Omne Ignotum Pro Magnifico

Interview Handbook
Interview preparation for technology geeks

Walk into the loop knowing exactly what comes next.

Clear walkthroughs for coding rounds, system design, CS fundamentals, AI and ML. Everything you need to prepare, in one handbook.

two_sum.py
# One pass, O(n) time, O(n) space
def two_sum(nums, target):
    seen = {}
    for i, n in enumerate(nums):
        need = target - n
        if need in seen:
            return [seen[need], i]
        seen[n] = i
Why a hash map beats nested loops, and how to say it out loud.
Six tracks

Prepare for every round of the loop

Coding

Arrays, graphs, dynamic programming and more. Each problem comes with the pattern, a brute force, the optimal solution and the follow-ups interviewers like to ask.

Browse problems →

System design

A repeatable framework for open-ended questions: requirements, estimates, data model, scaling and trade-offs, applied to classic designs.

Browse designs →

CS theory

Operating systems, networks, databases and concurrency, explained at the depth interviewers actually probe.

Browse concepts →

AI

LLMs, prompting, retrieval and agents: the concepts and system questions that now show up in modern engineering interviews.

Browse AI topics →

Machine learning

Core algorithms, model evaluation, bias and variance, and how to talk through an ML system design from data to deployment.

Browse ML topics →

Design patterns

Creational, structural and behavioral patterns with real code, plus low-level design questions that ask you to apply them.

Browse patterns →
Latest posts

Fresh from the blog

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Study roadmap

A simple order to follow

01

Learn the patterns

Two pointers, BFS/DFS, heaps, DP. Patterns beat memorising problems.

02

Practise out loud

Talk through your approach, complexity and edge cases as you code.

03

Add system design

Use one framework on several classic designs until it feels natural.

04

Mock and review

Run timed mocks, then write down what slipped and fix that first.

One problem, one design, one concept. Every week.

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