Largest Rectangle in Histogram

Optimistic vs pessimistic (the one-sentence answer)

Preventing deadlocks with pessimistic locking

The conditional write is already safe

Isolation levels (REPEATABLE READ won't save you)

Daily Temperatures

Scaling Writes: Part 4 of 4 — Batching & Aggregation

Scaling Writes: Part 3 of 4 — Queues & Load Shedding

Scaling Writes: Part 2 of 4 — Sharding & Partitioning

Scaling Writes 1: Part 1 of 4 — Vertical Scaling & Database Choice

How to Design ChatGPT

CAP theorem in system design interviews

Kafka in 60s

4 ways to push real-time updates to clients. Most engineers only know 1.

Why System Design Interviews Ask You to Count Billions of Users Without a HashSet

Network Delay Time | Dijkstra's algo

Bloom Filters: Why They Allow False Positives But Never False Negatives

One ad goes viral and takes down your database — here's the fix

Minimum Window Subsequence | DP | Hard

Database transactions explained

Jump Game | Greedy

REST vs GraphQL vs gRPC: Which API wins in system design interviews?

Cursor pagination

YouTube Upload

Longest Valid Parentheses | Hard

Why your upload server should never touch the file bytes

Distributed transactions

4 Ways to Fix Cache Stampede

Paint House | Dynamic Programming | Hello Interview

B-tree vs LSM tree: which database index wins for your workload?

5 ways to scale reads. Most engineers only know 2.

Word Search Explained: Backtracking Is Just Two Lines of Code

How Instagram handles celebrities with 500M followers without melting their servers

Partition Equal Subset Sum Explained | Dynamic Programming (Subset Sum Pattern)

Most engineers get this wrong in an interview

Maximum Profit in Job Scheduling | Dynamic Programming Explained

What interviewers actually expect at mid-level vs senior vs staff engineer

Longest Increasing Subsequence | Dynamic Programming Explained

Maximal Square DP in under 60 seconds

How Slack scaled MySQL to 1.5 billion messages a day

Dynamic Programming in under 60 seconds

Intervals most important patterns

Binary Trees in under 60s

ACID Databases

Scaling reads in a distributed system

Consistent hashing in under 60s

"Give an Example of Critical Feedback You Received"

Top 3 database Indexes every engineer should know