Your Dashboard Study Practice My Sessions Peer Interviews

Backend

Database Sharding and Scaling
Idempotency

Batched Inference Service for an LLM API
Web Crawler (Distributed)
Web Crawler (P2P)
Crossword Solver Service
ChatGPT
Collaborative Coding Interview Platform
Group Chat with Threads (Slack-class)
Online Chess
Prompt Playground

HomeStudyBackend

Backend

System Design

Core Concepts

Backend Core Concepts

Full breakdowns, AI-guided practice on a live canvas, and mock interviews for Android system design and coding rounds.

ProductProblems Companies Interview process Product tour Pricing Contact

GuidesMobile system design Coding interview prep AI safety

AccountDashboard Sign in Create account

LegalPrivacy Terms Refunds

© 2026 returnzero