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Task

Fix Connection Pool Exhaustion Under Load

Candidate: Sample Candidate

81
/100
Grade AStrong
22m 14s
Time
12
AI Prompts
14/15
Tests
3
Files Modified

Dimension Overview

Task DecompositionPrompt SpecificityHallucination DetectionVerification DisciplineCode QualityDiagnostic SkillAI CollaborationAutonomyEfficiencyProblem Solving

Dimension Breakdown

Key Moments Timeline

How the candidate approached the problem, step by step. 🎯 Hiring Signal = moments that strongly predict engineering effectiveness in production.

0:00Session started

Explored file tree, opened 4 files before first action

2:14Read error handler code

Opened main.go and handler.go, scrolled through connection pool logic

4:30First AI prompt

"Explain the connection pool lifecycle in this codebase and where leaks could occur"

7:45Identified root cause

Found pool exhaustion under load — connections not being returned on error paths

9:10AI suggested fix

Asked AI to generate a defer-based connection release pattern

12:20Caught AI error🎯 Hiring Signal

AI suggested releasing connection twice — candidate spotted the double-free bug and corrected it

15:00Ran tests

13/15 passing — identified 2 edge cases still failing

17:30Targeted fix prompt

"The timeout test is failing because the pool size is 5 but we're spawning 10 concurrent requests. Fix the test setup."

18:30All tests passing

15/15 tests passing after fixing test setup and adding error path coverage

20:00Final review🎯 Hiring Signal

Re-read all changes, ran tests one more time, verified no regressions

22:14Submitted

Completed 8 minutes under the 30-minute limit

Strengths

  • Thorough exploration before acting — read 4 files before first prompt
  • Caught AI hallucination (double-free bug) and corrected independently
  • Consistent test-driven verification after every change
  • Efficient time management — completed 8 min early

Areas to Improve

  • Some AI prompts could be more specific with constraints
  • Could have added more edge case tests for connection timeout scenarios

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