Take the page.
A SEV-1 plays out in the incident channel and you make the calls: what to check, what to roll back, what to tell customers. The company and people are fictional; each night is modelled on a real public postmortem, named at the end. Good practice for on-call and for the “tell me about an incident” interview question.
29 war rooms · 8–15 minutes each · read the true stories →
29 rooms
- SEV-1 · 23:23 · Setu Cloud+60 xpA blank field crashes every regiona public cloud whose APIs serve 2 lakh businesses in 30 regionsProduction Readiness~13 min · 5 calls
- SEV-1 · 06:40 · Nidhi Pension Trust+60 xpBoth regions deleted at oncea retirement fund's member systems for 6 lakh members, on a cloud provider's private cloud in two regionsData at Scale~13 min · 5 calls
- SEV-1 · 09:48 · Pankh Airways+60 xpEvery screen at the airport turned bluea domestic airline flying 400 flights a day from 30 Indian airportsProduction Readiness~13 min · 5 calls
- SEV-1 · 19:15 · Prism Edge+60 xpEvery website behind us is down at oncea CDN and web firewall in front of 40,000 websitesProduction Readiness~12 min · 5 calls
- SEV-1 · 09:03 · Sandesa+60 xpFirst Monday after the holidaysa workplace chat app used by 2 lakh companiesProduction Readiness~13 min · 5 calls
- SEV-1 · 04:24 · Kodeghar+60 xpForty-three seconds, two versions of the trutha code-hosting platform for 4 million developersConsistency and Coordination~14 min · 5 calls
- SEV-1 · 18:45 · Dhara Cloud+60 xpMore servers made it worsea managed event-streaming service that 30 other services in the region build onProduction Readiness~13 min · 5 calls
- SEV-1 · 23:07 · Tijori Cloud+60 xpOne typo takes out a storage regionan object-storage service whose Mumbai region holds files for 30,000 appsProduction Readiness~13 min · 5 calls
- SEV-1 · 09:38 · Lakshya Broking+60 xpPrices froze on the phone, not on the weba stock broker's trading app and website used by 1.5 crore clientsReal-Time Delivery~11 min · 5 calls
- SEV-1 · 11:42 · Sangam Payments Exchange+60 xpStatus checks flood the payment switcha real-time payment switch between 300 banks and 50 payment appsData at Scale~12 min · 5 calls
- SEV-1 · 16:20 · Nirmaan CI+60 xpTell every customer to rotate every secreta build-and-deploy service that stores secrets for 80,000 software teamsMulti-tenancy and Security~13 min · 5 calls
- SEV-1 · 18:10 · Khelverse+60 xpThe address book that won't heala game platform with 9 million players a dayConsistency and Coordination~14 min · 5 calls
- SEV-1 · 21:10 · Baatcheet+60 xpThe backbone goes dark, and takes our name with ita messaging and social app used by 300 million peopleFoundations~13 min · 5 calls
- SEV-1 · 19:32 · Baithak+60 xpThe cache went cold at peak houra team chat app used by 1.5 crore people at workCaching~12 min · 5 calls
- SEV-1 · 13:33 · Kaamkaaj+60 xpThe clean-up script deleted 883 customers' sitesa work-tracking and wiki suite used by 2 lakh teamsMulti-tenancy and Security~14 min · 5 calls
- SEV-1 · 17:28 · Patra+60 xpThe database ran out of numbersa transactional email API that sends OTPs, receipts and alerts for 40,000 appsFoundations~13 min · 5 calls
- SEV-1 · 09:16 · Sutradhar Securities+60 xpThe eighth server kept the old codea broker's order router that sends retail orders to the stock exchangeProduction Readiness~12 min · 5 calls
- SEV-1 · 12:20 · Varsha Cloud+60 xpThe endpoint with no addressa public cloud whose Mumbai region hosts a managed key-value database used by most of its servicesFailure-First Design~14 min · 5 calls
- SEV-1 · 10:08 · Sagar Stock Exchange+60 xpThe exchange that lost its risk feeda stock exchange and its clearing corporation, handling crores of trades a dayProduction Readiness~13 min · 5 calls
- SEV-1 · 15:12 · Pravah Networks+60 xpThe failsafe that sent everythinga CDN that delivers request logs to 20,000 customers' own storageMessaging and Async Processing~12 min · 5 calls
- SEV-1 · 16:52 · Kavach Edge+60 xpThe feature file that doubleda CDN and bot-protection network in front of 1 lakh websitesProduction Readiness~13 min · 5 calls
- SEV-1 · 17:16 · Dhruv Networks+60 xpThe high-availability cluster that wasn'ta CDN whose dashboard, API and analytics run from three data centres near PuneFoundations~13 min · 5 calls
- SEV-1 · 21:02 · Megh Cloud+60 xpThe retries that jammed the bridgea public cloud whose Mumbai region runs 50,000 customers' workloadsFailure-First Design~13 min · 5 calls
- SEV-2 · 22:40 · Charcha+60 xpThe rollback DNS wouldn't forgeta workplace chat app used by 80 lakh peopleFoundations~12 min · 5 calls
- SEV-1 · 22:06 · Rokda Pay+60 xpThe rollback that broke it againa payments API that 60,000 Indian businesses use to take card and UPI paymentsConsistency and Coordination~13 min · 5 calls
- SEV-2 · 19:34 · Mandi Pay+60 xpThe root certificate that expired on schedulebilling handhelds and a payments API used by 1.2 lakh small shopsexpired certificatesStandard~12 min · 5 calls
- SEV-2 · 05:40 · Nakshatra Edge+60 xpThe second that happened twicea DNS and CDN provider answering for 2 lakh domainsFailure-First Design~11 min · 5 calls
- SEV-1 · 11:33 · Nigrani+60 xpThe update nobody scheduleda monitoring service used by 25,000 companies, running in five regions on three cloudsFoundations~13 min · 5 calls
- SEV-1 · 05:04 · Shakha+60 xpThe wipe ran on the primarya code-hosting service for 1.5 million developersData at Scale~13 min · 5 calls