MozillaHiring

Senior Software Engineer, Privacy

  • Remote, Spain
  • Senior
  • Posted 7 days ago
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In one line

Privacy engineering job on an open-source browser, shipping anti-tracking code in C++, Rust and JavaScript; distributed team, mostly Europe and US East.

About the role

Fits an engineer who cares about an open web and wants their code running for a very large user base. The team works asynchronously across time zones and changes the browser engine itself.

At a glance

Pay
Not stated in the posting
Remote scope
Remote, Spain
Seniority
Senior
Skills
Rust, JavaScript, Gecko, Chromium, WebKit, Python, SQL
Posted
22 Oct 2026
Last checked
29 Oct 2026

What you will do

  • Build anti-tracking and threat intelligence features into the browser to cut down tracking and phishing.
  • Make architectural changes inside Gecko, the engine the browser runs on.
  • Ship C++, JavaScript and Rust code that is fast, low-latency and maintainable.
  • Coordinate with a distributed team spread mostly across Europe and the US East coast.
  • Work asynchronously, writing things down so decisions travel across time zones.

What they look for

  • Bachelor's in computer science, engineering or a related subject, or equivalent experience.
  • At least four years of C++ and Rust, backed by strength in memory safety, multi-threaded architecture or raw data stream work.
  • Evidence you can get up to speed fast and then deliver and improve complex projects.
  • A history of scoping and landing complex features independently under tight release windows.

Nice to have

  • Prior work on browser engines such as Gecko, Chromium or WebKit, or on web engine runtime abstractions.
  • Interest or experience in ML pipelines that automate internal developer workflows.

Benefits

  • Retirement contributions with immediate full vesting, whether or not you pay in.
  • One-time home office stipend and a yearly professional development budget.

How Keywordise applies for you

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Claude

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Muse

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Message for Muse
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Muse is available in the US only for now.

Prompt
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Questions about this job

Can I do this job remotely, and from which countries?

Yes, it is listed as remote, aimed at candidates in Spain.

What does this job pay?

No pay range is stated in the posting.

What experience is needed?

It is a senior role. The posting asks for: bachelor's in computer science, engineering or a related subject, or equivalent experience; at least four years of C++ and Rust, backed by strength in memory safety, multi-threaded architecture or raw data stream work; evidence you can get up to speed fast and then deliver and improve complex projects. Skills it names include Rust, JavaScript, Gecko, Chromium.

How do I apply with Keywordise AI?

Click Apply with Keywordise AI, create an account and upload your CV. Your CV and cover letter are written for this job from what you have really done, then Keywordise applies for you. Trial: 7 days, no card.

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