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Full-Stack Engineer mock interview

Builds features across the whole web application, from the database and server to the user interface. Day to day they ship end to end features, move between frontend and backend code, and keep the product working smoothly in production. Interviewers usually probe how you actually do these things, so expect follow-up questions.

Ava, the AI interviewer, will ask you questions on frontend development, backend & api development, data modelling & databases and end-to-end feature delivery and 4 more skills, follow up on what you say, and finish with a report that quotes your own words back to you.

Start a full-stack engineer practice interview

Skills assessed in a full-stack engineer interview

  • Frontend development

    Role skill

    Builds interfaces with a modern framework, handles loading and error states, and keeps client state in sync with the server.

  • Backend & API development

    Role skill

    Designs endpoints clearly, handles authentication and validation correctly, and understands the request lifecycle end to end.

  • Data modelling & databases

    Role skill

    Designs relational schemas with sensible keys and relationships, writes efficient queries, and plans migrations.

  • End-to-end feature delivery

    Role skill

    Breaks features into shippable slices, makes pragmatic decisions at each layer, and owns the result through launch.

  • Testing & debugging across the stack

    Role skill

    Narrows problems layer by layer using network tools, logs and tests, and writes tests at the right level.

  • Deployment & cloud basics

    Role skill

    Understands pipelines, environments, feature flags and gradual rollouts, and can operate what they ship.

  • Product thinking

    Behavioural

    Asks what problem a feature solves, suggests simpler ways to deliver value, and looks at usage after launch.

  • Communication

    Behavioural

    Keeps product and design partners informed early, explains trade-offs plainly and flags risks before they become surprises.

Sample full-stack engineer interview questions

8 of the 13 questions Ava can ask for this role, one or more per skill. In a real session she adapts them to your level and follows up on your answers.

  1. Q1Frontend developmentEntry level

    Walk me through how you would build a page that shows a list of items from a server, including what the user sees while it loads.

    A strong answer: Fetching data, loading, empty and error states, rendering the list efficiently, and pagination or infinite scroll for large lists.

  2. Q2Backend & API developmentEntry level

    What happens, step by step, when a user submits a sign-up form on a website, from the browser all the way to the database?

    A strong answer: Client validation, the request to the server, server validation, password hashing, saving to the database, handling duplicates, and returning a response or session.

  3. Q3Data modelling & databasesEntry level

    If you were storing users, their posts and comments on those posts, how would you set up the tables and relationships?

    A strong answer: Separate tables with primary and foreign keys, one to many relationships, sensible indexes, and thinking about deletes.

  4. Q4End-to-end feature deliveryMid level

    Tell me about a feature you built from the database all the way to the user interface. What decisions did you make along the way?

    A strong answer: Clear decisions at each layer with reasons, how they sliced the work, testing, rollout and what they learned after launch.

  5. Q5Testing & debugging across the stackMid level

    A user reports that saving their profile sometimes fails with no error message. How would you figure out whether it's a frontend or backend problem?

    A strong answer: Checking browser network requests and console, server logs and error tracking, reproducing with the user's data, narrowing layer by layer, and fixing the missing error message too.

  6. Q6Deployment & cloud basicsMid level

    How do your changes usually get from your machine to production, and what checks happen along the way?

    A strong answer: Pull request and review, automated tests and builds, staging or preview environments, deployment process, and monitoring after release.

  7. Q7Product thinkingAny level

    Tell me about a time you pushed back on or changed a feature request because you thought there was a better way to solve the user's problem.

    A strong answer: Understanding the underlying user need, proposing an alternative with evidence, respecting the final decision, and checking results after launch.

  8. Q8CommunicationAny level

    How do you keep product managers and designers informed when a feature is taking longer than expected?

    A strong answer: Flagging early, explaining why in plain terms, offering options like reduced scope, and agreeing a new plan.

What a strong full-stack engineer answer looks like

  • Frontend development

    Builds interfaces with a modern framework, handles loading and error states, and keeps client state in sync with the server.

  • Backend & API development

    Designs endpoints clearly, handles authentication and validation correctly, and understands the request lifecycle end to end.

  • Product thinking

    Asks what problem a feature solves, suggests simpler ways to deliver value, and looks at usage after launch.

How the practice works

  1. Step 1

    Choose your level

    Pick intern through lead. The full-stack engineer question bank is labelled for 3 entry-level, 5 mid-level and 3 senior questions (plus 2 for any level), and Ava leans toward the ones that fit.

  2. Step 2

    Answer out loud or by typing

    Ava asks 4 or 7 main questions, depending on the length you choose, such as the frontend development question above. You can also add a short coding exercise. Typing is always available if you can't speak.

  3. Step 3

    Get feedback you can act on

    Each skill is scored against the evidence you gave, with the specific points from your answers. In practice mode you also get a check against the situation, task, action and result structure, a stronger version of each answer built only from what you said, and what to practise next.

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Frequently asked questions

Which skills does the Full-Stack Engineer mock interview cover?
Frontend development, Backend & API development, Data modelling & databases, End-to-end feature delivery, Testing & debugging across the stack, Deployment & cloud basics, Product thinking and Communication. The first 6 are role skills; product thinking and communication are the behavioural part.
What kind of questions will I get?
Questions come from a bank of 13 written for this role. An entry-level one is “Walk me through how you would build a page that shows a list of items from a server, including what the user sees while it loads.” and a senior one is “You're asked to deliver a large feature in six weeks with a small team. How would you break it down and decide what ships first?”.
How will my data modelling & databases answer be judged?
Against what strong evidence looks like for that skill: designs relational schemas with sensible keys and relationships, writes efficient queries, and plans migrations. Anything you don't mention is not credited, and nothing is invented for you.
Is this useful for MERN developer or full stack developer roles?
Yes. MERN developer, full stack developer, full-stack developer and fullstack dev are treated as close to full-stack engineer, so the same skills and questions apply. You can also type any other role on the setup screen.
Is it free, and do I need an account?
Starting practice is free, and a free account is required before the interview begins. The feedback is guidance for your preparation, not a prediction of any hiring decision.

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