Introducing MergedCode

If you have prepared for product-company interviews, you already know the tab chaos. One site for coding problems. Notion or Google Docs for Core CS notes. PDFs for DBMS and operating systems. Maybe Excalidraw for that URL shortener you sketched twice and still cannot whiteboard cleanly. Each tool does one job well, but none of them remember what you revised last month, what you bookmarked, or which medium problem you should repeat before the onsite. MergedCode is our answer to that fragmentation: one workspace where DSA practice, Core CS, and system design share the same layout, synced across web and mobile.

Why we built it

We did not set out to build another coding judge or a prettier notes app. Candidates already have judges. What they lack is structure that survives second and third revision passes—when speed matters more than discovery. Spreadsheets break when you track hundreds of problems with tags, difficulty, and solved status. Bookmarks scattered across browsers do not survive a commute on your phone. System design prep fades when diagrams live in screenshots that never connect back to the Core CS chapter you read. MergedCode ties those threads together so prep feels like one habit, not five side projects.

What you get

At the center is the merge sheet: more than 540 curated DSA problems with difficulty, topic, and progress on every row. Around it sit Core CS hubs—DBMS, operating systems, computer networks, OOP, DevOps, and more—written for interview revision, not textbook completeness. System design is split into fundamentals, high-level design, and low-level design. Each track has ordered Core CS lessons and problem workspaces with pan-and-zoom architecture diagrams on an Excalidraw canvas. Bookmarks, custom sheets, solved markers, and activity heatmaps are built in—not bolted on. You are not juggling five subscriptions or five browser profiles; progress and bookmarks follow the same account whether you revise at a desk or on the bus.

• Merge sheet with 540+ curated DSA problems
• Core CS subject hubs beside your problem list
• HLD and LLD theory plus diagram workspaces
• Bookmarks and custom sheets across all content
• Web and mobile with one account and synced progress

How to use it

A simple loop works well: solve from the merge sheet, jump to Core CS when a topic feels rusty, then open one design problem a week to sketch under time pressure. Mark problems solved when the approach is clear—not only when code passes. Star Core CS chapters you keep forgetting. Retry design prompts with cleaner diagrams. Before mocks, open bookmarks instead of rebuilding lists from memory. We built MergedCode for learners who treat interviews as a months-long revision cycle, not a two-week cram. The second pass should feel faster because the workspace already knows where you left off.

Plans and access

MergedCode is paid-only. Choose monthly or yearly billing through Razorpay and get full platform access immediately—no partial free tier, no locked chapters. Sign in, pick a plan, and open your merge sheet. That is the whole onboarding. Core CS, system design, bookmarks, and progress tracking are one click away in the same shell you will use on interview week.