New Products Principal Engineer

Job Description

Mozilla Corporation is seeking a Principal Software Engineer to join their New Products team, which is focused on building a browser-automation stack for AI agents. This role involves setting the technical vision, architecting the platform, and writing production code. The Principal Engineer will guide a small team, deliver core libraries, services, and tooling, and shape green-field products.What this role involves:

• Defining and communicating the technical roadmap.
• Writing high-performance code in languages such as Go, Ruby on Rails, and TypeScript.
• Designing distributed, fault-tolerant services and developer-facing SDKs/APIs.
• Owning cloud infrastructure, CI/CD pipelines, security, and observability.
• Growing, mentoring, and inspiring a world-class engineering team.
• Collaborating with product, design, and developer-relations teams.
• Translating complex technical trade-offs for stakeholders.

Requirements:

• 10+ years of software engineering experience.
• Expert-level proficiency in at least two of: Go, Ruby (Rails), Python or TypeScript/JavaScript.
• Experience architecting and shipping complex, high-throughput systems.
• Understanding of browser internals and automation frameworks.
• Experience with AI/ML workflows or agent frameworks.
• Strong focus on code quality and operational excellence.
• Exceptional communication skills.

What Mozilla offers:

• Generous performance-based bonus plans.
• Rich medical, dental, and vision coverage.
• Generous retirement contributions.
• Quarterly all-company wellness days.
• Country-specific holidays plus a day off for your birthday.
• One-time home-office stipend.
• Annual professional development budget.
• Quarterly well-being stipend.
• Considerable paid parental leave.
• Employee referral bonus program.