Senior Machine Learning Engineer, Applied AI Modeling

🕒 June 19

🇺🇸 United States – Remote

💵 $139k - $218k / year

⏰ Full Time

🟠 Senior

🤖 Machine Learning Engineer

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Mozilla

WebsiteLinkedInAll Job Openings

501 - 1000 employees

Founded 1998

👥 B2C

🔒 Cybersecurity

B2C • Cybersecurity • Software

Mozilla is a non-profit organization dedicated to promoting an open and accessible internet. They are the makers of the popular Firefox browser, which emphasizes user privacy, speed, and control. Mozilla also offers a range of products that focus on internet security and privacy, including Mozilla VPN, Firefox Relay, and Mozilla Monitor. Additionally, the organization is involved in open-source projects, AI innovation, and advocating for digital rights. Mozilla aims to empower users with trustworthy technology and policies that protect privacy, support open-source AI development, and foster accountability for tech companies.

📋 Description

• Develop and fine-tune large language models (LLMs) for intelligent, safe, and responsive browser interactions. • Apply retrieval-augmented generation (RAG), summarization, classification, and intent modeling techniques in real-world browser workflows. • Use modern ML tooling (e.g., Hugging Face, LangChain, Weights & Biases, Ray, or similar) to support end-to-end model development, including experimentation, evaluation, and rollout. • Collaborate closely with product and engineering partners to design, iterate, and launch features that align with user needs and Mozilla’s values. • Design and implement experiments to test model behavior in production, analyze results, and iterate based on findings. • Document and share your work, participating in code reviews and team design discussions.

🎯 Requirements

• 4+ years of experience in applied machine learning, with a focus on natural language processing or generative AI • Hands-on experience fine-tuning and evaluating LLMs using modern tools and open-source libraries. • Strong understanding of prompt engineering, embedding-based retrieval, and evaluation strategies for generative applications. • Experience using ML tooling to lead the end-to-end lifecycle of model development—from data exploration to deployment-ready artifacts. • Track record of building user-facing AI features, especially where privacy, latency, and usability are critical. • Clear communication skills and ability to collaborate with multi-functional partners on a distributed team. • Commitment to our values: Welcoming differences, Being relationship-minded, Practicing responsible participation, Having grit

🏖️ Benefits

• 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)