Senior Administrative Assistant — Executive Support

CesiumAstro, Inc.; Austin (TX); Hybrid; USD 60,000 - 90,000; Full time

Benefits offered by this job

Stock options

Health insurance

Dental insurance

Vision insurance

HSA

FSA

Life insurance

Disability insurance

Retirement plans

Job summary

CesiumAstro, Inc. seeks a highly organized Senior Administrative Assistant to support day‑to‑day operations, act as the face of the company to employees, visitors, and vendors, and manage a range of administrative tasks across multiple teams.

The ideal candidate will have strong communication skills, meticulous attention to detail, and the ability to work independently while collaborating with cross‑functional colleagues.

Qualifications

• 7+ years office administration and/or receptionist experience is required.
• Associate’s degree required; bachelor’s degree preferred.
• Outstanding organization skills with strong attention to detail and critical thinking.
• Experience managing complex travel arrangements and calendars for meetings.
• Proficiency in Microsoft Office suite (Word, Excel, PowerPoint, Outlook).
• Strong telephone/communication and interpersonal skills.
• Positive, flexible attitude with strong customer orientation.
• Ability to work in a team and build strong working relationships.

Responsibilities

• Oversee and coordinate day-to-day office operations for efficiency.
• Support senior leaders and employees across multiple teams.
• Greet visitors and set up conference rooms for meetings.
• Schedule meetings, manage calendars, and book travel.
• Order, organize, and maintain inventory of office supplies and drinks/snacks.
• Coordinate onsite catering for lunches and events.
• Work with vendors and team members on administrative tasks and orders.
• Assist with coordination of contractors and service providers for facility work.
• Complete expense reports for designated management members.

Skills

Office administration

Calendar management

Microsoft Office

Communication

Team player

Attention to detail

Education

Associate degree

Bachelor's degree

Tools

Microsoft Word

Microsoft Excel

PowerPoint

Outlook

Job description

CesiumAstro, Inc. seeks a highly organized Senior Administrative Assistant to support day‑to‑day operations, act as the face of the company to employees, visitors, and vendors, and manage a range of administrative tasks across multiple teams.

The ideal candidate will have strong communication skills, meticulous attention to detail, and the ability to work independently while collaborating with cross‑functional colleagues.