Senior Machine Learning Engineer, Applied AI Modeling

Mozilla

Remote regions

US

Benefits

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About the Team & Role:

  • The Firefox team is embedding modern AI and LLM-driven features directly into the browser.
  • This role focuses on applied AI, including prototyping and deploying generative AI experiences.
  • Work collaboratively with engineering, design, and product to bring capabilities to life.

What You’ll Do:

  • Develop and fine-tune LLMs for intelligent and responsive browser interactions.
  • Use modern ML tooling like Hugging Face, LangChain, and Weights & Biases for end-to-end model development.
  • Design experiments to test model behavior in production and iterate based on findings.

What You Bring:

  • 4+ years experience in applied ML, focusing on NLP or generative AI.
  • Hands-on experience fine-tuning and evaluating LLMs with open-source libraries.
  • Track record of building user-facing AI features with privacy and latency considerations.

Mozilla

Mozilla Corporation is a non-profit-backed technology company that makes Firefox and Pocket, with a mission to reclaim an internet built for people. With over 225 million monthly users and a focus on AI, security, and open-source software, Mozillians work in a collaborative, mission-driven culture.

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