Backend Software Engineer, Ads

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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:

The Ads Engineering organization at Mozilla builds shared infrastructure that supports ethical, privacy-forward advertising across Mozilla’s products. Our work spans backend systems that enable advertising inventory management, forecasting, campaign execution, measurement, and reporting across all Mozilla properties.

As a Backend Software Engineer on Ads Engineering, you’ll contribute to backend services, data integrations, and internal tooling that help operational and business partners work more efficiently and reliably. You’ll work alongside engineers, product managers, and cross-functional stakeholders to deliver well-scoped features and improvements, while learning the domain and growing your impact over time.

What you’ll do:

• Build and maintain backend services that support advertising functionality across Mozilla products
• Implement APIs, data flows, and integrations between internal systems and external partners used in Ads workflows
• Contribute to systems that prioritize correctness, reliability, and scalability in a privacy-conscious environment
• Work with product managers, engineers, and cross-functional partners to deliver well-scoped features and improvements
• Participate in code reviews, design discussions, and on-call or operational responsibilities as part of the team
• Incrementally take on more complex problems as you develop familiarity with Ads systems and domain concepts

What you’ll bring:

• 3+ years of professional software engineering experience
• Experience building backend systems using languages such as Go, Python, or Rust
• Familiarity with APIs, service-oriented architectures, and system integrations
• Exposure to data pipelines, analytics systems, or ad-tech concepts is a plus, but not required
• Some experience working with modern frontend frameworks (such as React) is a bonus
• Ability to work effectively in a distributed, asynchronous environment
• Clear written and verbal communication skills
• Comfort working on well-defined problems while navigating some ambiguity with support from teammates
• Commitment to our values:

• Welcoming differences
• Being relationship-minded
• Practicing responsible participation
• Having grit

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: E

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Req ID: R3056

Hiring Ranges:

US Tier 1 Locations

$113,025—$150,700 USD

US Tier 2 Locations

$102,975—$137,300 USD

US Tier 3 Locations

$95,100—$126,800 USD

Hiring Ranges:

Canada Tier 1 Locations

$82,125—$109,500 CAD

Canada Tier 2 Locations

$74,250—$99,000 CAD