Backend Software Engineer, Ads

Mozilla

About The Position

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.

Requirements

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
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

Nice To Haves

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

Responsibilities

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

Benefits

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)