Senior Frontend Software Engineer, Mozilla

€53-77k

Offers generous performance-based bonus plans to all eligible employees

React

TypeScript

Redux

JavaScript

Jest

Senior and Expert level

Remote from France

Designs, builds, and distributes internet software

Be an early applicant

Designs, builds, and distributes internet software

1001+ employees

B2CEnterpriseInternal toolsPrivacySaaS

Be an early applicant

€53-77k

Offers generous performance-based bonus plans to all eligible employees

React

TypeScript

Redux

JavaScript

Jest

Senior and Expert level

Remote from France

1001+ employees

B2CEnterpriseInternal toolsPrivacySaaS

Company mission

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

Job

Company

Role

Who you are

5+ years of experience in JavaScript/TypeScript, React, Redux, and browser-based UI development
A strong background in building complex, interactive UIs that manage large data sets efficiently
Knowledge of profiling, performance tooling, and testing
Knowledge of frontend testing frameworks (e.g., Jest, React Testing Library) and best practices in maintainable UI codebases
Strong and respectful communication skills and ability to collaborate across engineering teams
Experience working with performance visualization is a plus
Familiarity with the Firefox Profiler or Chrome DevTools is a plus
Commitment to our values:
Welcoming differences
Being relationship-minded
Practicing responsible participation
Having grit

What the job involves

The Performance Tools team builds frameworks and tools that help engineers measure and improve performance across Mozilla products
We’re a distributed team based in North America and Europe, supporting both internal Mozilla engineers and the broader web developer community through tools like the Firefox Profiler
In this role, you will work on the user interface of the Firefox Profiler
This includes implementing interactive performance visualizations, handling large-scale performance data efficiently in the browser, and improving usability for engineers across Mozilla
You will collaborate with systems engineers, browser developers, and other teams working on performance
Design and develop modern, interactive UI components for the Firefox Profiler using TypeScript, React, Redux, and related web technologies
Build high-performance, scalable, accessible, and maintainable user interfaces that visualize complex performance data
Engage with other Firefox engineers to help them learn how to use our tools efficiently, and develop projects to serve them better
Engage with the performance team efforts such as bug triage and strategy
Promote and encourage the use of our performance tools within and beyond Mozilla by writing and talking about them
Engage with our community and mentor volunteers contributing to the codebase

Our take

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.

Freddie

Company Specialist at Welcome to the Jungle

Insights

Led by a woman

12% employee growth in 12 months

Glassdoor (4.1)

Trustpilot (2.7)

Company

Funding (last 2 of 3 rounds)

Apr 2018

$1.2m

GRANT

Jan 2005

$0.3m

ANGEL

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 HQ

Rincon Hill, San Francisco, CA

Leadership

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.

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