Senior Executive Assistant

MZLA Technologies Corporation (MZLA) is a wholly owned, for-profit subsidiary of the Mozilla Foundation and home to Thunderbird, our flagship open-source email and productivity platform empowering more than 20 million people around the world. While part of the Mozilla portfolio of companies, MZLA operates independently in both identity and organizational structure from the Mozilla Foundation and Mozilla Corporation.

Everything we build at MZLA is open source, developed transparently and in collaboration with a global community of contributors. This open approach shapes not only our products but also how we work: collaboratively, inclusively, and with a shared commitment to building technology that puts users first. We believe privacy and productivity should coexist, and that people deserve powerful digital tools without surrendering control of their data.

MZLA is a small but growing team of 50+ people distributed across seven countries. As we evolve Thunderbird from a single application into a suite of privacy-respecting productivity tools, we’re introducing new products and services that remain independent of big tech ecosystems. Our unique revenue model combines community donations that keep Thunderbird freely available with subscriptions for new cloud-based services, allowing us to grow and innovate while remaining independent and true to our values.

To learn more, visit www.thunderbird.net

The Opportunity:

As a Senior Executive Assistant, you will provide high-level, proactive support to the CEO and COO, anticipating needs, prioritizing effectively, and extending the impact and efficiency of executive leadership across MZLA. This role sits at the center of executive operations, acting as a connective layer across priorities, people, and information to ensure complex initiatives move forward with clarity and momentum.

As the sole Executive Assistant in the organization, you will play a critical role in enabling smooth, coordinated operations while representing executive leadership both internally and externally. You will partner closely with HR, Finance, Legal, the Board, and cross-functional teams across a global, remote-first environment. In addition to managing executive scheduling and logistics, you will support projects, prepare materials and briefings, coordinate governance activities, and drive follow-through on key initiatives.

This role is ideal for someone who thrives in a fast-paced, dynamic organization and brings diplomacy, composure, strong judgment, and a solutions-oriented mindset. You are highly organized, an effective listener and communicator, and comfortable navigating complex or sensitive situations with professionalism and discretion. Above all, you take pride in helping leaders and organizations operate at their highest level of effectiveness.

This is a full-time, remote position working with colleagues across multiple regions and time zones. The role requires consistent overlap with Eastern and Central Time working hours, and we strongly prefer candidates located in or aligned with those time zones.

What you’ll do: 

• Act as a connective layer across executive priorities, teams, and information, helping ensure initiatives move forward with clarity, alignment, and follow-through.
• Own and manage complex administrative and operational support, including executive calendar strategy, multi–time zone scheduling, domestic and international travel coordination, expense reporting, and executive logistics.
• &l