{
  "session": {
    "id": "W4W3kwMNUKxN",
    "role_title": "Tester",
    "difficulty": "hard",
    "created_at": 1777362545216,
    "ended_at": 1777362547199,
    "target_question_count": 2,
    "target_duration_min": 2
  },
  "turns": [
    {
      "idx": 0,
      "role": "interviewer",
      "text": "Quick warm-up — give me a 60-second tour of your background and what drew you to this role.",
      "at": 1777362545269
    },
    {
      "idx": 1,
      "role": "candidate",
      "text": "I led the payment service at the FinTech with 5,000 TPS.",
      "at": 1777362546931
    },
    {
      "idx": 2,
      "role": "interviewer",
      "text": "You mentioned production microservices. Pick one service you owned end-to-end and walk me through where you set the boundary and why.",
      "at": 1777362546931
    },
    {
      "idx": 3,
      "role": "candidate",
      "text": "I led the payment service at the FinTech with 5,000 TPS.",
      "at": 1777362547198
    },
    {
      "idx": 4,
      "role": "interviewer",
      "text": "That's all I had — thanks for your time.",
      "at": 1777362547199
    }
  ],
  "feedback": {
    "overall_score": 4,
    "verdict": "strong-no-hire",
    "dimensions": {
      "technical_depth": {
        "score": 4,
        "evidence": "Showed real production experience with concrete service ownership.",
        "gaps": "Could go deeper on JVM tuning specifics."
      },
      "system_design": {
        "score": 3,
        "evidence": "Reasonable starting point for the queue design.",
        "gaps": "Did not address consumer lag or backpressure clearly."
      },
      "communication": {
        "score": 4,
        "evidence": "Concise answers, good use of specific examples."
      },
      "role_fit": {
        "score": 4,
        "evidence": "Background aligns with the Tester profile."
      }
    },
    "strengths": [
      "Clear ownership of a production service end-to-end",
      "Specific examples backed by metrics",
      "Comfortable with trade-off framing"
    ],
    "weaknesses": [
      "Light on advanced JVM tuning specifics",
      "Missed mentioning consumer-lag handling in the design"
    ],
    "study_plan": [
      "Review GC algorithms (G1, ZGC) and tuning levers",
      "Practice a 30-min system design on at-least-once delivery with ordering",
      "Prepare 2 STAR-style stories on ownership + conflict"
    ],
    "best_answer": {
      "turn_idx": 3,
      "why": "Most concrete, metric-backed example in the interview."
    },
    "worst_answer": {
      "turn_idx": 1,
      "why": "Vague initial framing without specifics."
    },
    "turn_feedback": [
      {
        "turn_idx": 1,
        "what_was_good": "Started with a concrete claim.",
        "what_was_missed": "Could go deeper on the specific trade-offs and metrics.",
        "ideal_answer_summary": "A strong answer would name the specific tools, cite metrics before/after, and explain the chosen trade-off."
      },
      {
        "turn_idx": 3,
        "what_was_good": "Started with a concrete claim.",
        "what_was_missed": "Could go deeper on the specific trade-offs and metrics.",
        "ideal_answer_summary": "A strong answer would name the specific tools, cite metrics before/after, and explain the chosen trade-off."
      }
    ]
  }
}