Online code editor for interviews in VS Code_

Codility Interview gives you and the candidate one shared VS Code workspace in the browser. The candidate can install packages, run tests and debug in the terminal while you watch.

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Backend engineer, live interview Shopping cart refactor · Python

codeCode

drawWhiteboard

38:12

AK TR

End interview

description search account_tree bug_report extension

Explorer

expand_moreshop-cart

expand_morefolder_opencart

py__init__.py

pycart.py

pypricing.pyM

chevron_rightfoldertests

descriptionrequirements.txt

descriptionREADME.md

pycart.pyclose

pypricing.py

pytest_cart.py

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from decimal import Decimal
from .pricing import apply_discount


class Cart:
    def __init__(self):
        self.items: dict[str, list] = {}

    def add(self, sku: str, price: Decimal, qty: int = 1):
        if qty < 1:
            raise ValueError(“qty must be positive”)
        line = self.items.setdefault(sku, [price, 0])
        line[1] += qty

    def total(self, code: str | None = None) -> Decimal:
        # fix: quantize after the discount, not before
        subtotal = sum(p * q for p, q in self.items.values())
        return apply_discount(subtotal, code)Tomás R.

ProblemsOutputTerminal bash

candidate@workspace:~/shop-cart$ pip install -r requirements.txt
Successfully installed freezegun-1.5.1 pytest-8.3.2
candidate@workspace:~/shop-cart$ pytest -q
……                                                     [100%]
6 passed in 0.24s
candidate@workspace:~/shop-cart$ 

syncLive · 2 participants Python 3.12 Ln 18, Col 47UTF-8

TR Tomás R. · Candidate

AK Anna K.

mic videocam

chat call_end

Rated by users on G2

Codility is rated 4.6 out of 5 on G2 and ranked #1 for Enterprise Technical Skills Screening. Rankings come from verified customer reviews.

Today’s failing approach: a basic code pad for the live interview

terminal

Challenge 1

No terminal for project tests

If your current editor lacks a terminal or package installs, candidates may have to run project tests elsewhere. You cannot watch those test runs in the shared workspace.

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Challenge 2

No prompt record in the code pad

When a candidate uses an AI tool in another window, the code pad itself gives your team no prompt record to review.

sticky_note_2

Challenge 3

Only final code and notes

If your current setup saves only the final code and each interviewer’s notes, you have no shared session record to check when interviewers disagree.

Run the live interview in a shared VS Code workspace

Codility Interview is a live technical interview platform for engineering teams. The candidate does not need to set up a local development environment. Your team brings its own tasks and rubric, and Codility provides the environment and the session record.

Give candidates a terminal, packages and autocomplete

Codility Interview runs VS Code with a terminal, dependencies and autocomplete.
The candidate can work across several files while you follow each change.
Your interviewers can attach databases to the workspace for a backend task, including MongoDB, PostgreSQL, MySQL and Redis.

The difference: You see how the candidate reads an error and fixes it, as well as the final code.

Shopping cart refactor 41:06

pycart.py

pytest_cart.py

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def test_discount_rounding():
    cart = Cart()
    cart.add(“SKU-7”, Decimal(“19.99”), qty=3)
    assert cart.total(“SAVE10”) == Decimal(“53.97”)

ProblemsTerminalbash

candidate@workspace:~/shop-cart$ pytest -q
F…..                                    [100%]
FAILED tests/test_cart.py::test_discount_rounding
  AssertionError: Decimal(‘53.96’) != Decimal(‘53.97’)
1 failed, 5 passed in 0.27s
candidate@workspace:~/shop-cart$ pytest -q
……                                    [100%]
6 passed in 0.24s
candidate@workspace:~/shop-cart$ 

6 tests passingPython 3.12

TR

Tomás ReyesBackend engineer · Live interview · 52 min

Completed

SummaryCode playbackAI activityRubric

AI Assistant Enabled for this assessment 4 interactions

12:41chatAI Assistant

TRWhy would Decimal sums come out one cent off after applying a percentage discount?

auto_awesomeRounding is applied before the discount, so the error compounds. Quantize the final amount once, after the discount.

18:05terminalClaude Code · terminal

TRWrite a pytest case for a 10% code on three items priced 19.99.

auto_awesomeAdded test_discount_rounding to tests/test_cart.py with an expected total of 53.97.

Show 2 more interactionsexpand_more

Turn the AI Assistant on or off, then review the prompts

Your team enables or disables the AI Assistant per assessment.
When your team enables the AI Assistant, Codility captures every candidate interaction with the assistant as reviewable AI activity.
Where your account enables Claude Code, candidates can run Claude Code in the same terminal. Codility saves those Claude Code interactions to the candidate report.

The difference: You judge how the candidate works with AI from the session record.

Score each interview against a shared rubric

Your interviewers score the session against the criteria your team sets in a shared rubric.
When available, recordings, transcripts and session replay let your interviewers revisit the session and check the candidate’s reasoning.

The difference: Interviewers who disagree can compare their rubric scores in the candidate report before the hiring decision.

Request a free trial

TR

Tomás ReyesBackend engineer · Live interview · 52 min

Completed

SummaryCode playbackAI activityRubric

CriteriaAKAnnaJPJon

Problem solving

Code quality

Testing and debugging

Use of AI tools

Communication

play_arrow

21:48 / 52:10

Test failedAI promptTests passing

Questions about online code editors for interviews

What is an online code editor for interviews?

An online code editor for interviews is a browser-based editor where an interviewer and a candidate write and run code together during a live technical interview. Codility Interview provides that editor as a shared VS Code workspace with a terminal.

Is there a free online code editor for interviews?

What should an online coding editor include for interviews?

Do candidates need to install anything?

Do we still need a separate video call?

Can one session cover coding and system design?

Can the interviewer see integrity signals during the session?

Can we use our own interview tasks?

Does Codility make the hiring decision?

Try the workspace with a task you already use_

Bring a coding task from your current interviews and run it in the shared VS Code workspace.

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