System Design Projects

Design a globally distributed chat platform with low-latency delivery, offline sync, read receipts, media attachments, and strong consistency guarantees for message ordering.

Design a global CDN with edge caching, origin shielding, request routing, cache invalidation, and cost-aware traffic steering.

Design a global Kubernetes control plane that manages desired state, policy, and rollout safety across many regional clusters with strict reliability and consistency guarantees.

Design a distributed scheduler that executes large DAG-based workflows with strict dependency tracking, retry isolation, and multi-region control.

Design a globally distributed commerce system with catalog, cart, inventory reservations, checkout orchestration, multi-PSP payments, fulfillment, and financial ledger correctness.

Design a secure, high-throughput platform that runs untrusted code in short-lived sandboxes with strict isolation, low cold-start latency, and global scale.

Design a global federated learning control plane that coordinates device training rounds, secure aggregation, and safe model rollout without centralizing raw user data.

Design a cloud drive system with metadata consistency, chunk uploads, sharing permissions, sync clients, and global replication.

Design a strongly reliable key-value store with partitioning, replication, quorum reads/writes, and predictable low-latency access.

Design a globally distributed news feed system that supports real-time post ingestion, personalized ranking, fanout, and low-latency timeline reads at massive scale.

Design a globally distributed notification platform that delivers email, push, SMS, and in-app messages reliably with user preferences, rate limits, and delivery observability.

Design a low-latency personalization platform that retrieves candidates, hydrates online features, and re-ranks results in real time under strict latency and quality SLOs.

Design an analytics platform that applies differential privacy and strict privacy budget controls while still serving useful product insights at high scale.

Design a globally distributed ride-sharing platform with real-time driver location ingestion, low-latency dispatch, dynamic pricing, trip state consistency, and fault-tolerant payments.

Design a low-latency autocomplete platform with prefix indexing, ranking, personalization, and abuse-resistant query ingestion.

Design a web-scale search engine with crawling, indexing, ranking, retrieval, and relevance feedback loops.

Design a social graph platform for follow/block/mute relationships with low-latency traversals and high-write edge updates.

Design a high-concurrency ticketing system with seat holds, anti-oversell guarantees, payment flows, and event surge handling.

Design a large-scale video streaming system with upload processing, adaptive bitrate delivery, CDN distribution, recommendation signals, and strict playback reliability targets.

Design a distributed web crawler with politeness controls, deduplication, canonicalization, and indexing throughput at internet scale.

Design a globally distributed presence platform that tracks online/offline state for millions of users with low-latency fanout, privacy controls, and replay-safe reliability.

Design a production-grade platform for logging LLM prompts and responses, redacting sensitive data, evaluating quality/safety in near real time, and routing actionable incidents.

Design a production-grade model drift detection platform that monitors live inference traffic, detects drift in minutes, and routes actionable incidents with low noise.

Design a low-latency online feature store that serves consistent features for real-time ML inference while guaranteeing training/serving parity and point-in-time correctness.

Design a production hybrid retrieval system that combines dense vector search with sparse lexical search, then reranks results for high-quality relevance at low latency.

Design a platform that removes duplicate events across distributed pipelines with low latency.

Design a metrics platform that handles high-cardinality labels with fast query performance.

Design a real-time leaderboard system that serves millions of players with p99 rank reads under 80ms, handles 1.2M score updates/sec, and enforces explainable anti-cheat decisions.

Design a platform that manages schema changes across services with compatibility guarantees, automated migration workflows, and data contract enforcement at scale.

Design a serverless event routing system using AWS EventBridge patterns with content-based routing, intelligent retry strategies, dead-letter queue analytics, and poison pill handling for mission-critical event-driven architectures.

Design an analytics database that supports historical queries at any point in time, leveraging MVCC, snapshot isolation, bi-temporal data modeling, and tiered storage for cost-efficient petabyte-scale temporal analytics.

Design a system that captures database changes in real-time and streams them to downstream systems with schema evolution support, exactly-once delivery, and multi-database compatibility.

Design a system that triggers real-time alerts when millions of users enter or exit geographic zones, supporting complex polygon boundaries, high-frequency location updates, and sub-second detection latency.

Design a distributed cache system like Redis or Memcached that handles millions of requests per second with sub-millisecond latency, high availability, and intelligent eviction policies.

Design a system that detects anomalies in streaming data using ML models with adaptive thresholds and explainable alerts

Design a branching and merging system for real-time collaborative documents with CRDT sync, conflict resolution, and full audit history.

Design an event replay platform that allows developers to capture, store, and replay events from microservices for debugging and testing purposes. Enable time-travel debugging across distributed systems.

Design a platform providing cryptographically enforced tenant isolation with data residency, per-tenant encryption, and privacy-preserving analytics.