Work with Us

What is Thunderbird? Software made to make email easier.

Thunderbird is a free and open source email, newsfeed, chat, and calendaring client, that’s easy to set up and customize. One of the core principles of Thunderbird is the use and promotion of open standards - this focus is a rejection of our world of closed platforms and services that can’t communicate with each other. We want our users to have freedom and choice in how they communicate.

Open Positions

Senior Software Engineer Full Time / Remote

The Thunderbird team is looking to hire a hardworking senior software engineer. You will help update our code base and craft new features for this already very popular cross platform email client. We’re committed to moving our code base over to using primarily web technologies, and you’ll have a significant part to play in this effort. Contrary to many opportunities elsewhere, you have the opportunity to directly utilize the most groundbreaking developments in the browser engine.

As an engineer at Thunderbird, you will be working with our existing staff and community members from all over the globe. We are key contributors to open source, allowing you to show your skills to the world both on the code level and as a concrete result in improvements on the product.

This is a remote, full time position. We expect excellent written communication skills so as to foster strong work coordination over email, video conferencing, Matrix, and Bugzilla.

We’re looking for someone with:

Dedication to open source and open standards.
A mission of making a concrete positive impact on the day to day communication experience for tens of millions of users.
Strong understanding of web technologies.
About five years of validated experience developing with JavaScript/HTML/CSS.
Knowledge of C/C++.
Good problem-solving skills.
Familiarity with add-ons and previous open source engagement is a plus.
Experience with calendar systems would be desired, but not a must.

We are an equal opportunity employer and value diversity. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

How to Apply

Software Engineer Full Time / Remote

The Thunderbird team is growing, and we are looking to hire a dedicated and hardworking engineer to work with us on our ongoing maintenance work as well as feature development.

We’re committed to moving our code base over to using primarily web technologies, and you’ll be an important part of this effort. Contrary to many learning opportunities elsewhere, you’ll have the opportunity to utilize the most groundbreaking developments in the browser engine.

As an engineer at Thunderbird, you will work with our existing staff and community members from all over the globe. We are key contributors to open source, allowing you to show your skills to the world both on the code level and as a concrete result in improvements on the product.

This is a remote, full time position. We expect excellent written communication skills so as to foster strong work coordination over email, video conferencing, Matrix, and Bugzilla.

How to Apply

If a position sounds like a good fit for you, please send us your resume with a cover letter to [email protected]. In the subject of the email, please state the title of the position that you’re applying for, e.g. “Application for the Thunderbird Software Engineer position”.

A cover letter is essential to your application! Tell us about why you’re passionate about Thunderbird and this position. Also include samples of your work, either directly or as a link. If you contribute to any open source software, or maintain a blog we’d love to hear about it!

The successful applicant will be hired through the third-party service Upwork. Your work will be directed through the Thunderbird project’s technical manager. By applying for this job, you are agreeing to have your application reviewed by Thunderbird contractors and volunteers who are a part of the hiring committee as well as by staff members at the Mozilla Foundation and companies under its umbrella.

Get Involved

Thunderbird is an open source project, which means anyone can contribute ideas, designs, code, and time helping fellow users.

Join Us

Make a Donation • Get Support • Report a Bug

The Future of Thunderbird

Experience cutting edge features. Provide feedback to help refine and polish what will be in the final release.

Thunderbird Nightly

Help us test the newest developments made to Thunderbird every day by using the unstable Nightly channel.

WARNING! Nightly is an unstable testing and development platform, make sure you back up important data regularly!