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	<title>Remote Work UkraineSenior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine) at Mozilla (Remote) | Remote Work Ukraine</title>
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	<title>Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine) at Mozilla (Remote) | Remote Work Ukraine</title>
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		<title>Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine)</title>
		<link>https://remoteworkukraine.com/remote-job/senior-contract-c-javascript-software-engineer-firefox-browser-engine-mozilla-10-20-2026/</link>
		<comments>https://remoteworkukraine.com/remote-job/senior-contract-c-javascript-software-engineer-firefox-browser-engine-mozilla-10-20-2026/#respond</comments>
		<pubDate>Tue, 20 Oct 2026 23:20:30 +0000</pubDate>
		<dc:creator>Mozilla</dc:creator>
		
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				<description><![CDATA[
			<p><b>Employer</b>: Mozilla</p>
						<p><b>Job Type</b>: Contractor</p>
						<p><b>Location</b>: </p>
			<p>The role You will help the Firefox DOM Core team...</p>
<p>The post <a href="https://remoteworkukraine.com/remote-job/senior-contract-c-javascript-software-engineer-firefox-browser-engine-mozilla-10-20-2026/">Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine)</a> appeared first on <a href="https://remoteworkukraine.com">Remote Work Ukraine</a>.</p>
]]></description>
			<content:encoded><![CDATA[
			<p><b>Employer</b>: Mozilla</p>
							<p><b>Job Type</b>: Contractor</p>
						<p><b>Location</b>: </p>
			<h3><strong>The role</strong></h3>
<p><span style="font-weight: 400;">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.</span></p>
<h3><strong>Responsibilities</strong></h3>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">Write Web-Platform tests to improve the coverage, and Gecko mochitests as needed </span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Fix the problems and pass the tests to improve the Gecko correctness</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Work through code review with the relevant Gecko module owners and iterate to landing</span></li>
</ul>
<h3><strong>Definition of done</strong></h3>
<p><span style="font-weight: 400;">Improved Session History test coverage and code correctness in Gecko, measured by passed test cases, allowing the team&#8217;s senior engineers to focus on security, performance and strategic projects.</span></p>
<h3><strong>Required qualifications</strong></h3>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">Substantial experience in a browser-engine codebase or in automating for a browser-engine, ideally Firefox/Gecko.</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Solid Javascript and applying that language skill to write automated tests.</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Proficiency in and experience developing software in C++.</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Strong debugging skills in a mature larget codebase.</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Comfort working in the open: public bugs, code review, and upstream landing.</span></li>
</ul>
<h3><strong>Preferred</strong></h3>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">Prior contributions to Gecko or another major browser engine.</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Familiarity with web standards and Web Platform Tests.</span></li>
</ul>
<p>The post <a href="https://remoteworkukraine.com/remote-job/senior-contract-c-javascript-software-engineer-firefox-browser-engine-mozilla-10-20-2026/">Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine)</a> appeared first on <a href="https://remoteworkukraine.com">Remote Work Ukraine</a>.</p>
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