Sr. Administrative Assistant / Office Manager, Office of the CEO

Alta Resource Technologies•Boulder, CO

2d•Onsite

About The Position

Alta Resource Technologies (Alta) is a next generation mining company that uses synthetic biology to separate critical minerals from conventional and unconventional resources, including e-waste. Founded in 2023, the company is expanding its team in Boulder, CO. The exponential growth of new tech industries, as well as the information technology sector, are driving historic growth in mineral demand and stressing existing supply streams. Meeting new demand, diversifying the supply chain, and producing minerals in a more sustainable manner requires the rapid development, deployment and scaling of new technologies. This mineral challenge represents a historic opportunity for technology development and value creation. Alta is proud to be at the vanguard of this mega trend. This role is the operational backbone of Alta’s executive team — owning the scheduling, travel, workplace, and coordination work that keeps a fast-moving leadership group running, and doing it well enough that leadership stops thinking about it. The position exists because Alta is scaling. At 39 employees today and growing past 50 across multiple facilities, the volume of executive administration and workplace operations has outgrown what can be absorbed alongside strategic work. This role takes ownership of that volume so that the Office of the CEO can focus on planning, execution, and organizational infrastructure. This is a high-trust, high-visibility position. The person in this role sees calendars, board logistics, personnel information, and financial documents before almost anyone else does. Discretion is not a preferred quality here; it is the job.

Requirements

Associate’s or Bachelor’s degree, or equivalent experience
Three to five years of administrative, executive support, or office operations experience, ideally in a startup or high-growth environment
Demonstrated ability to manage complex calendars and competing priorities for senior stakeholders
Proven discretion with confidential personnel, financial, and board information
Strong written and verbal communication, including with external partners and investors
Highly organized, with a bias toward closing loops and following through without reminders
Drives tasks and projects to full completion, following up repeatedly and closing gaps in information, timing, or direction without being asked twice
Comfortable working independently and confidently making judgment calls in ambiguous situations
Proficiency with Google Workspace or Microsoft 365, video conferencing, and expense management tools
Availability outside standard hours as needed, including evenings or weekends for special events, VIP or investor visits, and time-sensitive requests from the CEO or President
U.S. citizenship and valid passport required

Nice To Haves

3-5 years in Office Manager, Administrative Assistant, Executive Assistant, or similar role
Associate’s or Bachelor’s Degree
Experience supporting a C-level executive or executive team
Experience coordinating board meetings, investor visits, or company events
Familiarity with ATS platforms, HRIS systems, or onboarding coordination
Experience in a multi-site organization
Exposure to project or execution tracking tools such as Jira, Asana, or Notion

Responsibilities

Own calendar management for the CEO, and for VPs and C-suite leaders as needed
Schedule and reschedule against shifting priorities, resolving conflicts without escalating each one
Protect focus time and enforce meeting standards set by the Chief of Staff
Coordinate complex multi-party meetings across functions, facilities, and external stakeholders
Manage the logistics of recurring leadership meetings, including room, materials distribution, and remote access
Book and manage domestic and international travel for the executive team, including itineraries and contingency planning
Administer vendor relationships for office services: onboarding, invoicing, renewals, and issue resolution
Maintain purchasing and supply processes across facilities within approved budgets
Prepare and submit expense reports; track receipts, reconcile against policy, and follow through to reimbursement
Assemble, format, and distribute meeting materials and agendas prepared by the Chief of Staff
Capture notes and action items in leadership and cross-functional meetings, and route them into the company’s tracking system
Follow up on outstanding action items and flag items at risk of slipping
Draft and distribute internal communications and announcements as directed
Serve as a professional first point of contact for external visitors, partners, and investors
Own day-to-day office operations at the Boulder site: supplies, equipment, facilities requests, and workspace readiness
Coordinate with building management, service providers, and IS on workplace issues
Support the people-facing side of new site readiness alongside the SVP of Operations, including workspace setup and supply logistics
Maintain office procedures and documentation so processes are repeatable rather than person dependent
Partner closely with the Facilities Ops Manager to stay current on building operations and maintenance activity
Schedule interviews and coordinate candidate logistics with hiring managers and the external HR partner
Execute new-hire onboarding logistics: workspace, equipment, access requests, first-week scheduling, and welcome materials
Maintain HR and compliance documentation and personnel records, handling confidential information with strict discretion
Support employee programs and recognition activities
Plan and execute company events, team gatherings, and all-hands meetings across sites
Coordinate logistics for board meetings and investor visits, including catering, materials, and on site arrangements
Contribute to a consistent employee experience across all Alta locations