Course contents

High-Level Design Interview Prep

01The HLD interview
Module overview
1. The round
02Core concepts
Module overview
03Networking and APIs
Module overview
04Data and storage
Module overview
05Caching fundamentals
Module overview
1. Caching
06Messaging and streams
Module overview
1. Queues and topics
2. Data in motion
07Distributed coordination
Module overview
1. Agreeing and finding each other
2. Transactions and ordering
08Running in production
Module overview
09Security
Module overview
1. Identity and access
2. Protecting data
10Architecture styles
Module overview
1. Architecture styles
11System design trade-offs
Module overview
1. Trade-offs
12Key technologies
Module overview
13Common patterns
Module overview
1. Patterns
14Infrastructure
Module overview
1. Design problems
15Search & discovery
Module overview
1. Design problems
16Storage & media
Module overview
1. Design problems
17Social & feeds
Module overview
1. Design problems
18Real-time & collaboration
Module overview
1. Design problems
19Location & maps
Module overview
1. Design problems
20E-commerce & booking
Module overview
1. Design problems
21Payments & fintech
Module overview
1. Design problems
  1. Design a payment system
  2. Design a double-entry ledger
  3. Design a digital wallet
  4. Design a stock exchange
  5. Design a brokerage app (Robinhood)
22Data, analytics & monitoring
Module overview
1. Design problems
23Developer platforms
Module overview
1. Design problems
24AI & LLM systems
Module overview
1. Design problems

Module 21

Payments & fintech

Moving money correctly: payments, ledgers, wallets and trading.

Premium0 free lessons1 topics5 problems0 ready

Design problems

Moving money correctly: payments, ledgers, wallets and trading.

Design a payment systemHardDesign problemPremiumSoon
Design a double-entry ledgerHardDesign problemPremiumSoon
Design a digital walletMediumDesign problemPremiumSoon
Design a stock exchangeHardDesign problemPremiumSoon
Design a brokerage app (Robinhood)HardDesign problemPremiumSoon