Hello Interview

Where top software engineers prepare for interviews

[Hello Interview @_hellointerview]

Interviewers want to watch you draw connections and reason about tradeoffs, which you can do without having run the thing in production: https://t.co/F1NM5H3ssJ

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Your hands-on experience with a technology usually lags what you know about it, and pretending otherwise is far more damaging than saying so.

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Full breakdown of consumer groups, partitioning, and workflows: https://t.co/pHzOEKr5ZB

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One event needs to hit billing, analytics, and 3 other services. Spinning up a queue per consumer duplicates the message everywhere. Use one Kafka topic with a consumer group per service; each one reads the same log at its own pace.

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The cost is real: every consumer has to handle duplicate events idempotently, and any schema change needs sign-off from every downstream team.

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The full session: https://t.co/WLz7YGMS06

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A recording of a real senior system design interview, anonymised and shared with the consent of both the candidate and the interviewer. The problem is designing an e-commerce platform.

[Hello Interview @_hellointerview]

Worth watching for what a write-up cannot show: where the interviewer interrupts, which assumptions get challenged, and how the candidate recovers.

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The full advice: https://t.co/yr5l6Ylgf2

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The things that got you to senior are not the things that get you past it. More execution on well-defined work is the trap.

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What moves people is zooming out for company context, scaling yourself through projects other engineers run, and sometimes a team change to build the leadership perception you do not currently have.

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Gilad and Stefan on the red flags and how to navigate the loop: https://t.co/GqUjAD0xMf

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In manager interviews it is easy to open a negative assumption in your interviewer's head without noticing, usually by describing what you did and never why.

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Full breakdown: https://t.co/xxMOxUlmpc

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A single Redis node handles ~100k requests/sec. One celebrity tweet blows past that, and now every read hits the same key on the same node.

[Hello Interview @_hellointerview]

Shard splitting fixes the root cause when a physical node is the bottleneck, but it's operationally painful. Reach for it last, after replicas and key copies fall short.

[Hello Interview @_hellointerview]

The whole conversation: https://t.co/YBzlHKnQG9

[Hello Interview @_hellointerview]

Stefan talks to Jordan, who runs Jordan Has No Life, about how he actually learned system design and why personal projects taught him more than reading did.