Sanjana Reddy’s Post

How I Approach a New Codebase Joining a new project is like moving into someone else’s house, everything works, but you have no idea how. Over the years, I’ve walked into codebases that were pristine, chaotic and everything in between. The first few days can feel overwhelming with hundreds of files, unfamiliar patterns and sometimes zero context. Here’s my simple checklist that keeps me grounded every time 👇 🧩 1️⃣ Read the README (always). Sounds obvious, but it’s amazing how often it’s skipped. The README gives you the story behind the system like how to run it, what services it depends on and sometimes even its original intent. If it’s outdated, that’s still valuable, it tells you what changed over time. 🔍 2️⃣ Trace one flow end-to-end before touching a single line. Pick one use case Ex: user login or data ingestion Follow it from the controller → service → database → response. You’ll start seeing how everything connects, which modules are critical and where hidden complexity lives. This single step saves hours of random digging later. 🧪 3️⃣ Run the tests first. Tests are like codebase X-rays. They reveal assumptions, dependencies and patterns you might never notice just by reading files. Even when they fail, they’re useful. Every failed test is a hint about what changed, broke or needs care. 🧱 4️⃣ Look for patterns and not perfection. No system is perfect. Instead of judging code style or structure, I look for consistency. How are errors handled? How are logs written? How do modules talk to each other? Patterns tell you how the team thinks and that helps you integrate faster. I’ve learned that you can’t improve a system until you understand its rhythm. And once you do, refactoring and innovation come naturally not forcefully. What’s the first thing you do when you join a new repo? #SoftwareEngineering #Java #SpringBoot #AWS #CleanCode #CodeReview #BackendDevelopment #TechCommunity

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