CoreWeave

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C
Design a strongly consistent store for fleet validation resultsSystem designTwo internal services share a database: one validates the operating system on every machine in a large fleet and writes the outcome per machine, and the other reads those outcomes…
Last asked Oct 2026
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Design a notification systemSystem designA shared service other teams call to send push, email and SMS notifications: templates, user preferences, retries, deduplication and rate limits.
Last asked Sep 2026
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Why build it in-house instead of adopting an existing tool?BehavioralYou walk the hiring manager through a project where your team wrote its own system. They challenge you: tools that do this already exist, so why not use one? A good answer uses…
Last asked Sep 2026
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Run a function on several threads and inspect them on LinuxCodingYou are given a function and asked to call it on several threads at once using only the basic thread primitives of your language (no thread or process pools, no asyncio). Start…
Last asked Sep 2026
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Concurrent Python CLI that queries a local serviceCodingWrite a Python command-line tool that looks things up in a service running locally over HTTP, keyed by serial number. 1. Take a list of serial numbers and call the service for…
Last asked Sep 2026
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Design a system that distributes work to human workersSystem designDesign a service that hands out workflow tasks to people who complete them by hand: tasks come in, get assigned to available workers, and are tracked until done. Cover how tasks…
Last asked Jul 2026
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Design a website monitoring serviceSystem designDesign a service that keeps checking whether a set of websites are up and responding, records the results over time and alerts the owners when a site goes down. Cover how checks…
Last asked Jul 2026
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Represent and evaluate boolean predicate expressionsCodingDesign data structures for boolean predicates, simple conditions combined with AND, OR and NOT, and write the code that evaluates a predicate against an input to true or false.
Last asked Jul 2026
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Tree class with depth-first and breadth-first operationsOO designDesign a tree class and implement its operations, some by depth-first and some by breadth-first traversal, and explain which traversal suits each operation and why.
Last asked Jul 2026
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Troubleshoot a Kubernetes pod stuck in PendingSystem designA pod on a Kubernetes cluster never leaves the Pending state. Walk through how you find out why and how you fix it. A good answer goes step by step from what the cluster tells you…
Last asked Jul 2026
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Design batched reboots across a machine fleetSystem designDesign a system that reboots a large set of machines in batches rather than all at once. Cover how batches are chosen and sized, how you confirm each machine came back healthy…
Last asked Feb 2026
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Query machines from an API and mark them offlineCodingWrite code against an HTTP API for a machine inventory: fetch the machines, pick out the ones that should be taken out of service, and call the API to mark each of them offline…
Last asked Feb 2026
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Feature flags across channels with inheritanceCodingBuild a feature flag store organized by channels. Each channel has an id, its own map of flag names to true or false, and zero or more parent channels. Looking up a flag on a…
Last asked Jan 2026
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Token-authenticated client that pulls, transforms and stores dataCodingWrite a small program from scratch, one step at a time: 1. Get an access token through an OAuth flow. 2. Use the token to call a remote endpoint (an old database's API) and fetch…
Last asked Oct 2025
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Design a Kubernetes platform that runs and autoscales user appsSystem designDesign a platform on Kubernetes where users upload their application runtimes and the platform runs them, scaling each one up and down with the load it receives. Cover how an…
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