---
title: 'Staff Software Engineer, Web Application Services at Mozilla'
canonical: 'https://feeny.ai/job/staff-software-engineer-web-application-services-mozilla-canada-k4p4mhaf1231'
type: 'job'
last_seen: '2026-10-15'
---

# Staff Software Engineer, Web Application Services at Mozilla

- **Company:** Mozilla
- **Location:** Canada
- **Work type:** remote
- **Posted:** 2026-09-27
- **Last confirmed live:** 2026-10-15
- **Apply:** https://job-boards.greenhouse.io/mozilla/jobs/8234153

## Job description

Why Thunderbird?

Thunderbird is one of the world’s most trusted open-source email applications, empowering more than 20 million people globally. At Thunderbird, we build privacy-respecting communication and productivity tools that help people manage their digital lives while staying in control of their data.

We are open source by design. Our products are developed transparently and in collaboration with a global community of contributors, and that same spirit shapes how we work: collaboratively, inclusively, and with a shared commitment to putting users first.

Our small but growing distributed team includes more than 65 people across seven countries. As Thunderbird evolves beyond a single desktop application, we are expanding across desktop, mobile, paid services, AI offerings, and enterprise-facing work to build independent, privacy-respecting alternatives to big tech ecosystems.

Our revenue model combines user donations, which help keep Thunderbird’s applications freely available, with paid services that cover the costs of hosted offerings while supporting long-term sustainability and continued innovation.

A note about Thunderbird and Mozilla: Thunderbird Technologies Corporation is the nonprofit-owned company behind Thunderbird email and a growing portfolio of products. While part of the Mozilla family, Thunderbird is a separate entity from Mozilla Corporation and Mozilla Foundation with its own compensation programs, benefits, and employment policies.

To learn more, visit [www.thunderbird.net](http://www.thunderbird.net)

The opportunity

As a Staff Software Engineer, Services, you’ll help shape the architecture and technical direction of web-based products that extend Thunderbird beyond email. The Services team is currently focused on building offerings such as an appointment calendar and secure file storage and transfer solutions, creating valuable experiences for our users while supporting additional revenue streams for Thunderbird.

This is a Staff-level individual contributor role with significant technical ownership and influence. You’ll work with designers, engineers, and community members to write code, build prototypes, solve complex problems, and make technical decisions that shape our products. You’ll take a holistic view of our code and systems, helping establish the architecture and software patterns that allow our Services products to evolve and scale.

You’ll also take on broad, ambiguous problems that have a direct impact on our goals, from improving our technical architecture to helping grow Services users and subscribers. Along the way, you’ll provide technical and product direction across teams, mentor other engineers, and identify ways to make our systems and processes more sustainable, scalable, and easier to work with.

## What you’ll do

- Lead the technical architecture of new Services products, taking ownership of complex projects and identifying improvements that strengthen our systems as they evolve.
- Write code, build prototypes and experiments, and contribute throughout the development lifecycle, from planning and testing through implementation, monitoring, and maintenance.
- Help establish software patterns and make technical decisions across our Services products, including investigating and proposing technology choices.
- Build and evolve analytics and infrastructure that help the team use user-generated data to inform decisions.
- Take on ambiguous, high-level problems with broad scope and direct impact on Services goals, including growing users and subscribers.
- Provide technical and product direction across Thunderbird and lead technical collaboration with other parts of Mozilla and community contributors when needed.
- Work closely with the team and community to surface issues, refine ideas, and develop practical solutions.
- Identify and plan improvements that make our systems and processes more accessible, self-serviceable, lower friction, sustainable, scalable, and easier to delegate.
- Mentor other engineers through code review, documentation, technical discussions, process improvements, and ongoing guidance.
- Stay current with evolving technologies, coding standards, libraries, and frameworks and apply that knowledge to your work.

## What you bring

- 10+ years of web software development experience, including experience designing scalable and efficient systems and launching complex web projects at scale.
- Expert-level JavaScript skills and knowledge of at least one additional programming language, such as Python, Rust, Go, or C++.
- An understanding of the business landscape, including challenges and opportunities, and experience collaborating with teams to expand Thunderbird’s user and donor base.
- Experience with front-end frameworks, full-stack development, and/or API development.
- Strong knowledge of software development practices, including testing, code review, and documentation, and the ability to help others develop these skills.
- Experience acting as a technical lead, solving complex technical problems, and providing mentorship and guidance to other engineers.
- Experience collaborating remotely across disciplines such as engineering, product management, QA, and design.
- Excellent written and verbal English communication and documentation skills, with the ability to communicate clearly and concisely with an international, geographically distributed team.
- Comfort working in an open-source environment and a commitment to Mozilla values.
- Ability to learn, evaluate, and responsibly use emerging technologies, including AI-enabled tools, to improve work processes.
- A commitment to continuous learning and staying current with industry trends and technologies.
- Ability and willingness to travel periodically, including internationally.

