The Engineering Career Operating System

Your whole engineering career, one yearly plan.

The next interview will not stop at your first answer, and neither will the job. One membership covers what both keep asking: the full interview stack, real system depth, AI, security, and leadership.

Annual access

Premium · the whole platform

Prepare for the questions that come after the textbook answer.

How members use it

The week before a loop: the HLD and LLD problems interviewers repeat, DSA templates, behavioral answers tuned to what each round screens for, and company playbooks split by level.
The first month in a new role: the internals behind the systems you now own, learned before they break in production.
The step up: your first security review, your first architecture decision, your first team.

$65total / year

Less than one mock interview with a senior engineer, for the whole year.

Buy it for the next interview. Keep it for the job that comes after.

Have a coupon or gifting this? Add it at the next step.

One-time payment · 12 months of access · no auto-renew

Secure via Razorpay Instant access

Playbooks split by company and by level: an SDE-2 loop and a Principal loop prepare differently
Internals at incident depth: why fsync can lie to your database, why a Kafka rebalance stalls your consumers
The AI track as engineering: RAG pipelines, eval systems, inference costs, and the math underneath them
Code templates in Python, Go, Java, C, and C++ that run, not pseudocode
Every new feature we ship while you're a member, at no extra cost

Depth that goes beyond boxes and arrows

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.

1
“How would you scale reads?”
Add a read replica.
2
“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.
3
“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.

Everything one payment unlocks

Live counts, straight from the platform, from your first interview to leading an org.

premium tracks

2,300+

interactive lessons

code languages

∞

future updates

Interviews

9 tracks · 666 lessons

System Design Drills100LLD Problems90HLD Playbooks89Behavioral88Cheat Sheets81Company Playbooks73DSA Templates72Staff+ Interviews48Forward Deployed Engineer25

AI

2 tracks · 162 lessons

AI Engineering95Math for AI67

Security

2 tracks · 184 lessons

Security130AI Security54

Engineering

11 tracks · 949 lessons

Concurrency148DevOps Internals142Database Internals140Cryptography Internals111Linux Internals84API Design83Key Technologies60Performance Engineering57Networking & Protocols51Distributed Systems38Infrastructure35

Leadership

7 tracks · 347 lessons

Org Design64Metrics & FinOps54Leadership54Arch Decisions52Platform Engineering42Compliance41Incident Patterns40

Try before you buy

Every track has a free flagship lesson and a preview of every other lesson. Run the real thing first.

No subscription trap

One payment for 12 months. It never auto-renews. When it ends we just remind you.

It keeps growing

New tracks and features ship all year, and they're yours while your plan is active.

Unlock the whole platform today

30+ tracks, 2,300+ interactive lessons, every future feature. One payment of $65, no auto-renew.