The technical interview, prepared for deliberately: data structures and algorithms by pattern, problems in a sensible order, system design and behavioural rounds.
Finish this and you can solve medium problems in under thirty minutes while explaining your reasoning, and tell your own stories with evidence.
If you never took the course, take it now: the ideas every problem set assumes.
Foundation
Harvard University · course · 50 h
The most loved introduction to programming and computer science, with excellent problem sets.
VisuAlgo · interactive · 4 h
Watch data structures and algorithms run step by step. Use it whenever an idea will not click.
Practitioner
MIT OpenCourseWare · course · 40 h
Rigorous lectures on the core algorithms and how to analyse them.
Two pointers, sliding windows, graphs, dynamic programming: learn the pattern, then the problems that use it.
Foundation
bigocheatsheet.com · docs · 20 min
The complexities you should be able to state without thinking.
Practitioner
NeetCode · interactive · 50 h
A dependency graph of patterns with free video explanations for every problem.
LeetCode · interactive · 50 h
Where you practise. Time yourself, and write the complexity before you submit.
Project
Practice that compounds.
Résumés, recruiter screens, the rounds, the offer: what happens and how to prepare for each step.
Foundation
techinterviewhandbook.org · docs · 10 h
A free, complete guide to the process, from résumé to negotiation.
For mid-level and above: a structured approach to designing a large system out loud.
Practitioner
GitHub · repo · 15 h
Concepts plus worked interview questions with solutions.
Stories with evidence: what you did, what changed, and what you learned.
Foundation
techinterviewhandbook.org · article · 1 h
Common questions, the STAR structure, and what interviewers are actually listening for.
Project
Write eight stories from your own work: a conflict, a failure, a decision with little data, leading without authority, and four of your best results. Each in STAR form with a number in the result. Then practise them out loud in CareerOS Interview practice and keep the scores.
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