Office & Workplace Operations Manager

About Mariana Minerals

Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making. Join us as we build the future of mining and minerals refining.

Role Overview

We’re looking for a proactive, detail-oriented Office & Workplace Operations Manager to own the daily operations of our offices and create consistent, high-quality employee experience across multiple locations. From managing facilities and vendors to fostering a welcoming environment, you’ll be the go-to person for everything that keeps our workplace running smoothly and our teams feeling supported. You’ll work on a blend of office management, workplace experience, event planning, lightweight administrative support and culture-building.

This role is perfect for someone who thrives in a fast-paced environment, enjoys both hands-on tasks and big-picture thinking, and is excited to shape the future of how our workplaces feel and function.

What You’ll Do

Office Operations & Facilities

• Keep the office running smoothly: order supplies, purchase and stock snacks, and maintain general upkeep and tidiness of the space.

• Act as the first point of contact for any office or building needs, liaising with property management, vendors, and contractors.

• Support new hire desk setups, tech coordination, and seating plans.

• Serve as the first point of contact for employees and visitors, ensuring a professional, welcoming environment.

Workplace Experience

• Ensure office spaces are clean, organized, and tech-enabled for meetings and collaboration

• Develop and implement standards that create a cohesive workplace experience across all locations.

• Create an inclusive, high-functioning workplace that supports diverse working styles and teams, including hybrid and remote employees when applicable.

• Support internal events, celebrations, and culture-building activities.

• Manage budgets related to office expenses and workplace initiatives.

• Contribute to workplace safety initiatives and support emergency preparedness protocols.

What You’ll Bring:

• 3 years experience in office management, workplace operations, or a similar role (startup or fast-growth environment a plus).

• Strong organizational skills and ability to manage multiple priorities.

• Excellent communication and interpersonal skills — approachable, professional, and solution-oriented.

• Comfort with productivity tools (Outlook, Teams, or equivalents).

• A proactive, service-minded attitude and a passion for creating great employee experiences.

Bonus Points for:

• Experience managing multiple office locations.

• Background in event planning, hospitality, or facilities coordination.

• Familiarity with workplace technology systems (badge access, room booking, AV equipment).