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Security and privacySystem design · Level 2Open topic

Access rules for a school grade bookEasyDesignDesignEasy25 minSigned webhooks for an invoicing APIEasyDesignDesignEasy25 minEncrypting answers on a clinic intake formEasyDesignDesignEasy30 min

Search and feedsSystem design · Level 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 analyticsSystem design · Level 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 failoverSystem design · Level 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 moneySystem design · Level 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 systemsSystem design · Level 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

ML systemsSystem design · Level 4Open topic

Review sentiment scores for sellersEasyDesignDesignEasy25 minSimilar recipes shelfEasyDesignDesignEasy25 minSpam filter for a hobby forumEasyDesignDesignEasy25 minSpending categories in a budgeting appEasyDesignDesignEasy25 minPrice suggestions for secondhand listingsEasyDesignDesignEasy30 min

AI in the systemSystem design · Level 5Open topic

Price a meeting notes summarizerEasySystem design with AI partsSystem design with AI partsEasy20 minPrice an overnight archive classifier on the batch APIEasySystem design with AI partsSystem design with AI partsEasy20 minSuggested replies for a help deskEasyDesignDesignEasy25 minChapter markers for recorded lecturesEasyDesignDesignEasy30 minAlt text drafts for uploaded imagesEasyDesignDesignEasy25 minHelp center answer botEasyDesignDesignEasy30 minReceipt scanning for expense reportsEasyDesignDesignEasy25 min

Arrays and stringsCoding · FoundationsOpen topic

Three-way partition by pivotEasyWrite codeWrite codeEasy15 minAdd two large numbers stored as digit listsEasyWrite codeMicrosoft styleWrite codeMicrosoft styleEasy10 minEvaluate a postfix expression from a calculatorEasyWrite codeBloomberg styleWrite codeBloomberg styleEasy12 minQuery string encodingEasyWrite codeStripe styleWrite codeStripe styleEasy15 minCheck whether a stack can produce a pop orderEasyWrite codeWrite codeEasy15 minPath prefix routingEasyWrite codeWrite codeEasy15 minCheck whether a phrase reads the same backwardsEasyWrite codeMeta styleWrite codeMeta styleEasy10 minApply a flash sale price cap to a cartEasyWrite codeWrite codeEasy10 minZero the stock counts of recalled pallet slotsEasyWrite codeWrite codeEasy10 minShow the best price still to comeEasyWrite codeWrite codeEasy10 min