Executive Assistant

About the Company

SirenOpt helps manufacturers make better, safer, and more reliable micro- and nano-materials. Using a novel combination of cold atmospheric plasma, physics-informed machine learning, and predictive analytics, SirenOpt creates unique, real-time fingerprints that capture material signals to provide unprecedented visibility into material behavior during production.

Responsibilities

• Manage complex calendars and scheduling for key company leaders across time zones
• Arrange domestic and international travel, including flights, hotels, and ground transportation
• Support executive communications by drafting emails, meeting agendas, and recaps
• Coordinate meetings and events such as customer visits and internal team offsites
• Manage expense reporting and reconciliation using Expensify and Brex
• Maintain shared documents and records in Microsoft 365 and Confluence
• Handle general office and corporate administrative functions including vendor coordination and onboarding logistics

Requirements

• Bachelor’s degree or equivalent
• 3–6 years of experience in an administrative or executive assistant role
• Experience in a startup or fast-moving environment
• Proficiency with Microsoft 365 (Outlook, Word, Excel, Teams)
• Strong organizational skills and attention to detail
• Ability to handle sensitive information with discretion

Preferred Qualifications

• Experience supporting multiple principals simultaneously
• Familiarity with Confluence, Expensify, Brex, and HubSpot