About the role

The role

You will help the Firefox DOM Core team improve the health of the Session History area. You will write tests to improve the coverage; you will fix tests and/or problems to improve the Gecko correctness.

Responsibilities

Write Web-Platform tests to improve the coverage, and Gecko mochitests as needed

Fix the problems and pass the tests to improve the Gecko correctness

Work through code review with the relevant Gecko module owners and iterate to landing

Definition of done

Improved Session History test coverage and code correctness in Gecko, measured by passed test cases, allowing the team’s senior engineers to focus on security, performance and strategic projects.

Required qualifications

Substantial experience in a browser-engine codebase or in automating for a browser-engine, ideally Firefox/Gecko.

Solid Javascript and applying that language skill to write automated tests.

Proficiency in and experience developing software in C++.

Strong debugging skills in a mature larget codebase.

Comfort working in the open: public bugs, code review, and upstream landing.

Preferred

Prior contributions to Gecko or another major browser engine.

Familiarity with web standards and Web Platform Tests.

Interview prep

Walk in with sharper answers.

Use this as a quick practice sheet before you speak with the employer.

Mid

Technology & IT Javascript Senior Contract C++ Software Mid level

Likely questions

Tell us about work you have done that is close to the Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine) role.
How would you approach your first 30 days at Mozilla?
Which of Javascript, Senior and Contract have you used recently, and what did it help you achieve?
Describe a time you solved a problem without waiting to be told exactly what to do.
How do you handle busy days, changing priorities, or pressure at work?

Prepare before the call

A recent example that proves your experience with Javascript, Senior and Contract.
One short story with a problem, your action, and the result.
Two examples that show the strengths listed on your CV.
A clear reason why this role and company interest you.
Your availability, preferred work style, and salary expectations.

Ask them

What would success look like in the first 90 days?
What are the main problems this hire should help solve?
How does the team give feedback and measure good work?
What does a normal working week look like for this role?

Practice line

I am interested in the Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine) role because I can bring practical experience in Javascript, Senior and Contract, learn the team quickly, and contribute to the outcomes Mozilla needs from this hire.

Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine)

About the role

Walk in with sharper answers.

Likely questions

Prepare before the call

Ask them

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