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

Thunderbird Release Engineer / Web Infra Engineer Full Time / Remote

Thunderbird is looking for a multi-skilled self-starter to work partly on release engineering, and partly on operating the cloud based web infrastructure around Thunderbird. You will be working in close cooperation with our release engineer, infra engineer and other staff, as well as with community members.

This is a remote, full time position. You are expected to have excellent written communication skills and coordinate your work over email, video conferencing, Matrix, and Bugzilla.

As a release engineer you will be serving the community, empowering them to make their contributions available to millions of people worldwide. Your focus will be on developing and maintaining the systems that are used for continuous integration and for making the final builds of the software available to end users. A large part of this is following and adjusting to improvements made by the Firefox release engineering team, since Thunderbird uses very similar tools and procedures. You will collaborate with QA, security, localization, and engineering to ship beta and release builds.

The Thunderbird project operates some server side infrastructure, such as the thunderbird.net web site and addons.thunderbird.net. As a web infra engineer you will be involved with infrastructure maintenance and development and of these web sites. The job involves full stack development of these properties, as well as monitoring their cloud based deployments.

Senior Software Engineers Full Time / Remote / 2 Available Openings

Thunderbird is looking to hire two senior software engineers to join the team. You will help modernize the codebase and design new features for this already very popular cross platform email client. We’re committed to moving the code base over to using primarily web technologies, and you’ll be part of this effort. Contrary to many opportunities elsewhere, you have the opportunity to directly utilize the most cutting edge developments in the browser engine.

As an engineer at Thunderbird, you will be working with existing staff and community members from all over the globe. We work very much in the open, and you’ll be able 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. You are expected to have excellent written communication skills and coordinate your work over email, video conferencing, Matrix, and Bugzilla.

Software Engineers Full Time / Remote / Multiple Available Openings

The Thunderbird team is expanding and wants to hire a few more passionate engineers to work with us on ongoing maintenance work as well as feature development.

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

As an engineer at Thunderbird, you’ll be working with existing staff and community members from all over the globe. We work very much in the open, and you’ll be able to show your skills to the world both on the code level and as a concrete results in improvements on the product.

This is a remote, full time position. You are expected to have excellent written communication skills and coordinate your work 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.

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.

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!