Sharepoint and Dashboard creation/maintenance
• Demonstrated discretion and sound judgment in handling confidential and sensitive information
• Comfort operating in ambiguous, fast-moving environments with limited process infrastructure
• US Citizen or Permanent Resident status required

Preferred

• Experience supporting operations in a technical, regulated, or highly complex industry (aerospace, defense, energy, biotech, or similar)
• Familiarity with technical documentation, regulatory correspondence, or quality management systems
• Proficiency with PowerBI or similar platforms

Fissionaire’s technology is subject to U.S. export control regulations, which require the company to review applicants’ eligibility based on their citizenship or residency status. As part of the application process, candidates will be asked to indicate whether they are a U.S. citizen, green card, lawful permanent resident, asylee, or refugee resident to support this review. Because government authorization timelines can vary, Fissionaire is unable to consider alternate resident statuses where required approvals may not be obtainable within a timeframe that meets business needs.

What We Offer:

• Competitive salary with equity options
• Comprehensive benefits, holiday and PTO schedule
• Opportunity to work with a groundbreaking nuclear startup

Fissionaire is an Equal Opportunity Employer that does not discriminate on the basis of actual or perceived race, colour, creed, religion, national origin, ancestry, citizenship status, age, sex or gender (including pregnancy, childbirth, pregnancy-related conditions, and lactation), gender identity or expression (including transgender status), sexual orientation, marital status, family or relationship structure, military service and veteran status, physical or mental disability, genetic information, gender identity, or any other characteristic protected by applicable federal, state, or local laws and ordinances. Fissionaire’s management team is dedicated to this policy with respect to recruitment, hiring, placement, promotion, transfer, training, compensation, benefits, employee activities, access to facilities and programs, and general treatment during employment.

Benefits:

• Dental insurance
• Health insurance
• Life insurance
• Paid time off
• Vision insurance

Education:

• High school or equivalent (Required)

Work Location: Remote