Senior Engineering Manager, Infrastructure

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.

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MZLA Technologies is seeking a hands‑on Sr Manager, Platform Infrastructure to lead the strategy and operations behind the systems that power Thunderbird and MZLA’s global business. You’ll guide a small, distributed team in building and maintaining scalable, secure, and reliable infrastructure supporting both product development and business operations.

As MZLA releases Thunderbird Pro, you’ll play a key role in bringing infrastructure for a new SaaS product across the finish line and helping us scale from our first customers to tens of thousands. You’ll help establish practices that keep our systems resilient against outages and attacks, while shaping how the organization approaches reliability and operational maturity as we grow.

Beyond product delivery, this role is responsible for infrastructure that supports the entire organization, including internal platforms and tools used by engineering, marketing, finance, people operations, analytics, and community teams. Your work will remove friction across the company and ensure that both product and business systems are reliable, secure, and built to scale.

This role blends technical depth with strategic leadership, designing cloud environments, improving automation and CI/CD processes, and ensuring system performance and compliance across all platforms. The ideal candidate thrives in a collaborative environment, balancing hands‑on technical work with long‑term planning and mentorship.

• Design and evolve infrastructure systems to ensure scalability, reliability, and cost efficiency.
• Lead and mentor a distributed infrastructure team, fostering a collaborative and inclusive culture.
• Oversee all cloud environments supporting MZLA’s products and business systems.
• Drive automation, Infrastructure-as-Code, and CI/CD best practices.
• Set and track operational and service level metrics that help teams understand performance and cost patterns.
• Work with community contributors to strengthen our infrastructure and keep systems adaptable.
• Ensure security, observability, and reliability across production and business systems.
• Lead incident management, including on‑call coordination, root‑cause analysis, and post‑incident review.
• Collaborate across teams to align infrastructure decisions with product, compliance, and operational needs.
• Manage infrastructure budgets, vendor relationships, and scaling plans to support organizational growth.

• 15+ years of experience in infrastructure, Dev Ops, or SRE roles, including 4+ years in leadership.
• Expertise in multi‑cloud environments and automation (e.g., Terraform, Pulumi, Ansible, Kubernetes).
• Proven ability to balance hands‑on engineering with team leadership and strategic planning.
• Strong understanding of cloud…