Senior Staff Machine Learning Engineer, Mozilla

Gen AI


Pay dependent on location. Plus Bonus

Senior and Expert level
Remote in US

Designs, builds, and distributes internet software

Open for applications


Designs, builds, and distributes internet software

1001+ employees

B2CEnterpriseInternal toolsPrivacySaaS

Open for applications


Pay dependent on location. Plus Bonus

Senior and Expert level
Remote in US

1001+ employees

B2CEnterpriseInternal toolsPrivacySaaS

Company mission

To make sure that the internet remains accessible, open, and transparent to everyone.


Who you are

  • 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


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

What the job involves

  • 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
  • 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

Otta's take

Theo Margolius headshot

Theo Margolius

COO of Otta

Mozilla creates and manages a range of free-to-use software products. Their most well-known product is Firefox, the fourth most popular internet browser in the world. Mozilla is a not-for-profit with a focus on promoting online privacy. The company has a published manifesto outlining its commitment to keeping a balance between commercial profit and public benefit.

The companies other products include Bugzilla, a bug management platform, and Pocket, an award-winning digital content filing service. In direct odds with Google, Mozilla has recently launched a new product Mozilla VPN. The VPN or virtual private network enables users to browse the internet without being tracked. Companies such as Google rely on tracking user behavior online to target them with advertising.

Mozilla was also instrumental in creating the programming language Rust, which is admired for its brevity. Rust uses roughly half the amount of code as C++ to produce the same results.


Led by a woman

Few candidates hear
back within 2 weeks

12% employee growth in 12 months


Funding (last 2 of 3 rounds)

Apr 2018



Jan 2005



Total funding: $3.5m

Company benefits

  • Health, Dental, and Vision Insurance
  • Life Insurance + Accidental Death & Dismemberment
  • Short-Term Disability and Long-Term Disability Insurance
  • Employee Assistance Program (EAP)
  • Retirement Plan contributions
  • 20 Paid Time Off days per year (prorated) + your birthday
  • Company Holidays + Shutdown
  • Wellness budget
  • Reimbursement for professional development (up to $3,000/year)
  • Industry-leading paid parental leave (up to 26 weeks of fully paid leave for childbearing parents and up to 12 weeks for non-childbearing parents)
  • Flexible work environment (nearly half of Mozillians work remotely)
  • A work setup including the latest hardware and software of your choice

Company values

  • We welcome differences
  • We are relationship-minded
  • We practice responsible participation
  • We have grit

Company HQ

Rincon Hill, San Francisco, CA


Mitchell Baker

(CEO & Chairwoman)

Mitchell worked as a lawyer and at Netscape Communications before co-founding Mozilla in 2003. They have served as Chairwoman of Mozilla Foundation since then, and CEO as of April 2020.

Share this job

View 75 more jobs at Mozilla