Mozilla, the nonprofit-backed company behind Firefox, is seeking a Sr Staff Machine Learning Engineer (GenAI) to lead the design and integration of advanced machine learning models into Firefox. This is a high-impact role where you’ll shape strategy, mentor engineers, and deliver AI-powered user experiences while keeping privacy, safety, and transparency at the core.
Why Mozilla?
For 25 years, Mozilla has stood for an internet that serves people, not corporations. With more than 225M monthly users, we’re tackling challenges in AI, privacy, security, and digital health—always mission-first and open-source driven. As a wholly owned subsidiary of the Mozilla Foundation, our work is guided only by the goal of making the internet better for everyone.
What You’ll Do
- Lead the development and deployment of LLMs and multimodal AI models inside Firefox
- Drive strategic initiatives where machine learning improves the browser experience
- Collaborate across product, design, and engineering teams to launch AI features at scale
- Stay ahead of AI/ML trends and translate them into innovative product opportunities
- Champion responsible AI practices that prioritize user needs, transparency, and safety
- Mentor engineers, provide technical leadership, and foster team-wide upskilling
- Shape product strategy and ensure alignment across multiple teams
What You’ll Bring
- 8+ years of professional ML engineering experience
- Proven success in shipping AI/ML models for consumer-facing products
- Deep expertise in LLMs, multimodal models, NLP, reinforcement learning, or deep learning
- Strong leadership track record across multiple teams and projects
- Hands-on experience with open-source AI tools and cloud platforms (AWS, GCP, Azure)
- Experience with large-scale A/B testing, responsible AI, and transparent algorithms
- Pragmatic approach to balancing innovation with safeguards and deadlines
Bonus Points
- Experience with on-device ML models
- Contributions to open-source projects
- Familiarity with browser architecture
Compensation
- Tier 1 US Locations: $216,000 – $288,000
- Tier 2 US Locations: $199,000 – $265,000
- Tier 3 US Locations: $184,000 – $245,000
(Base pay varies by location and experience. Total comp may include bonuses and stock options.)
Benefits
- Generous performance-based bonus plans
- Rich medical, dental, and vision coverage
- Retirement contributions with 100% immediate vesting
- Paid parental leave, quarterly wellness days, and well-being stipend
- Professional development budget + home office stipend
- Global holidays plus a day off for your birthday
- Employee referral bonuses and additional country-specific perks
Why It Matters
This is your chance to shape the role of AI in the world’s most trusted open-source browser. You’ll define how millions of users experience AI while ensuring Mozilla’s values of privacy, transparency, and fairness remain central.
Happy Hunting,
~Two Chicks…