Cohere

A recruiter call, a hiring manager conversation and production-minded coding rounds, then enterprise-flavored ML and system design, a behavioral round and a team match; four to seven weeks overall.

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  Design an enterprise research agent with internal and web sources and citationsAI systemAn employee asks a hard research question. Design the assistant that answers it by searching both the company's own systems (documents, wikis, a CRM such as Salesforce) and the…

  Last asked Oct 2026Were you asked this too?
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  Credit card form with validation and linked fieldsCodingBuild a card-details form in the browser (React is fine): cardholder name, card number, expiry date and security code. Validate each field as the user types and on submit, and…

  Last asked Sep 2026Were you asked this too?
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  Design a real-time comment feed with optimistic updatesSystem designDesign the front end of a comment section where other people's comments arrive live and the viewer can post their own. The focus is optimistic posting: a submitted comment shows…

  Last asked Sep 2026Were you asked this too?
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  Greedy, top-k and top-p decoding for a language modelCodingYou get a toy language model with a small vocabulary whose forward pass returns next-token logits for the tokens so far. Using NumPy, write the generation loop and three ways to…

  Last asked Sep 2026Were you asked this too?
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  Load daily LLM chat logs into a warehouse idempotentlySystem designEvery day one JSONL file of LLM conversations lands in object storage; each line is a conversation with an id, a user id, its messages and metadata. Design the job that loads it…

  Last asked Sep 2026Were you asked this too?
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  Replace a text game's heuristic logic with LLM callsCodingYou are handed a text game that runs in the terminal, with a few hundred lines of Python that make its decisions through hand-written rules. In a live session, swap that…

  Last asked Sep 2026Were you asked this too?
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  Defend your own research paper under hard questionsML designYou present one of your published papers to an interviewer who has already read it and may skip your slides to go straight at its weak spots. Be ready to say whether the…

  Last asked Sep 2026Were you asked this too?
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  Delete one '5' from a digit string to get the largest numberCodingYou get a string of decimal digits that contains at least one '5'. Remove exactly one of the '5' characters so that the number left is as large as possible, and return that…

  Last asked Sep 2026Were you asked this too?
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  Make an LLM recognize questions past its training cutoffML designChat assistants sometimes answer a question about recent events by saying their knowledge stops at a certain date. You are building an LLM: how would you get it to notice that a…

  Last asked Sep 2026Were you asked this too?
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  Post-train a 7B model to code better for one enterpriseML designAn enterprise customer wants a 7-billion-parameter model that writes better code for them. Design the post-training pipeline end to end: collecting and cleaning data, supervised…

  Last asked Sep 2026Were you asked this too?
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  Explain LLM training, reinforcement learning and evaluationML designWalk through how a large language model is trained, from pretraining to fine-tuning, where reinforcement learning comes in after that, and how you evaluate the model at each…

  Last asked Dec 2025Were you asked this too?
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  Improve an LLM's reasoning on a domain taskML designA model reasons poorly on one specialized task. How would you improve it? Compare the options, from prompting and retrieval to fine-tuning and reinforcement learning, say what…

  Last asked Dec 2025Were you asked this too?
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  Design a RAG system over company docsAI systemEmployees should be able to ask questions about internal documents (Drive, Confluence, Slack, GitHub) and get grounded answers with citations.

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