How to Prepare for a Technical Interview Without Burning Out
A realistic 6-week preparation plan for technical interviews at product companies, scoped for people with full-time jobs.
What technical interviews actually test
Most technical interview loops have four components: a coding round (data structures and algorithms), a system design round, a behavioural round, and one or more deep-dive rounds on your past work. You don't need to be world-class at any single one; you need to be solidly above the bar at all four.
Week 1–2: foundations
Spend 60–90 minutes a day on coding fundamentals. Focus on patterns, not problems: two pointers, sliding window, BFS/DFS, recursion, dynamic programming, binary search. NeetCode's roadmap or the LeetCode 75 list is enough — don't try to grind 500 problems.
For each pattern, solve 5 problems by hand, talk through your reasoning out loud, then watch a walkthrough. The goal is to recognise the pattern in 60 seconds, not memorise the solution.
Week 3–4: system design
System design is a learnable skill, not a creative leap. Read System Design Interview by Alex Xu and watch the ByteByteGo YouTube channel. For each of the canonical questions (design Twitter, design a URL shortener, design a chat app), write out the full design once on paper before checking the solution.
The structure that works in 99% of interviews: clarify requirements, estimate scale, propose an API, sketch the high-level architecture, deep-dive on one component, discuss bottlenecks and trade-offs.
Week 5: behavioural
Write out six STAR-format stories that cover: shipping under deadline, handling conflict, technical disagreement, mentoring, failure, and ambiguity. Practise telling each one in under three minutes. The same six stories will answer 90% of behavioural questions.
Week 6: mock interviews and recovery
Do at least three mock interviews on Pramp or with a friend. Record yourself. The first one will be ugly — that's the point. Take the last 48 hours before the real interview almost completely off. Sleep, exercise, light review only.
On the day
Talk through your thinking constantly. Interviewers can't read your mind, and silence is the most common reason strong candidates fail. If you get stuck, say so out loud and explain what you'd try next. Asking good clarifying questions in the first two minutes is often more valuable than a perfect solution.