CrackingWalnuts
The bar at Senior is not the bar at Staff, and generic prep trains you for neither. Your roadmap names the rounds you will face, the weight each one carries, and the depth graders expect, so every hour goes where the decision is made. One payment, every lesson, no auto-renew.
The 4–10 weeks before your interview: follow the roadmap for your level, study the highest-priority topics first, and skip material your interview will not test.
Before each interview round: practise system design, coding, low-level design, and behavioral follow-ups at the depth expected for your level.
After you join: learn the databases, distributed systems, AI, security, Linux, DevOps, and performance topics behind the work you now own.
When you prepare for the next level: build depth in architecture decisions, incidents, engineering metrics, platform engineering, leadership, and org design.
One payment unlocks every Premium track and update released during your 12 months.
Prepare for the interview. Keep it for the engineering work and the next level.
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One-time payment · 12 months of access · no automatic renewal
Every track has a free flagship lesson and a preview of every other lesson. Run the real thing first.
One payment for 12 months. It never auto-renews. When it ends we just remind you.
New tracks and features ship all year, and they're yours while your plan is active.
A clean box diagram feels like understanding. That feeling holds until the first follow-up question, or the first deployment under real traffic. Here is one question, three levels deep.
“How would you scale reads?”
Add a read replica.
“A user writes, then reads a second later. What do they see?”
Maybe the old value. The replica trails the primary by the replication lag.
“How wide is that window, and how do you keep the user out of it?”
Read-your-writes: pin that session to the primary until the write lands, or route by a session token. Now you can defend it.
Most answers stop at the first question. Interviews and incidents are both decided at the third.
AI can emit the first answer in seconds. It cannot defend the third. That is what moved the bar, and it moved at every level: an entry-level interview and a staff design review now ask the same follow-up.
When first answers are free, the engineers who can defend the third are the hardest to replace.
Live counts, straight from the platform, from your first interview to leading an org.
9 tracks · 667 lessons
2 tracks · 167 lessons
2 tracks · 184 lessons
12 tracks · 1,136 lessons
7 tracks · 347 lessons
30+ tracks, 2,500+ lessons and playbooks, and every update released during your 12 months. One payment of $65, with no automatic renewal.
One-time payment · 12 months of access · no automatic renewal
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