Interview Prep · Home

Learn it once, say it out loud, land the round.

Interactive study pages built from your 36-file curriculum. Every concept taught from scratch, anchored to systems you already run in production — Kong, Kafka, Kubernetes, Postgres, Sentinel.

Ready now — start here

📈 Complexity Analysis
Big-O from first principles: the seven curves, reading cost off code, amortized analysis, the constraints decoder ring — plus a live work calculator.
DSA · file 01 read first
🗂 Arrays, Strings & Hashing
Where the hashmap earns its O(1): contiguous memory, collisions & load factor, two pointers, sliding window, prefix sums — the highest-frequency interview topics.
DSA · file 02
🧭 Patterns Cheatsheet
The "see X → think Y" recognition table across every DSA topic, a 90-second triage script, and your prioritized 20-problem list.
DSA · file 10 pre-interview skim
🗄 Databases
B-tree indexes, joins, ACID & isolation levels, Postgres MVCC, N+1, connection pooling — the #1 fundamentals topic for backend roles.
CS Fundamentals · file 04

The 2-day battle plan (condensed)

BlockFocusPages / files
Day 1 AMDSA patterns, not problemsComplexity → Arrays & Hashing → Patterns · 4 timed problems
Day 1 PMTrees, graphs, DP recognitionmd files 04, 05, 07 · 2 timed problems
Day 1 eveCS fundamentals sweepDatabases → networking → concurrency (md files)
Day 2 AMSystem design frameworkmd files 03/01–02 · 2 paper designs
Day 2 PMYour stories + AI systemsmd 03/06, 05/03+05, story bank — out loud
Day 2 eveVideos + 2 final problemsresources shortlist · Python cheatsheet before bed
The three rules that move the needle: ① Think out loud — narrated reasoning passes rounds, silent perfection doesn't. ② When stuck, price the brute force and name the bottleneck. ③ Steer every open question to Sentinel or the 2M req/month gateway — you have production stories most 2-year engineers don't.

Full curriculum lives in output/interview-prep/ (36 files). More pages ship as you ask for them.