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Candidate experience
37:42|▶ RunSubmit
Problem
CAR-523
PR #1098
CAR / Backlog / CAR-523
tmp dirs leaking after failed runs??? disk almost full again
● In Progress

INC-3201 — got paged, execution host at 94% disk. runs failing with No space left on device.

/tmp/canary/ has 3000+ dirs from old runs that were never deleted. seems worse on high-volume days.

Workspace
solution.py
tests.py
README.md
from sandbox import create_sandbox, write_files
from sandbox import run_tests, cleanup
def execute_run(req):
sandbox = create_sandbox(req["run_id"])
write_files(sandbox, req["code"])
result = run_tests(sandbox, req["timeout"])
cleanup(sandbox)
return result
Tests 2/5
successful run returns output
cleanup after success
cleanup after timeoutSandbox dir still exists

The technical interview, rebuilt for how engineering actually works.

01

Problems built from your backlog

Connect GitHub or Jira and we recreate a real ticket or PR as a sandboxed interview problem. Candidates get the full context — no sensitive data, no access to your actual codebase.

02

A full session replay, not a score

Every edit, every AI prompt, every dead end is recorded. Hiring teams see exactly how a candidate thinks — not just whether they got the right answer.

03

Measures agency, not memorization

An unfamiliar codebase, a vague ticket, no obvious root cause — the way real work shows up. Canary scores how a candidate navigates ambiguity, uses their tools, and drives to a fix: the agency that actually predicts on-the-job performance.

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