Bonus points for

- Experience with product management or product-focused work.

What success looks like

Success in this role will look like a strong technical leader who not only helps the Web Services team grow, but also has a direct hand in helping Thunderbird grow and evolve our product offerings.

Over time, your work will help:

- Grow & mature scalable, modern software patterns and architecture across Web Services products.
- Turn new product ideas and complex technical problems into working solutions, prototypes, and experiments.
- Partner with leadership and cross-functional partners (Product, Design, etc) to help generate data-driven product decisions.
- Provide clear technical and product direction across complex, cross-functional work.
- Help other engineers grow their technical, collaboration, and leadership skills.
- Support the growth of users and subscribers as Thunderbird expands its offerings beyond email.

Work environment

This is a full-time, fully remote position. You’ll join a distributed team of Thunderbird staff, open-source community members, and contributors from around the world.

We rely on clear communication, thoughtful documentation, and collaborative decision-making to work effectively across time zones and disciplines.

In this role, you’ll collaborate closely with designers, engineers, cross-functional teams across Thunderbird, other parts of Mozilla, and community contributors.

## Compensation & benefits

We benchmark our base salaries to local markets and target the 60th percentile of the peer market. The salary ranges for this role are:

- Canada: $155,000 - $190,000 CAD

We may consider candidates with strong skills but less than the required experience. Title, level and compensation will be determined based on qualifications and experience.

In addition to competitive salaries, we offer a comprehensive benefits package designed to support your whole self.

Work & career

- Fully remote work & schedule flexibility
- Company-provided laptop
- Annual bonus program
- Monthly remote work stipend
- Annual professional development stipend
- Access to Coursera learning platform
- Industry conferences
- Company all-hands and team gatherings

Rest & play

- 24 days PTO per year (prorated)
- Your birthday
- Year-end company shutdown
- 9 wellbeing days
- Public holidays
- Other paid leave
- Quarterly wellbeing stipend for personal / family activities

Health & family

- RRSP contributions
- Health, dental, & vision insurance
- Disability insurance
- Life insurance
- Employee assistance program
- Paid parental leave
- Paid sick days

Work eligibility

Applicants must reside in and have permanent work authorization for the country location(s) specified in the posting. We are unable to consider applicants outside of these markets at this time. And, we do not provide visa sponsorship.

How to apply

Please apply directly through our [career page](https://www.mozilla.org/en-US/careers/listings/?team=MZLA/Thunderbird). We carefully review every cover letter and screening question, so take the time to answer each fully. We value authentic, thoughtful responses that reflect your own experience and perspective. It is fine to use AI tools to polish your writing, but your answers should be your own. Candidates who submit generic or unoriginal AI-generated responses may be disqualified from further consideration.

Our commitment to diversity, equity, and inclusion

Thunderbird believes in the value of diverse creative practices and forms of knowledge, and knows diversity, equity and inclusion 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 not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities and expressions.

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. Thunderbird will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.

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 hiringaccommodations@thunderbird.net to request accommodation.

## #LI-DNI

## About Mozilla

## Company Overview
- **One-liner**: Mozilla is a global nonprofit-backed technology organization that builds privacy-first browsers, AI tools, and internet health initiatives to keep the internet open and accessible to all.
- **Entity Type**: Private (nonprofit foundation with a for-profit subsidiary — Mozilla Corporation)
- **Headquarters**: San Francisco, California, USA (remote-first globally)
- **Founded**: 1998 (Mozilla Project); 2005 (Mozilla Corporation)
- **Founders**: Originally founded by Netscape staff and the open-source community; key early leaders include Mitchell Baker (current CEO of Mozilla Corporation) and Brendan Eich (creator of JavaScript)

## Core Business
- **Primary industries**: Internet software & services, browser technology, digital privacy, artificial intelligence, online advertising technology
- **Target customers**: B2C (individual users — Firefox browser, Pocket, VPN, Relay); B2B (advertisers and publishers via Anonym); developers (open-source tools, MDN Web Docs, AI developer tools)
- **Mission statement**: "To ensure the internet is a global public resource, open and accessible to all." — Mozilla Manifesto

## Products & Services
- **[Firefox Browser](https://www.mozilla.org/en-US/firefox/)**: Privacy-focused web browser with tracking protection, available on desktop and mobile. Core product.
- **[Mozilla VPN](https://www.mozilla.org/en-US/products/vpn/)**: Virtual private network service for online privacy.
- **[Firefox Relay](https://relay.firefox.com/)**: Email masking service to protect user identities.
- **[Mozilla Pocket](https://getpocket.com/)**: Content discovery and read-later service.
- **[Mozilla Monitor](https://monitor.mozilla.org/)**: Data breach alert and personal data removal service.
- **[Mozilla.ai](https://mozilla.ai/)**: Open-source AI developer tools and trustworthy AI initiatives.
- **[Anonym](https://anonym.co/)**: Privacy-preserving digital advertising measurement platform (acquired by Mozilla in 2022).
- **[Fakespot](https://www.fakespot.com/)**: AI-powered tool to detect fake reviews and counterfeit products (acquired by Mozilla).
- **[MDN Web Docs](https://developer.mozilla.org/)**: Industry-standard web development documentation and learning platform.
- **[Mozilla Ventures](https://mozilla.vc/)**: Venture capital arm investing in responsible tech startups.

