Implemented end-to-end encryption for mobile push notifications.

• Several self-hosted orgs were unable to adopt Zulip due to their data protection policies, which required E2EE notifications. With encryption in place, those orgs now happily use Zulip!
• It was great to see symmetric cryptography in action across a complex setup - mobile apps, self-hosted servers, cloud server, push service, and FCM/APNs - all working together.

Implemented a core piece of Zulip's notification subsystem.

• Got a shoutout in the Rust community, which felt amazing as an undergrad to see my work being useful to folks building something as cool as the Rust programming language :)
• It was the first time I worked on such a long, engineering-heavy project. The whole thing spanned 7-8 months and involved tons of product and technical discussions.
• Helped me grow from open source newbie to full-time offer at Zulip.