Design Candidate Search And LLM Evaluation Tasks

Quick Overview

Prepare for an MLE system design interview that combines candidate search, ranking, comparator reliability, and language-model fundamentals. The prompt covers retrieval, ranking feedback loops, top-k reasoning, transformer concepts, and decoding trade-offs without requiring proprietary hiring data.

Design Candidate Search And LLM Evaluation Tasks

Company: Mercor

Role: Machine Learning Engineer

Category: ML System Design

Difficulty: medium

Interview Round: Onsite

Prepare for an MLE onsite with three themes: finding top candidates from a job description, reasoning about an unreliable deterministic comparator, and implementing or discussing an autoregressive language model trained on a small text corpus. The system design focus is candidate search; the ML follow-ups include transformer architecture, normalization, self-attention, positional embeddings, and decoding strategies such as greedy, beam search, top-k, and top-p. ```hint Hint 1 Start by naming the core entities, constraints, and success criteria. ``` ```hint Hint 2 Make the trade-offs explicit before going deep on implementation details. ``` ### Constraints & Assumptions - The candidate search system should match job descriptions to candidate profiles. - The comparator question is conceptual and asks about reducing calls and wall-clock time. - The LLM mini-project is small-scale and should run end to end. - Do not assume proprietary hiring data or hidden labels. ### Clarifying Questions to Ask - What candidate data is available? - What labels or feedback can train the ranking system? - Should search prioritize recall, precision, fairness, or recruiter efficiency? - What does the comparator compare and how are errors detected? - What model size and training budget are expected for the LLM mini-project? ### What a Strong Answer Covers ```premium-lock What a Strong Answer Covers ``` ### Follow-up Questions - How would you evaluate candidate search offline and online? - How would you reduce wall-clock time when each comparison takes five seconds? - How would you debug an LLM that memorizes the training text? - When would top-p decoding be preferable to beam search?

Overview: Prepare for an MLE system design interview that combines candidate search, ranking, comparator reliability, and language-model fundamentals. The prompt covers retrieval, ranking feedback loops, top-k reasoning, transformer concepts, and decoding trade-offs without requiring proprietary hiring data.

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Mercor
Apr 21, 2026
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Prepare for an MLE onsite with three themes: finding top candidates from a job description, reasoning about an unreliable deterministic comparator, and implementing or discussing an autoregressive language model trained on a small text corpus. The system design focus is candidate search; the ML follow-ups include transformer architecture, normalization, self-attention, positional embeddings, and decoding strategies such as greedy, beam search, top-k, and top-p.

Constraints & Assumptions

  • The candidate search system should match job descriptions to candidate profiles.
  • The comparator question is conceptual and asks about reducing calls and wall-clock time.
  • The LLM mini-project is small-scale and should run end to end.
  • Do not assume proprietary hiring data or hidden labels.

Clarifying Questions to Ask Guidance

  • What candidate data is available?
  • What labels or feedback can train the ranking system?
  • Should search prioritize recall, precision, fairness, or recruiter efficiency?
  • What does the comparator compare and how are errors detected?
  • What model size and training budget are expected for the LLM mini-project?

What a Strong Answer Covers Premium

Follow-up Questions Guidance

  • How would you evaluate candidate search offline and online?
  • How would you reduce wall-clock time when each comparison takes five seconds?
  • How would you debug an LLM that memorizes the training text?
  • When would top-p decoding be preferable to beam search?

Submit Your Answer to Earn 20XP

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