Senior Software Engineer

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, and Pocket, a service for keeping up with the best content online. 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 Relay Engineering Team is committed to building tools that empower users to manage their online identities and maintain their privacy. We work on various ongoing and upcoming projects, ranging from sustaining existing products to integrating new solutions for scalability and security. We are a highly collaborative team that thrives on innovation, feedback, and continuous improvement.

As a Senior Software Developer at Mozilla, you will be an integral part of the Relay Engineering Team, responsible for building and maintaining key backend systems and supporting frontend implementations. You’ll work on projects that focus on privacy and security, including features like email and phone number masking, which are central to our users’ online safety.

What you’ll do: 

• Lead frontend development, working with JavaScript, Typescript, React, and next.js
• Contribute to backend development when required, using Python, Django, and PostgreSQL
• Design, implement, and maintain code for email and phone number masking using AWS and Twilio APIs, focusing on security and privacy, in alignment with Mozilla Relay’s core objectives.
• Periodically rotate into a Base Load Engineer (BLE) role: handling releases, dependency updates, and incoming work requests, including bug reports and customer support requests.
• Collaborate with DevOps (SRE) to manage and maintain production environments, ensuring robust deployment processes.
• Monitor and optimize system performance, leveraging tools such as Grafana, Sentry, and BigQuery …