Staff Machine Learning Engineer, Gen AI

Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser, and Pocket, a service for keeping up with the best content online. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people.

The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with 60,000+ volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms.

About this team and role:

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 Staff Machine Learning Engineer to help us develop and grow new Generative AI driven products and tools. You will play a key role in enabling safe and healthy machine learning and Generative AI driven experiences in Firefox.

What is a Staff Engineer at Mozilla?

A Staff Engineer is the next level from a Senior Engineer. At Mozilla this role can vary but typically a Staff Engineer is a domain expert who leads others within a single team to tackle multi-month projects. Tasks that may be initially ambiguous or require significant planning and require them to influence or direct the work of several engineers. They sequence deliverables and manage risks in their team's projects, provide feedback on our strategy and goals affecting the team, and turn our strategy into action for their team members. Staff Engineers mentor others by stewarding some responsibilities to more junior and senior engineers so they can take on new ones. They collaborate with management on building team consensus and providing direction. Staff Engineers identify gaps and opportunities for improvement to enable a culture of inclusion and allyship, at all levels of the organization.

What you’ll do...

• Lead the design, development, and integration of Generative AI solutions in Firefox, collaborating cross functionally with product management, full stack engineering and design.
• Build, fine-tune and evaluate LLMs and GenAI models for use cases on the web and mobile Firefox product experiences.
• Implement robust validation and testing procedures to ensure the developed models' generalizability and reliability.
• Continuously monitor and optimize deployed models for performance and efficiency.

What You Bring…

• 6+ years experience as a Machine Learning engineer with working knowledge of Python and experience with deep learning frameworks such as Pytorch, TensorFlow, JAX or MXNet.
• Experience with fine-tuning and evaluating LLM models.
• Experience working in machine learning tooling and infrastructure for training, deploying and inference of models.
• Analytical ability to apply and solve sophisticated machine learning problems spanning web and mobile experiences.
• Strong problem-solving skills and ability to communicate complex concepts to technical and non-technical stakeholders.
• Experience with design of experiments, survey design, and large-scale AB testing.
• Experience working collaboratively with product managers, project managers, and/or other non-engineering teams.
• Good written and verbal English communication skills and have participated effectively on a distributed team.

Commitment to our values:

• Welcoming differences
• Being relationship-minded
• Practicing responsible participation
• Having grit

Bonus Points

• Knowledge of and experience with using LLM solutions across different cloud providers.
• You have previously successfully contributed to an open source project.
• Track record of not only building one, but multiple projects deployed with an active user base.
• Experience with responsible AI, transparent algorithms, and putting users’ needs first.
• Excellent communication skills, both in written and presentation form. You have the ability to quickly distill sophisticated topics into concepts that are tailored for your target audience.
• You are a lifelong learner, and continue to refine and improve your skills when you see an opportunity to do so.
• Solid understanding of at least one of the following programming languages: Python, Java, C++.
• Experience with the browser extensions architecture or ecosystem.
• Experience working in open source environments.

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).

About Mozilla

Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online.

Commitment to diversity, equity, inclusion, and belonging

Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions.

We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at to request accommodation.