Senior Staff Machine Learning Engineer, Gen AI

The Firefox team is a community of engineers who care deeply about delivering the fastest, friendliest, most usable browser possible. We are responsible for making the things you see in the browser work securely, quickly, and well! We are looking for a Principal AI Engineer to help us develop and grow new machine learning driven products and tools. You will play a key role in enabling safe and healthy machine learning and AI driven experiences in Firefox.

Principal Engineers are industry experts in their domain. They help define our product strategy and goals affecting multiple teams and turn our strategy into coordinated action for those teams. They mentor others through  transfer of responsibilities to more junior engineers so they can take on new ones, while collaborating with management on building team consensus and providing direction.

What you’ll do:

• Tackle large open-ended problems and drive them to completion, collaborating with other designers and engineers to make the web a better place.
• Identify strategic opportunities where machine learning models improve the experience in Firefox.
• Lead the design, development, and integration of innovative machine learning models in Firefox, collaborating cross functionally with product management, full stack engineering and design.
• Stay up-to-date with the latest advancements in machine learning, natural language processing, and related fields to ensure our methodologies remain innovative and relevant.
• Lead by example to upskill the team on AI and generate thought leadership.

What you’ll bring:

• 8+ years experience as an Engineer in machine learning or artificial intelligence.
• Deep knowledge of core web technologies and modern machine learning concepts like  deep learning, natural language processing, large language models, reinforcement learning with expertise in one or more areas.
• Identify difficult problems that are important for the organization, collaborate across teams and the organization to find the best strategy to resolve.
• Ability to quickly analyze and solve sophisticated software development problems spanning multiple components, sometimes outside your area of expertise.
• Proven track record of technical leadership across multiple teams, shipping AI products showing a high degree of collaboration, flexibility, and respect for diverse perspectives
• Strong problem-solving skills and ability to communicate complex concepts to technical and non-technical stakeholders.
• Passion for responsible AI, transparent algorithms, and putting users’ needs first.
• Experience with analyzing large-scale dataset utilizing statistical and machine learning tools
• Experience with design of experiments, survey design, and large-scale AB testing
• You’re pragmatic about how to move things forward in specific timeframes including trade-offs and safeguards when implementing new functionality.
• Excellent written and verbal English communication skills and have participated effectively on a distributed team

Bonus Points

• You have previously successfully contributed to an open source project.
• Experience with the browser extensions architecture or ecosystem.

We value a variety of voices within our team and at Mozilla. You don’t need to check every box on this list to apply.

What you’ll get:

• Generous performance-based bonus plans to all eligible employees – we share in our success as one team
• Rich medical, dental, and vision coverage
• Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)
• Quarterly all-company wellness days where everyone takes a pause together
• 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
• Other benefits (life/AD&D, disability, EAP, etc. – varies by country)