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Companies/Jane Street

Jane Street

mixed difficulty36 questions

Quant + ML research engineering roles.

Curated

36questions

Difficulty

mixed

Primary focus

quant_ml

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Top 10 most asked style questions

Free

01
What is the goal and risk of injecting noise into pre-softmax attention scores?
Multiple ChoiceMedium
02
What's the practical tradeoff between learned and sinusoidal positional embeddings?
Multiple ChoiceMedium
03
Explain precisely why a chatbot with persistent memory is not an agent
Short AnswerMedium
04
What slice level eval reveals about an 85% faithful RAG system suspected to fail on multi-hop queries
Predict OutputHard
05
Which of the following are components of a production grade prompt beyond 'just instructions'?
Multi-selectMedium
06
When would you need the offset_mapping feature that HuggingFace fast tokenizers provide?
Short AnswerMedium
07
What is the LLM's behavior when a malicious server shadows a trusted tool without host namespacing
Predict OutputHard
08
You're enabling response_format=json_object (OpenAI) or strict structured output (Anthropic). What's the tradeoff vs prompting for JSON in prose?
Multiple ChoiceMedium
09
Why does dropping the EOS token from SFT labels produce a model that never stops generating?
FlashcardEasy
10
Estimate the worker pool a summarization queue needs using Little's Law
Predict OutputMedium

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26 more curated Jane Street questions: mixed formats, calibrated difficulty.

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Typical roles

·ml_engineer

·quant_researcher

·software_engineer

Top asked skills

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