Ola.

The rounds, as candidates describe them

1. Problem solving and data structures60 minutes of DSA.source ↗
2. LLD and HLD90 minutes with an engineering manager; full HLD plus LLD components, skeleton code, APIs and DB schemas.source ↗
3. Hiring managerBehavioural questions and offer discussion.source ↗

• Design a Notification SystemSystem design
  IP-06 · Design a Notification System →W06 · DAY 01 · Notification Platform — Problem Understanding & High-Level Design →reported in:LeetCode Discuss · Ola SDE-2 offer, July 2024 ↗
• Design an internal app to track driversSystem design
  IP-13 · Design a Proximity Service →SQ-09 · Uber →reported in:LeetCode Discuss · Ola SDE-2 offer, Nov 2021 ↗
• Design ride poolingSystem design
  SQ-09 · Uber →IP-13 · Design a Proximity Service →reported in:LeetCode Discuss · Ola SDE-2 offered (2021) ↗
• Design a Food Delivery SystemSystem design
  SQ-17 · Swiggy Food Delivery →W06 · BOSS · Food Delivery Order System →reported in:LeetCode Discuss · Ola SDE-2 offered (2021) ↗
• Design a train booking system like IRCTCSystem design
  SQ-11 · IRCTC Tatkal Ticket Booking System →LLD-05 · Design a Movie Ticket Booking System →reported in:LeetCode Discuss · Ola SDE-3, Feb 2022 ↗
• Design a Video Streaming ServiceSystem design
  SQ-06 · Netflix Streaming →SQ-19 · YouTube Video Platform →reported in:LeetCode Discuss · Ola SDE-2 interview, Aug 2022 ↗
• Design a Rate LimiterSystem design
  IP-02 · Design a Rate Limiter →W01 · DAY 03 · Rate Limiting at Scale →reported in:LeetCode Discuss · Ola Cabs SDE-II backend offer, April 2021 ↗
• Parse JSON from a URL and answer count queriesLow-level design
  no lesson for this one yetreported in:LeetCode Discuss · Ola Cabs SDE-II backend offer, April 2021 ↗

• Design a Ride-Hailing ServiceSystem design
  SQ-09 · Uber →IP-13 · Design a Proximity Service →W01 · DAY 04 · Hot Keys and Skew →
• Design surge pricingSystem design
  SQ-09 · Uber →W08 · DAY 02 · Streaming vs Batch Processing →
• Design a Proximity ServiceSystem design
  IP-13 · Design a Proximity Service →
• Design telemetry ingestion for connected electric scootersSystem design
  W08 · DAY 01 · Event Ingestion at Scale →IP-15 · Design a Metrics Monitoring and Alerting System →W08 · DAY 04 · Late-Arriving Data and Correctness →

Study path

Every lesson the questions above point to, once, in order.

1. 01IP-06Design a Notification System
2. 02W06 · DAY 01Notification Platform — Problem Understanding & High-Level Design
3. 03IP-13Design a Proximity Service
4. 04SQ-09Uber
5. 05SQ-17Swiggy Food Delivery
6. 06W06 · BOSSFood Delivery Order System
7. 07SQ-11IRCTC Tatkal Ticket Booking System
8. 08LLD-05Design a Movie Ticket Booking System
9. 09SQ-06Netflix Streaming
10. 10SQ-19YouTube Video Platform
11. 11IP-02Design a Rate Limiter
12. 12W01 · DAY 03Rate Limiting at Scale
13. 13W01 · DAY 04Hot Keys and Skew
14. 14W08 · DAY 02Streaming vs Batch Processing
15. 15W08 · DAY 01Event Ingestion at Scale
16. 16IP-15Design a Metrics Monitoring and Alerting System
17. 17W08 · DAY 04Late-Arriving Data and Correctness