1:1 calls, interview prep & career guidance with Sandeep Pal.
Web, mobile, ecommerce & growth — end-to-end for your business.
Public developer portfolio with certs & learning badges.
Formatters, converters, SEO checkers & more — no install.
Insights, tutorials, and career tips from the engineering community
Imagine you're building the next Amazon. Your application needs to store: Customer information Product catalog Orders Payments Reviews Shopping carts One of the first questions you'll face is: Should I use SQL or NoSQL?
Imagine you're using Amazon during the Big Billion Sale. You search for: "iPhone 16 Pro" Within milliseconds, thousands of matching products appear. Now imagine Amazon had to scan every product in its database before showing the results. Instead of milliseconds... It could take minutes. Imagine the experience for millions of users.
System Design Series — Part 33 Imagine you're ordering food on Swiggy. You click "Place Order." The app sends a request to the Payment Service. Suddenly... The Payment Service doesn't respond. Was the payment server completely down?
Choosing between Next.js App Router and a classic React SPA for SaaS and learning platforms: SEO, auth boundaries, deployment cost, and when hybrid rendering beats client-only routing.
Pricing tiers, trials, seat licensing, GST, dunning, and Stripe patterns for education SaaS—what Toolliyo-style platforms need before finance escalates.
Design points, badges, streaks, and spin wheels that increase course completion without cheap dopamine traps—ethics, data, and LMS implementation patterns.
Architecture lessons from a production LMS: bounded contexts, video delivery, progress tracking, multi-tenancy, and why the first version should not be 40 microservices.
care@toolliyo.com