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Mozilla

Senior Backend Engineer

Job Summary

The Senior Software Engineer at Mozilla is responsible for designing and maintaining core backend systems that support privacy-respecting advertising across Mozilla products such as Firefox and Pocket. They should have at least 4 years of software engineering experience, with proficiency in technologies like Golang, Rust, or Java, and experience managing large-scale backend projects. The role involves mentoring junior engineers, contributing to industry-leading privacy-preserving ad technology, and collaborating across distributed teams. A strong emphasis is placed on aligning with Mozilla’s values, including inclusivity, responsible participation, and a commitment to data privacy and digital advertising expertise.

Required Skills

Communication Skills
Software Engineering
Rust
Java
Product Strategy
Golang
Digital Advertising
Risk Management
Data Privacy
Backend Systems
Ad Technology
Privacy-preserving
Peer Reviews
Distributed Team

Benefits

Performance-based bonus
Paid Parental Leave
Life Insurance
Disability Insurance
Wellness Days
Medical Coverage
Dental Coverage
Vision Coverage
Birthday Off
Home Office Stipend
Professional Development Budget
Retirement Contributions
Country Holidays
Well-being Stipend
Employee Referral Bonus
EAP

Job Description

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.

What is a Senior Software Engineer at Mozilla?

A Senior Software Engineer is the next level from a Software Engineer. At Mozilla, this role can vary, but is typically someone who is largely self directed after work is assigned and is advanced in their domain. They help team members get information they need to be successful while also being the go-to person for peer reviews in their domain. They have a solid understanding of the product strategy and can recommend solutions to critical issues when needed, assist junior engineers in risk management and escalation, and advocate for and implement changes that affect their team. A Senior Software Engineer actively seeks opinions and ideas from their team members, including those with varied experiences and perspectives to improve more collective results.

About this team and role:

We’re growing the Mozilla Ads product team, focused on display advertising in Mozilla products that is privacy-respecting and values-aligned. You will be responsible for designing, building, and owning the core backend systems that support advertising in clients (Firefox, MDN, Pocket, etc). You and your team will be the subject matter experts when it comes to advertising, providing guidance and shepherding to various product teams across Mozilla.

What you’ll do:

  • Participate in development of industry leading privacy preserving ad technology.
  • Leverage your understanding of product strategy to break down and deliver on key projects on our roadmap
  • Mentor others by stewarding some of your responsibilities to more junior engineers
  • Be a go-to resource for Mozilla’s ad stack to peers in partner teams

What you’ll bring:

  • 4+ years of overall software engineering experience.
  • Proven ability to successfully lead and ship large software projects with speed and quality.
  • Experience in working on complex backend systems at scale
  • Experience in one of the following technologies: Golang, Rust, or Java.
  • An interest and ability to work in a distributed team (which requires good asynchronous written communication skills as well as good verbal communication skills).
  • Commitment to our values:
    • Welcoming differences
    • Being relationship-minded
    • Practicing responsible participation
    • Having grit

Bonus Points for:

  • Experience in data privacy
  • Experience in digital advertising or advertising platforms

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 [email protected] 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: D

#LI-REMOTE

Req ID: R2849

Hiring Ranges:

Canada Tier 1 Locations
$104,000$139,000 CAD
Canada Tier 2 Locations
$94,000$126,000 CAD

Interested in this job?

Application deadline: Open until filled

Logo of Mozilla

Mozilla

Mozilla is the not-for-profit behind the lightning fast Firefox browser. We put people over profit to give everyone more power online.

See more jobs
Date PostedJuly 26th, 2025
Job TypeFull Time
LocationRemote Canada
Salary$104,000 - $139,000
Exciting remote opportunity (requires residency in Canada) for a Senior Backend Engineer at Mozilla. Offering $104,000 - $139,000 (full time). Explore more remote jobs on FlexHired!

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