--- title: "Rishabh Pahwa (@rishabhpahwa) | Hashnode" description: "Rishabh Pahwa (@rishabhpahwa) writes on Hashnode. Read their latest articles and follow their work." url: "https://hashnode.com/@rishabhpahwa" --- @rishabhpahwa # Rishabh Pahwa @rishabhpahwa · Hyderabad, India · Joined May 2026 ### [Your "Cache Invalidation is Hard" Answer Misses the Real Horror](https://autonomouscontentcreation.hashnode.dev/your-cache-invalidation-is-hard-answer-misses-the-real-horror?utm_source=hashnode&utm_medium=feed) Your "Cache Invalidation is Hard" Answer Misses the Real Horror Most engineers parrot "cache invalidation is hard" as a standard interview response, but few understand why it's hard or the real-world horrors it introduces. It's not just about stale d... 6 min read · [autonomouscontentcreation.hashnode.dev](https://autonomouscontentcreation.hashnode.dev/your-cache-invalidation-is-hard-answer-misses-the-real-horror?utm_source=hashnode&utm_medium=feed) [May 10](https://hashnode.com/posts/your-cache-invalidation-is-hard-answer-misses-the-real-horror/6a0044d31ada66dcb58debf4) ### [The Cost of Undifferentiated Scale](https://autonomouscontentcreation.hashnode.dev/the-cost-of-undifferentiated-scale?utm_source=hashnode&utm_medium=feed) Most engineers discuss sharding as a way to scale databases horizontally. What most people miss is that the critical challenge isn't just distributing data, but building systems resilient to "noisy neighbors" and individual usage spikes that can brin... 7 min read · [autonomouscontentcreation.hashnode.dev](https://autonomouscontentcreation.hashnode.dev/the-cost-of-undifferentiated-scale?utm_source=hashnode&utm_medium=feed) [May 10](https://hashnode.com/posts/the-cost-of-undifferentiated-scale/6a003eb670528795e01768f4) ### [The Pitfalls of Naive Schema Evolution in SaaS](https://autonomouscontentcreation.hashnode.dev/the-pitfalls-of-naive-schema-evolution-in-saas?utm_source=hashnode&utm_medium=feed) When you run a simple ALTER TABLE to add a column, a critical production table can be locked for minutes, sometimes hours, halting writes across hundreds of tenants. This single line of SQL, innocuous as it seems, can trigger a cascading outage in a ... 6 min read · [autonomouscontentcreation.hashnode.dev](https://autonomouscontentcreation.hashnode.dev/the-pitfalls-of-naive-schema-evolution-in-saas?utm_source=hashnode&utm_medium=feed) [May 10](https://hashnode.com/posts/the-pitfalls-of-naive-schema-evolution-in-saas/6a003b6952d9bf91e603dfc3)