How to Prepare for a Technical Interview

A technical interview is not only a knowledge test. Interviewers want to see how you think, how you handle problems you have not seen before, and how clearly you explain your reasoning. Preparation makes a big difference.

Week 1: Refresh the fundamentals

• Your main language: data types, collections, error handling, common built-in functions.
• Core concepts for your role — for example HTTP, REST, databases and SQL joins for backend roles; the DOM, state and rendering for frontend roles.
• Basic data structures: arrays, hash maps, stacks, queues, trees.

Week 2: Practise problem solving

Solve one or two problems a day on arrays, strings and hash maps first, then recursion and trees. For each problem:

1. Restate the problem and ask clarifying questions.
2. Describe a simple solution first, even if slow.
3. Improve it and explain the time and space trade-offs.
4. Write clean code and test it with edge cases.

Week 3: Prepare your projects and experience

Pick two or three projects you know well. For each, be ready to explain:

• The problem it solves and your role
• The architecture and why you chose those technologies
• A difficult bug or decision and how you handled it
• What you would improve now

Also prepare short stories for common behavioural questions: a conflict in a team, a mistake you made, a deadline under pressure. Use the situation–action–result format.

Week 4: Mock interviews

Practise out loud with a friend or by recording yourself. Time-box problems to 30–40 minutes. Practise thinking aloud — silence is the most common reason good candidates seem weaker than they are.

On the day

• Test your camera, microphone and internet for remote interviews.
• Keep a notebook for working through problems.
• If you are stuck, say what you are thinking and ask for a hint — that is better than silence.
• Ask the interviewer one or two thoughtful questions at the end.

Key takeaways

Revise fundamentals, practise problems out loud, prepare to discuss your own projects in depth, and do mock interviews. Clear communication is as important as the right answer.