Technical Interview Preparation: A Practical Checklist
Updated 6 October 2026 · 8 min read
Technical interviews vary a lot between companies, but most processes combine a few of the same building blocks: a screening call, a coding exercise, a deeper technical conversation and a culture or team interview. Preparing for each block separately is far more effective than “studying everything”.
1. Find out the format before you prepare
It is completely normal to ask the recruiter what the stages look like, how long they take and which language you can use. A take-home assignment, a live coding session and a pair-programming exercise need different preparation. Companies are usually happy to share this — they want you to perform well.
2. Coding exercises: practise thinking out loud
Interviewers care as much about how you approach a problem as about the final answer. Practise explaining your thinking while you code: restate the problem, ask about edge cases, propose a simple solution first, then improve it.
- Review core data structures: arrays, hash maps, sets, stacks, queues, trees
- Be comfortable with sorting, searching, recursion and basic complexity (Big-O)
- Practise on a plain editor without autocomplete at least a few times
- Write small tests or walk through examples by hand before saying you're done
3. Take-home assignments: treat them like production code
Clear structure, meaningful names, a short README and a few tests make a stronger impression than extra features. Explain the trade-offs you made and what you would do with more time. Respect the suggested time box — reviewers notice when an assignment was clearly over-engineered.
4. System design (mid-level and senior roles)
Design rounds test whether you can reason about larger systems. Use a consistent approach: clarify requirements and scale, sketch the main components, define the data model and APIs, then discuss bottlenecks, caching, failure handling and monitoring. There is rarely one correct answer; the discussion of trade-offs is what is being evaluated.
5. Talk about your own experience in depth
Expect questions like “Tell me about a technical decision you'd make differently today” or “Describe a production incident you handled”. Prepare three or four stories from your work using the STAR structure — Situation, Task, Action, Result — and be ready to go into technical detail on each.
6. Prepare questions for them
Good questions show seniority and help you decide whether you want the job.
- How do you deploy, and how often?
- How is on-call organised, and how many incidents happen in a typical month?
- How are technical decisions made and documented?
- What would success look like in this role after six months?
7. After the interview
Send a short thank-you message, and if you didn't get the job, politely ask for feedback. Write down the questions you were asked while you still remember them — your notes become the best preparation material for the next interview.