Why Mozilla?

Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people.

The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders – only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms.

About this team and role:

In support of our mission to make the internet a healthier place, we aim to make Firefox the best mobile browser for security, privacy, speed, and empowering user choice. Firefox Mobile is used by tens of millions of people across Android and iOS every month. The Test Engineering team is responsible for making sure that experience is excellent – through test automation infrastructure, observability tooling, and hands-on exploratory testing. We're growing this team's scope and ambition, and we're looking for a senior leader to own it.

This is a role for someone who thinks about quality the way a great product manager thinks about users: with curiosity, with ownership, and with a bias toward finding the things that matter most. You'll set our overall test strategy, lead our exploratory testing program, and manage a team of engineers building the automation infrastructure and observability tooling that keeps Firefox Mobile healthy at scale.

You'll manage a team of full-time engineers plus a group of contractors, and you'll work in close partnership with our Android and iOS engineering, product, and UX teams to help us all collectively drive greater development speed, developer ease, and product quality.

What you’ll do:

In concert with senior mobile leadership, you will set and own Firefox Mobile’s overall quality strategy – not as a set of metrics to report, but as a product outcome to drive.
Manage our Test Automation Engineering, ensuring we understand and prioritize the highest impact work and detect bugs earlier in the process, in deep partnership with our iOS and Android dev teams
Oversee our observability work, including dashboards and automated reporting that give engineers early visibility into quality regressions, crash trends, and product health signals.
Lead our exploratory testing work, including teaching exploratory testing skills and structuring our exploratory testing program.
Partner closely with Product, UX, and Engineering leadership to identify quality gaps and advocate for fixes – representing the user's perspective in technical conversations.
Manage and support a geographically distributed team.

What you’ll bring:

10+ years of experience in test engineering, including 5+ years in technical management roles.
A genuine philosophy about software quality – you have opinions about exploratory testing, test automation strategy, and how to build teams that actually improve products and processes.
Experience building or significantly transforming a testing practice, including hands-on knowledge of exploratory testing methods and test automation approaches.
Track record of building collaborative relationships with development teams and influencing how engineers think about quality – without owning all the testing yourself
Ability to synthesize qualitative and quantitative signals (crash rates, store ratings, user feedback, test results) into a coherent picture of product health and a clear set of priorities.
Strong communication skills and track record of effective partnership with Product, UX, and senior engineering leadership.
Able to grow and scale a distributed team members with a range of skills and backgrounds.
Commitment to our values:
- Welcoming differences – Foster an inclusive and equitable team environment.
- Being relationship-minded – Build trusting partnerships across Mozilla and the broader community.
- Practicing responsible participation – Promote ethical and privacy-aware use of AI.
- Having grit – Lead through ambiguity and pursue impactful goals with persistence and creativity.

Bonus points for:

Hands-on experience with mobile testing on Android and/or iOS.
Familiarity with test automation frameworks for mobile (e.g. XCUITest, Espresso, or similar)
Experience working in open source environments
Background in or strong appreciation for user research and UX as inputs to quality

What you’ll get:

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)

About Mozilla

Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online.

Commitment to diversity, equity, inclusion, and belonging

Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions.

We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@mozilla.com to request accommodation.

We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.

Group: C

#LI-REMOTE

Req ID: R3095

Hiring Ranges:

Remote Germany

€130.000—€173.000 EUR

Mozilla

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Senior Manager, Firefox Mobile Test Engineering