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Easy Quizzz

High-traffic European quiz platform — 500K+ DAU, 99.9% uptime, ~25% API latency reduction via Redis caching and PostgreSQL tuning on a Next.js + Hugo stack.

Easy Quizzz
System Design · Next.js + HugoClient: David MayerOctober 2021

Built with

Next.js
Hugo
Tailwind CSS
Redis
PostgreSQL
Redux

Approach

  • Next.js app shell for interactive quiz flows and routing
  • Hugo SSG for SEO landings — separate deploy path from the quiz API
  • Redis caching + PostgreSQL index tuning on the hot question-fetch path
  • Redux for predictable client state around sessions and selections

The problem

A European learning product needed to publish public quizzes at scale. Session starts and question fetches had to stay fast, and marketing pages had to rank, without coupling SEO content deploys to the interactive app.

Architecture decisions

  • Split static from interactive. Hugo for landings and evergreen content; Next.js for the quiz simulator. Shared design tokens, independent deploy cadences.
  • Read-heavy hot path. Question payloads are immutable per publish; Redis absorbs repeated fetches for popular quizzes.
  • Postgres as source of truth. Sessions and answers stay consistent on the primary; indexes on quiz/question and session access patterns.
  • Horizontal app tier. Stateless nodes behind a load balancer — scale replicas under evening peaks without sticky sessions on the core read path.

Outcomes

  • 500K+ DAU sustained on the production platform
  • 99.9% uptime on the app/API tier
  • ~25% API latency reduction after Redis + query optimisation

Related reading

System design cheat sheet

A practical cheat sheet for system design and architecture, covering trade-offs, scalability, microservices, load balancing, caching, and databases.

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