Administrative Assistant | San Francisco, CA

Finance and Administration
California, United States
May 13, 2026
$70,000 - $95,000 / year
Full-time
Apply Now

Job Description

Company: Mariana Minerals
Location: San Francisco, California, United States (On-site)
Category: Finance and Administration
Job Type: Full-time
Experience Level: Entry-Level
Salary: $70,000 – $95,000 USD/year

Job Summary
Mariana Minerals is seeking a highly organized and proactive Administrative Assistant to support day-to-day administrative operations across multiple locations.

This role focuses on calendar and travel coordination, expense management, on-site office support, executive support backup, and administrative operations in a fast-paced critical minerals company.

Key Responsibilities

  • Assist with scheduling meetings, managing calendars, and coordinating internal and external appointments
  • Help prepare meeting materials, agendas, and meeting notes as needed
  • Support coordination of cross-functional meetings and company events
  • Book and manage domestic and international travel, including flights, hotels, and ground transportation
  • Handle last-minute travel changes and troubleshoot logistical issues
  • Prepare and submit expense reports accurately and on time
  • Reconcile receipts and assist with tracking budgets or spending reports
  • Provide in-office support across multiple sites as needed
  • Coordinate office supplies, deliveries, and facilities-related requests
  • Assist with visitor management, on-site meeting logistics, internal events, and team off-sites
  • Serve as backup to the Executive Assistant during absences or high-volume periods
  • Assist with special projects and ad hoc administrative requests

Qualifications
– 1–3 years of administrative or office support experience preferred
– Experience with expense management and calendar systems preferred

  • Strong organizational skills and attention to detail
  • Excellent written and verbal communication skills
  • Proficiency in Microsoft Office
  • Ability to handle confidential information with discretion
  • Strong time management and prioritization skills
  • Problem-solving mindset
  • Professional and service-oriented approach
  • Adaptability in a fast-paced environment
  • Positive attitude and team-oriented mindset
  • Ability to manage competing priorities across multiple locations

What We Can Offer You

  • Opportunity to work with a mission-driven critical minerals company
  • Equity offer as part of the compensation package
  • Opportunity to grow within operations or executive support functions
  • Exposure to advanced software, automation, and data-driven decision-making
  • Collaborative culture focused on ownership, automation, and knowledge sharing
  • Opportunity to support teams reshaping responsible mineral sourcing and supply

Why This Role Matters
This role is important because it helps keep Mariana Minerals’ administrative operations, executive support, travel logistics, office coordination, and internal communication running smoothly across multiple locations.

Apply
👉 Apply online: https://jobs.ashbyhq.com/marianaminerals/f81d3007-ce7d-4072-9f7d-653b11ca2048

⚠️ Disclaimer
This job is shared for informational purposes. WeMineUp is not affiliated with the hiring company. Please apply through the official company process.

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