Where top software engineers prepare for interviews
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Your Kafka cluster has spare capacity, but one partition is drowning in traffic. Adding brokers won't spread a single hot key across them. Look at your partition key.
The full deep dive, including how the internals should shape your own design: youtube.com/watch?v=PuZvF2Ey…
Read replicas and Redis are the two everyone names. They are not interchangeable and they do not solve the same problem.
A pure hash is deterministic, so the same URL always yields the same code. You get free deduplication and guessable codes in the same move, which is what the salt is for: youtube.com/watch?v=iUU4O1sW…
Ranking millions of players in real time is brutal in SQL. Redis sorted sets keep the ranking live: O(log n) to insert a new score, O(log n) to fetch rank, instant top-N reads.
You can set AOF to fsync on every write, and almost nobody does because it costs exactly the speed they picked Redis for. MemoryDB sells some of that speed back for real disk durability: youtube.com/watch?v=fmT5nlEk…
Task work suits Rabbit. Send this email, resize this image, one unit of work picked up once. Event streams suit Kafka, where several consumers read the same log at their own pace: youtube.com/watch?v=1HOVtQ-_…
PostgreSQL can do full-text search and store searchable JSON. Before adding a second database to your design, check what the first one already supports.
Steering them there without taking over the interview is the skill: youtube.com/watch?v=8Pls8YVR…
Knowing which one a question is aimed at changes the story you reach for: youtube.com/watch?v=ozIjy8J2…
How to handle a bad interviewer without losing the loop: youtube.com/watch?v=MqQrnxFP…
