Software Engineer, Release Engineering

Mozilla; Canada; On-site; CAD 90,000 - 120,000; Full time

Benefits offered by this job

Bonus plans

Medical, dental, and vision coverage

Retirement contributions

Home office stipend

Well-being stipend

Parental leave

Employee referral program

Life/AD&D, disability, EAP

Job summary

Mozilla is seeking a Release Engineer to optimize and maintain our build and deployment pipeline. You will write scalable software that drives the Firefox release process and collaborate with senior engineers to enhance developer experience across a distributed team in North America and Europe.

The role emphasizes release automation, CI/CD, and working across Windows, macOS, and Linux, with a strong focus on ensuring reliable deployments and quick responses to outages.

Qualifications

• Bachelor's degree in computer science or equivalent work experience.
• Minimum 2 years of experience in an object‑oriented programming language (preferably Python).
• Passion for CI/CD pipelines and release automation.
• Experience with cloud resources (AWS, GCP, or Azure).
• Comfort developing across Windows, macOS, and Linux; shell scripting experience.
• Experience with globally distributed teams across time zones.

Responsibilities

• Write scalable software; thousands of tasks run to build, test, and release Firefox daily.
• Collaborate with senior engineers to improve developer experience and implement improvements.
• Work with a geographically distributed team between North America and Europe.
• Collaborate through code reviews and peer feedback.
• Respond to critical service outages during working hours (no on-call rotation).

Skills

Python

OOP

CI/CD

Shell scripting

Cloud platforms

Distributed teamwork

Education

Bachelor's degree in computer science or related field

Tools

Git

Job description

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:

At Mozilla, our Release Engineering team (RelEng) plays a crucial role in ensuring the seamless and reliable delivery of our world-class software products. As a key part of our engineering infrastructure, RelEng is responsible for the continuous deployment of our products, ensuring they reach our users efficiently and without interruption. For instance, we can reliably ship a security fix to > 200M users across different platforms and > 100 locales in under 24 hours.

RelEng has an expertise in configuring and optimizing our build and deployment pipeline. In order to provide a faster and more reliable experience for Firefox developers, RelEng is looking for an engineer who can help optimize and maintain the pipeline.

If you are passionate about release automation, the Release Engineering team at Mozilla is the place for you. Join us and be a part of a team that is making a significant impact on the web and beyond.

What you’ll do:

• Write software that scales - tens of thousands of tasks are run to build, test, and release Firefox every single day
• Collaborate with senior+ engineers to improve the developers’ experience, then implement the improvements.
• Work with a geographically-distributed development team between North America and Europe
• Collaborate with others by requesting and providing code reviews
• Respond to critical service outages (during normal working hours - no on call rotation is required)

What you’ll bring:

• You have a Bachelor's degree in computer science (or related programs) or equivalent work experience
• You have a minimum of 2 years of experience working in an object‑oriented programming (OOP) language (preferably Python)
• You are passionate about CI/CD pipelines
• You have some previous experience on using cloud resources (e.g. on AWS, GCP, or Azure)
• You feel comfortable developing in Windows, macOS, and Linux environments, experience with shell scripting
• You have worked on a team distributed across time zones
• You enjoy getting familiar and improving existing code bases and tools
• 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
• 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 orientation s, 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 [e-mail] 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.

At Mozilla, we’re serving humanity—by maintaining a safe, open internet—while also helping the individual humans employed here to reach their personal and professional goals. With a relatively small team serving hundreds of millions of people, a culture of exploration, and a commitment to mentorship, opportunities abound to learn and grow at Mozilla.

• Purpose is built into our work, with our mission driving every decision
• We challenge assumptions, the status quo, ourselves, and each other
• We are transparent: in our code, our business partnerships, and our everyday interactions
• We seek out people from diverse backgrounds and with perspectives different from our own
• We pair purpose with performance and put people ahead of profit

Our impact is global

• 1000+ paid staff from over 30 countries
• Thousands of volunteer contributors across six continents
• 2 global offices: Berlin and Toronto
• 9 coworking space locations: San Francisco, San Mateo, London, Paris, Portland, Tulsa, Vancouver, Chicago, and Bellevue
• Hundreds of home offices globally

Our benefits are world-class

• Flexible work environment (majority of Mozillians work remotely)
• 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)
• Reimbursement for professional development (up to $3,000/year)
• A work setup including the latest hardware and software of your choice