What are the key considerations you would take into account when designing a highly available web service?

During my final year, I worked on a group project to design a student portal for our university. We prioritized high availability by implementing load balancing techniques to distribute traffic among multiple servers. This way, even if one server failed, the others could handle the requests without downtime. Additionally, we used a cloud service that automatically scaled resources based on demand, which helped us manage peak times like registration periods. We also made sure to include a backup database to ensure data wasn't lost in case of a failure. This experience taught me the importance of planning for failure and how crucial it is to maintain a seamless user experience.

While volunteering for a community event, I helped set up an online registration system. We knew that a high turnout was expected, so I suggested we use multiple registration points to avoid bottlenecks. We also created a backup plan for internet connectivity issues by having offline forms ready. By coordinating with local businesses for support, we ensured that even if one registration method failed, others would keep the process running smoothly. This experience highlighted the importance of contingency planning and how it can apply to web services, making sure that users always have access.

In my first role as a junior developer, I worked on a company blog that needed to be highly available. I implemented a caching strategy to store frequently accessed content, which reduced server load and improved response times. To further enhance availability, we set up a Content Delivery Network (CDN) to distribute the blog's content across multiple geographical locations. This ensured that even if one server went down, users could still access the blog from another location. This project taught me how to apply high availability concepts in real-world scenarios, ensuring users have a consistent experience.