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Meta Cookie Notice

Last updated: October 6, 2026

1. INTRODUCTION

This notice (“Cookie Notice”) explains how Meta Platforms Ireland Limited (“Meta” or “we”), the data controller responsible for the use of cookies on this site, uses cookies on the Engineering at Meta website (Services). The notice also sets out how you can manage your cookie settings and withdraw your given consent in relation to the use of cookies and other technologies.

We encourage you to read this Cookie Notice closely. If you have any questions in this regard or otherwise in relation to our handling of cookies and other technologies, please don’t hesitate to contact us by using the contact details in Section 6.

If you want to have more information on how we process your personal information, please read our Privacy Notice.

2. WHAT ARE COOKIES?

A cookie is a small text file that is placed on your device when you visit a website or use an application. Cookies are widely used to make websites or mobile applications work or to improve their efficiency, as well as to provide a better experience, for instance by allowing the website or mobile application to recognize when a visitor returns to the website. When we talk about cookies in this Cookie Notice, this term also includes these similar technologies such as pixel tags and web beacons.

First-party cookies refer to cookies that we have placed on your device when you use our Services.

Third-party cookies refer to cookies that another party has placed on your device when you use our Services.

Permanent cookies refer to cookies that remain on your device when our Services are closed but are to be used on subsequent visits to or uses of our Services.

Session cookies refer to cookies that are temporary and disappear after our Services are closed.

3. THE PURPOSES FOR WHICH WE USE COOKIES

We use essential cookies for the site to work as intended. We set optional site analytics cookies only after you choose to allow them. Advertising pixels and social media tracking tags are disabled. Third-party embedded video players are described below.

Essential cookies are required for the site to work as intended and to remember your cookie choice. They remain in use when you decline optional cookies.

Cookie name Cookie purpose Cookie lifespan Cookie provider
meta-cookie-consent-v1 Remembers whether optional site analytics cookies have been allowed or declined on this browser. 6 months (180 days) Meta Platforms Ireland Limited

Optional site analytics cookies help us understand how people use this site and measure the performance of its content. They are set only after you allow them.

Cookie name Cookie purpose Cookie lifespan Cookie provider
_ga Distinguishes visitors to measure visits to this site. Set only with consent. 6 months (180 days) Google
_ga_0MPJMCK15K Maintains session state to measure the performance of content on this site. Set only with consent. 6 months (180 days) Google

EMBEDDED VIDEOS

Some pages include YouTube videos provided by Google. We use YouTube’s privacy-enhanced player. Views through this player are not used to personalize your YouTube experience or advertising outside this site. YouTube may still show non-personalized ads.

Embedded players may use cookies or other browser storage for video features, preferences, security and measurement. Privacy-enhanced mode does not guarantee that a player uses no storage. Cookie names and retention periods can vary with the player’s features, your browser and your existing provider settings. These are separate from the Google Analytics cookies listed above.

THIRD-PARTY COOKIE PROVIDERS

Google provides the optional site analytics service. Learn how Google uses information from sites that use its services and read Google’s Privacy Policy.

Google also provides the YouTube embedded player. Read about YouTube’s privacy-enhanced mode and Google’s use of cookies and similar technologies.

4. HOW TO MANAGE COOKIES

You can refuse optional site analytics cookies by clicking “Decline optional cookies” in the Cookie Banner. Clicking “Allow all cookies” enables the optional site analytics cookies listed above. Essential cookies remain in use to provide the site and remember your choice.

You can review or change your choice and withdraw consent at any time on the Settings page. Turning the optional site analytics control off stops site analytics and removes existing site analytics cookies that this site can access. Turning it on allows these cookies.

If you decline or withdraw consent, we will be unable to perform site analytics on this site using such cookies and similar technologies. You can continue to use the site. Your choice applies to this site on this browser and is remembered for 180 days (approximately six months). Clearing the preference cookie will show the banner again. Your browser may shorten the storage periods listed in this notice.

The Settings page controls optional site analytics cookies. Declining these cookies does not disable embedded video players. Embedded players can connect to their provider while site analytics is off. This site cannot remove cookies stored on a video provider’s domain; the provider information and browser controls below explain the additional choices available to you.

Use the Cookie Banner or the Settings page above to allow or refuse optional cookies and to withdraw consent. Browser settings are additional controls; they do not replace these choices or provide consent to optional cookies on this site. You can also use them to block or delete cookies. The links below provide guidance for common browsers.

Chrome
Firefox
Safari
Microsoft Edge

5. UPDATING THIS COOKIE POLICY

This Cookie Notice may be updated as considered necessary from time to time. In case any changes will be significant, we will inform you in an appropriate manner before the changes will come into effect, for example by sending you an email or by providing you with a notice when you use our Services.

We recommend that you read such information carefully and keep yourself up to date by periodically re-visiting the Cookie Notice.

6. CONTACT INFORMATION

If you have any questions in relation to this Cookie Notice or our handling of cookies and similar technologies please feel free to contact us:

Meta Platforms Ireland Limited. You can find information on contacting us in the Meta Privacy Policy.

Meta

Engineering at Meta is a technical news resource for engineers interested in how we solve large-scale technical challenges at Meta.

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We (Meta Platforms Ireland Limited) use cookies on this site. Some of these are essential cookies which are required for the site to work as intended. We also use optional cookies to perform site analytics and measure the performance of content on this site. You have control over the optional cookies that we use. If you choose to “Decline optional cookies”, we will be unable to perform site analytics on this site using such cookies and similar technologies. You can continue to use the site. You can continue to use the site. Learn more about our cookies and third-party providers in our Cookies Notice, or review or change your choices at any time in your Settings page.