## Market Standing
- **Valuation/Market Cap**: Not publicly disclosed (private, nonprofit-backed organization)
- **Key Revenue**: Approximately $593 million in total revenue (2022, latest publicly available — Mozilla Foundation annual report). The majority comes from search partnerships (primarily Google).
- **Notable Partners**: Google (search partnership, revenue driver), Meta (via Anonym), Amazon, eBay, and major ad-tech platforms.
- **Growth Signals**: Mozilla has aggressively expanded through acquisitions (Anonym, Fakespot, Pulse, Active Replica); launched Mozilla.ai to bet on open-source AI; growing headcount across engineering, AI, and privacy product teams. As of 2024, the organization employs roughly 800–900+ people globally.

## Competitive Advantages
- **Brand trust and mission**: Uniquely positioned as a "not-for-profit" tech company — no shareholder pressure to maximize profit at user expense. Consistently ranked among most trusted tech brands.
- **Privacy-first product DNA**: All products are built with privacy and security as core features, not afterthoughts — a strong differentiator vs. Big Tech competitors.
- **Open-source foundation**: Transparent codebase, community-driven development, and strong developer credibility (MDN Web Docs is the gold standard for web dev learning).
- **Diverse revenue streams**: Beyond browser search deals, Mozilla is building a portfolio of subscription products (VPN, Relay, Monitor Plus) and ad-tech (Anonym) to reduce single-partner dependency.
- **Talent and culture**: Decades of experience in remote-first, asynchronous, globally distributed work. Strong engineering culture with deep expertise in privacy, security, and web standards.

## Strategic Focus
- **AI with trust**: Building open-source AI tools and models through Mozilla.ai, emphasizing transparency, privacy, and user agency — contrasting with closed, extractive AI from Big Tech.
- **Product diversification**: Reducing reliance on search revenue by scaling subscription products (VPN, Monitor, Relay) and ad-tech platform (Anonym).
- **Internet health advocacy**: Continuing policy work on data privacy, antitrust, and digital rights through the Mozilla Foundation.
- **Firefox revitalization**: Modernizing the browser with new features (vertical tabs, AI-powered tools, improved performance) to regain market share.
- **Acquisition integration**: Absorbing and scaling recent acquisitions (Fakespot for e-commerce trust, Anonym for privacy-first advertising).

## Why Work Here
- **Culture**: "Remote-first" company with a strong emphasis on asynchronous work, work-life balance, and global collaboration. The culture is mission-driven, collaborative, and values "responsible participation" — generosity and kindness in communication. [mozilla.org](https://www.mozilla.org/en-US/careers/)
- **Benefits (US employees)**:
    - **Health**: 100% premium coverage for medical, dental, and vision for employees and dependents.
    - **Mental health**: Free therapy and coaching sessions.
    - **Time off**: 12+ paid holidays, generous vacation and sick leave (accrued from day one), quarterly company-wide wellness days, and your birthday off.
    - **Parental leave**: 26 weeks paid for childbearing parents, 12 weeks paid for non-childbearing parents.
    - **Remote-first**: Work from anywhere with a strong stipend for home office setup. [mozilla.org](https://www.mozilla.org/en-US/careers/)
- **Engineering culture**: Engineers work on "some of the most interesting challenges facing the internet today — privacy, security, decentralization, access, convenience, compatibility." The Data Organization is at the forefront of using data to guide product decisions while respecting user privacy. [mozilla.org](https://www.mozilla.org/en-US/careers/)
- **Diversity & Inclusion**: Mozilla explicitly states it wants to be "a place where everyone can do their best work" and that "diverse perspectives and experiences result in better solutions." They publish transparency data on their progress.
- **Open roles**: As of mid-2025, Mozilla has ~90 open positions across engineering (Front-End, Machine Learning, Fullstack), product management, data analytics, marketing, and infrastructure. Key teams hiring include Firefox, Anonym, Fakespot, and Mozilla.ai. [greenhouse.io](https://job-boards.greenhouse.io/mozilla?gh_src=e5ad1d6b1us)

## Sources
1. [Mozilla Careers Page](https://www.mozilla.org/en-US/careers/)
2. [Mozilla About Page](https://www.mozilla.org/en-US/about/)
3. [Mozilla Job Board (Greenhouse)](https://job-boards.greenhouse.io/mozilla?gh_src=e5ad1d6b1us)
4. [Mozilla.org Homepage](https://www.mozilla.org/en-US/)
5. [Mozilla Open Positions List](https://www.mozilla.org/en-US/careers/listings/)

## Other roles at Mozilla

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