Products · Coding assessments

Good code needs good judgment.

Candidates build a solution in a real editor, check it against expected behavior, and explain their choices in an AI debrief. You set the rules for AI assistance before they begin.

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See how engineers build, test, and explain.

A correct answer is the start. The reasoning behind it is the signal.

rolling_limit.py Language Python

from collections import defaultdict
class RollingLimit:
def __init__(self, limit, window):
self.limit, self.window = limit, window
self.events = defaultdict(list)
def allow(self, key, now):
live = [t for t in self.events[key]
if t > now - self.window]
self.events[key] = live
if len(live) >= self.limit:
return False
live.append(now)
return True

5 behavior checks

5 of 5 checks passed

✓allow("a", 0) → true
✓allow("a", 1) → true
✓allow("a", 2) → false
✓allow("b", 2) → true
✓allow("a", 1000) → true

AI voice debrief

Review the whole picture

Ratings tied to the code and the conversation.

See competency ratings and the evidence behind them in one scorecard, next to the code and the debrief.

Behavior checks, not just a final answer
Ratings against explicit criteria
The candidate's explanation alongside the code

Overview Profile Scorecards (2) Transcript

UNIFIED SUMMARY

ASSESSMENT 1

0.0

Advance

ASSESSMENT 2

0.0

Advance

Strengths

Clean code structure
Tested edge cases
Well-structured documentation

COMPETENCY SCORES

Problem Solving

4.3

Analytical Thinking

4.1

Communication

3.7

Code and reasoning

What the code says, and what they said.

The debrief ties each decision in the code to the candidate's own explanation, so reviewers can tell real understanding from a lucky pass.

Backend engineer / Event deduplication Illustrative

function dedupeEvents(events) {1  const latest = new Map();  for (const e of events) {    const key = `${e.userId}:${e.type}`;    const prev = latest.get(key);2    if (!prev || e.at > prev.at) {      latest.set(key, e);    }  }  return [...latest.values()]3    .sort((a, b) => a.at - b.at);}

Debrief

1
Why a map?
One pass, and I keep only the newest event for each user and type.
2
Two events at the same time?
Right now the first one wins. If order matters, I'd break ties on the event id.
3
Why sort at the end?
Callers expect time order, and the map doesn't keep it.

Common Questions

Coding assessment questions

Which programming languages are supported?

Common languages, such as Python, JavaScript, TypeScript, Java, and Go. We match the task to the language your team actually works in.

Can candidates use AI tools during a coding assessment?

You decide. Set the rules before candidates begin, from no AI help at all to an AI assistant built into the task. If directing AI is part of the job, you can assess how well candidates use it and check its output.

How is this different from an automated coding test?

An automated test checks whether the final code passes. Frontstage also shows how the candidate got there: the checks they ran, the trade-offs they made, and how they explain their decisions in the debrief.

Does the AI score the code on its own?

No. The AI runs the debrief and organizes the evidence. Your team reviews the ratings against explicit criteria and makes the decision.

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