Tech-Reader.blog

Solving Multi-Region DB Latency and Compliance on AWS Problem A Y Combinator–stage startup is using a single AWS-hosted relational database but experiencing performance issues from users in other regions. Worse yet, compliance regulations prohibit data from crossing regional boundaries. They want low latency, minimal complexity, and strong data residency. Clarifying the Issue The challenge lies in designing a multi-region relational database architecture that: Keeps user data inside its region (compliance) Reduces cross-region latency (performance) Doesn’t require running and syncing separate databases per region (complexity) They considered Aurora DSQL and asked for advice in an AWS Slack community. Why It Matters As global apps scale, data locality becomes c...

🧠 Insight: Test Your Python Skills With These Brain Teasers 🐍 Aaron Rose 4 min read This article was originally published on Medium. Think you know Python? These seven gotchas will test your instincts, twist your brain, and make you question everything — just a little. Python is beloved for being elegant, readable, and… completely unpredictable if you’re not paying attention. If you think you know Python inside and out, these brain teasers might just leave you scratching your head — or flipping a table. Let’s play a game. Below are a few seemingly innocent Python snippets. You guess what happens. Answers and explanations follow, but no peeking. Unless you’re one of  those  people. 1️⃣ What gets printed? def func ( a, b=[] ): b.append(a) return b print (func( 1 )) print (func( 2 )) print (func( 3 )) You think: Every call to  func  should return a new list, right? Right?? Actual Output: [1] [1, 2] [1, 2, 3] Why: Default mutable arguments are shared between ...

  🐱 Build: Use AWS Services to Build a CatGram App Aaron Rose 5 min read This article was originally published on Medium. Stop memorizing services. Start thinking like an architect. Click through real decisions to build your first scalable app. What Makes This Different Forget step-by-step tutorials where you mindlessly copy commands. This is about  thinking like an architect.  Each decision point forces you to consider real constraints: cost, scale, reliability, and simplicity. You won’t just learn what AWS services do — you’ll discover  when and why  to use them. By the end, you’ll have architected a complete application and developed the mental framework to tackle any system design challenge. Ready to think through your first cloud architecture? The Challenge You’re building  CatGram  — Instagram for cats. Simple concept: users upload cat photos, the app creates thumbnails, stores metadata, and serves photos to other users. Your first user just hit...