New Products Principal Engineer

Mozilla Corporation; Canada; Remote; CAD 191,000 - 255,000; Full time

Job summary

Mozilla Corporation is seeking a Principal Software Engineer to lead the New Products team's browser-automation efforts. This role entails defining technical strategies, writing high-performance code, and mentoring engineers while delivering core libraries for intelligent web automation. The candidate should have extensive experience in developer tools and distributed systems, with a strong focus on code quality and system design.

Benefits

Generous performance-based bonus plans

Rich medical, dental, and vision coverage

Quarterly all-company wellness days

Country-specific holidays plus birthday day off

Annual professional development budget

Considerable paid parental leave

Qualifications

• 10+ years of software engineering experience building high-performance developer tools, SDKs, or distributed systems, with at least 3 years leading technical teams or large projects.
• Expert-level proficiency in at least two of: Go, Ruby (Rails), Python or TypeScript/JavaScript.
• Proven track record architecting and shipping complex, high-throughput systems in production environments (cloud, edge, or hybrid).

Responsibilities

• Define and communicate the long-term technical roadmap for our browser-automation stack.
• Write elegant, high-performance code daily in languages such as Go, Ruby on Rails, and TypeScript.
• Design distributed, fault-tolerant services and developer-facing SDKs/APIs.

Skills

Go

Ruby

Python

TypeScript

JavaScript

Automation Frameworks

Job description

To learn the Hiring Ranges for this position, please select your location from the Apply Now dropdown menu.

To learn more about our Hiring Range System, please click this link.

Why Mozilla?

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.

To learn the Hiring Ranges for this position, please select your location from the Apply Now dropdown menu.

To learn more about our Hiring Range System, please click this link.

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 New Products team at Mozilla is building a browser-automation stack for AI agents. Our mission is to make it effortless for developers to integrate fast, reliable web interactions into their agentic applications.

We are seeking a founding Principal Software Engineer who will set the technical vision, architect the platform, and spend the majority of their time writing production code alongside the team. You will guide a small, fast-moving group of engineers, and personally deliver the core libraries, services, and tooling that empower the next generation of intelligent web automation. If you thrive on rolling up your sleeves, love shipping code that developers adore, and enjoy shaping green-field products from the ground up, we’d love to meet you.

What you’ll do:

• Technical Strategy & Architecture: Define and communicate the long-term technical roadmap for our browser-automation stack, balancing rapid iteration with long-term maintainability and scalability.
• Hands-On Development: Write elegant, high-performance code daily in languages such as Go, Ruby on Rails, and TypeScript. Rapidly prototype, benchmark, and ship features to production.
• System Design & Infrastructure: Design distributed, fault-tolerant services and developer-facing SDKs/APIs. Own cloud infrastructure, CI/CD pipelines, security, and observability.
• Team Leadership & Mentorship: Grow, mentor, and inspire a world-class engineering team. Conduct thoughtful code reviews, establish the engineering culture, and foster a team of technical excellence and psychological safety.
• Collaboration & Product Direction: Work closely with product, design, and developer-relations to ensure technical choices align with developer needs and business goals. Turn community feedback into concrete improvements.
• Stakeholder Communication: Translate complex technical trade-offs into clear language for executives, partners, and cross-functional teams. Provide regular updates on progress, risks, and mitigation strategies.

What you’ll bring:

• 10+ years of software engineering experience building high-performance developer tools, SDKs, or distributed systems, with at least 3 years leading technical teams or large projects.
• Expert-level proficiency in at least two of: Go, Ruby (Rails), Python or TypeScript/JavaScript..
• Proven track record architecting and shipping complex, high-throughput systems in production environments (cloud, edge, or hybrid).
• Deep understanding of browser internals, automation frameworks (e.g., Playwright, Puppeteer, Selenium), and secure web interaction paradigms.
• Hands-on experience and opinions about modern AI/ML workflows or agent frameworks such as LangChain, LlamaIndex, or custom in-house systems.
• Strong focus on code quality, testability, performance, and operational excellence; familiarity with TDD, automated testing, and observability stacks.
• Exceptional communication skills with the ability to collaborate across disciplines and levels, from junior engineers to executive leadership.

Nice to have:

• Prior experience as a founding or early-stage CTO, Principal Engineer, or Staff+ engineer at a fast-growing startup or open-source project.
• Experience building to production systems in browser automation, AI tooling, or developer infrastructure.
• Knowledge of privacy-preserving technologies, secure computation, or web standards bodies.
• Experience optimizing build systems, WebAssembly pipelines, or cross-language bindings.
• Public speaking or writing history (talks, blogs, whitepapers) explaining complex technical topics to diverse audiences.

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 [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.

Group: B

#LI-REMOTE

ReqID: R2805

Hiring Ranges:

$191,000 - $255,000 CAD

$173,000 - $230,000 CAD

Create a Job Alert

Interested in building your career at Mozilla? Get future opportunities sent straight to your email.

Apply for this job

indicates a required field

First Name *

Last Name *

Email *

Phone

Location (City) *

Resume/CV *

Enter manually

Accepted file types: pdf, doc, docx, txt, rtf

Enter manually

Accepted file types: pdf, doc, docx, txt, rtf

LinkedIn Profile

Website

How did you hear about this job? * Select...

Have you been employed by Mozilla before? * Select...

If referred by a current Mozilla employee, please tell us who.

If offered this position would you be able to fill the position in one of the countries listed on the job posting without relocation assistance from Mozilla? * Select...

Are you authorized to work lawfully in the country to which you are applying for Mozilla? * Select...

(Skip this question if you are applying to work in Canada or the UK). Do you now or in the future require sponsorship? Select...

Select...

I have received, read and understand the privacy notice for job applicants at Mozilla.

Canada Demographic Questions

At Mozilla we value diversity, prioritize equity and inclusion, and proactively work to design hiring processes that mitigate bias. 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.

To help us track the effectiveness of these efforts, please consider answering the following demographic questions. Answering these questions is entirely voluntary . Your decision to respond (or not) won't be considered in the hiring process or thereafter. Any information you do provide will have no impact on the hiring process. Should you become a Mozilla employee, the information provided will not be transferred to your employee profile. In addition, the information you provide will be aggregated and dis-identified, ensuring that your responses cannot be traced back to you personally by Mozilla.

Which of the following best describes your race? Select...

Which of the following best describes your gender? Select...

Do you personally identify as transgender? Select...

Which of the following best describes your sex? Select...

Which of the following best describes your sexual orientation? (Select all that apply) Select...

Which of the following best describes your pronouns? (Select all that apply) Select...

Do you consider yourself to be a person with a disability? Select...