Practice · Frontend developers

Frontend interviews, explained in your own voice

Frontend rounds reward people who can explain why the page behaves the way it does. Mockinto turns your résumé into a spoken interview so you can practise that explanation.

Get 10 free credits See a sample report

An example question

“A page looks fine on your laptop but the layout jumps on a slow phone. How would you find out why?”

A good answer names a few likely causes and how you would confirm each one, rather than guessing a single fix.

Example written by the Mockinto team. Your interview’s questions are written for your résumé or job description.

What you will practise

Topics that come up for frontend developers

Questions follow the skills in your résumé or the job description, so these are typical areas rather than a fixed script.

01 JavaScript fundamentals: scope, closures, the event loop
02 React or the framework on your résumé: state, effects, rendering
03 CSS layout and responsive design
04 Performance and accessibility basics
05 Working with designers and back-end teams
06 A project you are proud of, told in two minutes

How to prepare with Mockinto

Rehearse, read the report, rehearse again

How a session works

Upload your résumé as a PDF or paste the job description. Mockinto writes about 30 questions for that role, a mix of HR, experience, aptitude and technical questions, and you answer each one out loud. When you finish, you get a report with an overall score out of 100, a score for each skill and feedback on every answer.

Why out loud matters

Explaining the event loop in your head is easy. Saying it in order, without notes, is the skill the interview tests, and it improves with repetition.

Use the report

Each answer gets feedback on what worked and what to improve. Pick the two weakest answers, rewrite them in your own words, and rehearse again.

What you get back

A report on every answer

Sample report · illustrative data, not a real candidate

Overall score

68 out of 100

Role: Backend developer, fresher
Questions: 30
Built from: A sample résumé (Java, Spring Boot, MySQL)

Skill scores

Java and Spring Boot 74/100
Databases and SQL 61/100
API design 70/100

Summary. Clear on core Java and REST basics. Answers on databases stayed general: name the index or the query plan you would check. HR answers were honest but long; lead with the result. One question was skipped and scored zero.

Q1 HR Tell me about yourself. 7/10

Your answer (transcript)

“I am a final-year computer science student. I built a library management system in Spring Boot for my college, and I interned for two months at a small fintech where I wrote REST endpoints…”

What went well

Opens with who you are and two concrete projects. The internship gives the interviewer something to ask about.

What could be better

At nearly three minutes it runs long. End with one line on why this role, and cut the list of college clubs.

A model answer

I am a final-year computer science student who builds backend services. At college I built a library system in Spring Boot and MySQL, and at my internship I wrote REST endpoints for a fintech app. I want a junior backend role where I can ship APIs and learn how production systems run.

Q7 Technical How would you speed up a slow query that filters orders by customer and date? 5/10

Your answer (transcript)

“I would first check if there is an index. If not, I would add an index on the customer column. I would also try to fetch fewer columns…”

What went well

Checks indexing first, which is the right instinct, and mentions selecting fewer columns.

What could be better

Say how you would confirm the cause, for example with EXPLAIN, and consider one composite index on customer and date rather than a single column.

A model answer

I would start with EXPLAIN to see whether the query scans the whole table. If it does, I would add a composite index on customer and order date, in that order, so the filter and the sort can both use it. I would select only the columns I need, then run EXPLAIN again to confirm the plan changed.

This is a sample built by the Mockinto team from illustrative data to show the report format. It is not a real candidate’s result, and the answers are written for the example.

Questions

Frontend developers: common questions

Pricing

10 free credits at sign-up, enough to analyse your résumé and run a shorter mock interview. Then ₹10 a credit, with a 30-question interview typically about 11 credits.

See pricing

Does it include a coding exercise?

No. Mockinto is a spoken interview. It covers the explanation and discussion part of frontend rounds, not live coding.

Can it focus on React?

If React is on your résumé or in the job description, the questions will cover it. Paste a React-heavy job description for a React-heavy interview.

What browser do I need on the web?

Mockinto works in a current version of a modern browser on desktop or phone. For spoken answers, allow the microphone when your browser asks.

All practice pages · How it works

Your next interview is a rehearsal. Make it a good one.

10 free credits at sign-up: enough to analyse your résumé and run a shorter mock interview. No card, no subscription.