Prepare for a technical interview by finding out the format, building a plan around the core skills the role needs, practising problems out loud and rehearsing how you think and communicate as well as whether you reach the answer. For most engineering and analytics roles, three to six weeks of steady practice is typical if you are rusty, and one to two weeks of review may be enough if you use the skills daily. Practise thinking aloud, clarifying the problem, testing your solution and using hints well. Interviewers score your reasoning, correctness and communication, so a clear process beats a silent right answer. Also prepare for the behavioural and system design parts, which often matter as much.
The aim is not to memorise answers, but to make your thinking visible.
Know the format
Ask the recruiter what to expect. Typical stages:
| Stage | What it tests |
|---|---|
| Recruiter or phone screen | Fit, motivation, basics |
| Online assessment | Coding or SQL problems, timed |
| Technical phone or video round | One or two problems with an engineer |
| Take-home assignment | A small project over a few days |
| On-site or virtual loop | Several rounds: coding, design, behavioural |
| Hiring manager conversation | Experience, scope, fit |
For employers' view of take-homes, see take-home assignments.
A four-week plan
Week 1: Baseline and fundamentals
- Review the job description and list the core skills.
- Refresh basics: data structures, complexity, the language you will use, SQL joins and aggregates for analysts.
- Do a few problems of easy to medium difficulty and note where you struggle.
Week 2: Practice by topic
- Work through the main topics for the role, such as arrays, strings, hash maps, trees, graphs, recursion and sorting for coding; window functions and query optimisation for SQL.
- Write each solution, test with examples and note the time and space cost.
- Review what you got wrong.
Week 3: Mock interviews and design
- Do timed problems, aloud, with a friend or a mock platform.
- Practise explaining your approach before coding.
- For senior roles, practise system design: requirements, components, data model, scale, trade-offs.
Week 4: Polish and rest
- Redo problems that you found hard.
- Prepare behavioural stories. See the STAR method.
- Review the company's products and stack.
- Rest the day before.
How to think aloud
Interviewers cannot see inside your head. A reliable pattern:
- Restate the problem in your own words.
- Ask clarifying questions: input size, edge cases, constraints.
- Work through a small example.
- Outline an approach and its cost before coding.
- Write the code, narrating key choices.
- Test with the example and edge cases.
- Discuss improvements and trade-offs.
If you start coding immediately, you risk solving the wrong problem. If you go quiet, you give the interviewer nothing to score.
When you are stuck
- Say so calmly: "I'm not sure yet, let me think about a simpler version."
- Try a brute-force approach first, then improve.
- Work through a small example by hand.
- Ask for a hint. Using hints well is acceptable.
- Do not freeze or apologise repeatedly.
Interviewers often note how you respond to feedback. Adjusting your approach after a hint is a positive sign.
System design and experience rounds
For senior roles, prepare to discuss systems you have built. Be ready to explain:
- The problem and constraints.
- The architecture and why you chose it.
- Trade-offs you made and what you would change.
- Scale, reliability and monitoring.
- Your own role and decisions.
For analysts, expect to discuss an analysis end to end: the question, the data, the method, the finding and how it was used. See data analyst resume and software engineer resume.
Behavioural and values rounds
Technical roles still have behavioural rounds, and they often carry real weight. Prepare stories about collaboration, disagreement, mistakes and ownership. See the interview preparation guide and situational interview questions.
Practical details
- Choose the language you know best, if allowed.
- Learn the platform they use for coding, so the interface is not a surprise.
- Have a quiet space, a reliable connection and a working microphone. See video interview tips.
- Keep water and a notebook to hand.
What scoring looks like
Many companies use a rubric with areas such as problem solving, coding, testing, communication and collaboration. Interviewers write notes and rate each area. The final decision comes from comparing ratings. See interview scorecard templates and interview debrief meetings.
After the interview
Send a short thank-you, and write down the problems you were asked and what you would do differently. See interview thank-you email. If you do not succeed, practise on the gaps you found and try again; see reapply after a rejection.
Common inquiries regarding this topic.
How long should you prepare for a technical interview?
Three to six weeks of steady practice, an hour or two a day, is a common plan for coding interviews if you are rusty. If you work with the skills daily, one to two weeks of focused review may be enough. Tailor it to the format and the company.
Three to six weeks of steady practice, an hour or two a day, is a common plan for coding interviews if you are rusty. If you work with the skills daily, one to two weeks of focused review may be enough. Tailor it to the format and the company.
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