Operations & Administrative Assistant (Part-Time)
Part-time
Mafix
Mafix transforms the world's most abundant rocks and minerals into the next generation of fertilizers. Our products help farmers maintain and improve crop yields while permanently removing CO ₂ from the atmosphere through enhanced rock weathering, delivering a dual return that conventional agricultural products cannot. We produce our mineral fertilizer using spare capacity in cement rotary kilns, making it cost-competitive without building new infrastructure. Applied to soil, it releases plant-available silicon and other nutrients that strengthen crops against climate stress, drought, and pests, while sequestering carbon as the mineral dissolves. With core chemistry published in Nature, our pre-seed funding secured, and key partnerships in place, we are scaling fast: moving from pilot production to a 1,000-tonne commercial run in 2027. We are looking for team members excited to unlock the power of abundant rocks towards a climate positive and food abundant future! Position Details: We are looking for a reliable, resourceful, and detail-oriented Administrative Assistant to keep our Seattle office and lab running smoothly. This is a hands-on, in-person role supporting day-to-day operations for a small, fast-moving team. You'll be the person who makes sure supplies are stocked, shipments are received, vendors are paid, and the small things that keep a startup humming don't slip through the cracks. This role is part-time (~15-20 hours/week with room to expand as the team grows, flexible scheduling), onsite in Seattle, WA, and reports to CEO. Responsibilities:
- Manage office and lab logistics: order supplies and equipment, receive and log shipments, and coordinate with vendors.
- Support facilities upkeep and coordinate with building management and service providers.
- Assist with bookkeeping tasks such as expense tracking, invoice processing, and receipt organization.
- Help schedule meetings, coordinate travel, and support team onboarding.
- Keep records, files, and shared systems organized and up to date.
- Pitch in wherever needed to keep a growing team running efficiently.
- 2+ years of administrative, operations, or office coordination experience, ideally in a startup, lab, or small-business setting.
- Highly organized and self-directed, with strong attention to detail and follow-through.
- Comfortable juggling varied tasks and shifting priorities.
- Proficient with common office and productivity tools (email, calendars, spreadsheets, document sharing).
- Reliable, discreet, and able to work independently in person in Seattle, WA.
- Experience with basic bookkeeping or procurement a plus.
- Onsite in Seattle, WA
- Salary: competitive hourly salary
- Start date: ASAP
Vacancy posted 2 days ago
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