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Data modeling and storageFoundationsOpen topic

URL shortener for an internal company toolEasyDesignDesignEasy25 minPastebin with expirationEasyDesignDesignEasy30 minParking lot spot assignmentEasyDesignDesignEasy30 minMulti-user to-do backendEasyDesignDesignEasy25 minUser settings storeEasyDesignDesignEasy25 min

Media and uploadsLevel 2Open topic

Image thumbnail serviceEasyDesignDesignEasy25 minVoice note homework for a language schoolEasyDesignDesignEasy25 minPodcast hosting for a small networkEasyDesignDesignEasy25 minLesson videos for a cooking schoolEasyDesignDesignEasy30 minGuest photo album for weddingsEasyDesignDesignEasy25 min

Scale and cachingLevel 2Open topic

Feature flag storeEasyDesignDesignEasy25 minAPI rate limiterEasyDesignDesignEasy25 minPopular articles cacheEasyDesignDesignEasy25 minMenu pages for a food delivery appEasyDesignDesignEasy25 minReport card day for a school district portalEasyDesignDesignEasy25 min

Messaging and streamsLevel 2Open topic

Email job queueEasyDesignDesignEasy30 minIn-app notificationsEasyDesignDesignEasy25 minKitchen order screens for a restaurant groupEasyDesignDesignEasy30 minNew listing alerts for saved rental searchesEasyDesignDesignEasy25 minSending orders to a print partnerEasyDesignDesignEasy25 min

Security and privacyLevel 2Open topic

Session storeEasyDesignDesignEasy25 minPassword reset by email linkEasyDesignDesignEasy25 minAccess rules for a school grade bookEasyDesignDesignEasy25 minSigned webhooks for an invoicing APIEasyDesignDesignEasy25 minEncrypting answers on a clinic intake formEasyDesignDesignEasy30 min

Search and feedsLevel 3Open topic

Company announcements feedEasyDesignDesignEasy25 minProduct catalog searchEasyDesignDesignEasy25 minJob search for a regional job boardEasyDesignDesignEasy25 minStore locator for a pharmacy chainEasyDesignDesignEasy25 minRecipient autocomplete in a team chatEasyDesignDesignEasy25 min

Pipelines and analyticsLevel 3Open topic

Page view counterEasyDesignDesignEasy25 minNightly sales rollup for a store chainEasyDesignDesignEasy25 minSignup funnel events for a mobile appEasyDesignDesignEasy30 minHourly and daily rollups for smart thermostatsEasyDesignDesignEasy25 minExperiment report for a pricing page testEasyDesignDesignEasy30 min

Reliability and failoverLevel 3Open topic

Audit log writerEasyDesignDesignEasy25 minForecasts from a flaky weather providerEasyDesignDesignEasy25 minStatus page for a SaaS productEasyDesignDesignEasy25 minZero-downtime deploys for a small web appEasyDesignDesignEasy25 minUptime monitoring for small business websitesEasyDesignDesignEasy30 min

Consistency and moneyLevel 3Open topic

Seat booking for a community theaterEasyDesignDesignEasy25 minShared expenses for a group of friendsEasyDesignDesignEasy25 minCheckout for an online course storeEasyDesignDesignEasy25 minLoyalty points for a coffee chainEasyDesignDesignEasy30 minTransfers between a member's own accountsEasyDesignDesignEasy25 min

Real-time systemsLevel 3Open topic

Team presence detectionEasyDesignDesignEasy25 minVanity redirect managerEasyDesignDesignEasy25 minLive polls during a webinarEasyDesignDesignEasy25 minVirtual queue for theme park ridesEasyDesignDesignEasy30 minShared grocery list that syncs between phonesEasyDesignDesignEasy30 min