Sr. Administrative Assistant​/Office Manager, Office CEO

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

Boulder, CO

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.

Location: Boulder, CO — onsite, with occasional travel to other company facilities

Reports To:Chief of Staff

Supports: Chief Executive Officer, with support to VPs and C-suite as needed

Status: Full-time, Non-Exempt

Alta is reinventing how the world sources critical minerals — using protein-based chemistry to extract rare earth elements and other essential materials from challenging feed stocks with unmatched selectivity. By dramatically reducing the cost and environmental impact of mineral separation, Alta is making it possible to unlock new sources of supply for 21st-century technologies. As global demand accelerates, securing these materials has become one of the most urgent challenges facing U.S. competitiveness and national security.

Backed by top investors and government partners, Alta is growing fast and hiring mission-driven scientists and engineers to help us scale our platform and transform the future of mining.

Alta is hiring a Sr. Administrative Assistant / Office Manager to support the Office of the CEO. 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.

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.

• 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…