Cresta interview questions

Showing 1–10 of 10 results

• Build a Tool-Calling Chat Agent That Searches and Books Flights via a REST APIMedium

  An AI-assisted coding round: turn a Python starter script into a terminal chat agent that uses LLM tool calling to search flights, save passenger details and book a flight through a three-endpoint REST API. It tests tool schemas, a multi-step tool loop, ID handling, booking safeguards and error handling.

  CrestaSoftware EngineerSoftware Engineering FundamentalsOnsite
• Count the Leaves Left on a Grid After a Sequence of Wind GustsMedium

  Simulate wind gusts over a grid in which every cell holds a number of leaves: each gust shifts all leaves one cell in its direction, and leaves pushed off the edge are lost for good. Return how many leaves remain, testing careful two-dimensional state updates and boundary handling under time pressure.

  CrestaSoftware EngineerCoding & AlgorithmsOnline Assessment
• Design a Robust Feature Flag Evaluation EngineMedium

  Implement an in-memory feature flag evaluation engine that evaluates flags against user attributes using rule predicates, deterministic percentage rollouts, and a true-wins resolution policy.

  CrestaSoftware EngineerSoftware Engineering FundamentalsOnsite
• Design an Evaluation Platform for AI Agents Across Prompt and Model ChangesMedium

  An ML system design question about a platform that lets teams evaluate AI agents and measure how a change of system prompt or model affects quality, tool use and response speed. It tests evaluation design, scoring with references and LLM judges, statistical comparison of versions and scalable execution.

  CrestaSoftware EngineerML System DesignOnsite
• Design sequence decoding with greedy and beam searchMedium

  This interview question evaluates core ML concepts, assumptions, math intuition, training/evaluation trade-offs, and practical failure modes in a realistic interview setting. A strong answer for Design sequence decoding with greedy and beam search states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  CrestaSoftware EngineerMachine LearningTechnical Screen
• Job Dispatcher with Least-Loaded, Round-Robin Assignment and Executor RemovalMedium

  A coding exercise to implement Executor and JobDispatcher classes that send each integer job ID to the executor with the fewest pending jobs, breaking ties round-robin, while executors join and leave. It tests precise tie-break semantics, consistent load tracking, reassigning a removed executor's queued jobs, and edge cases.

  CrestaSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Longest Overlap Between the End of One String and the Start of AnotherMedium

  Given two strings, return the length of the longest suffix of the first string that is also a prefix of the second. The problem tests precise string indexing, the direction of the overlap, and boundary cases such as no overlap at all or an overlap covering the whole shorter string.

  CrestaSoftware EngineerCoding & AlgorithmsOnline Assessment
• Productionize a Successful Proof of ConceptEasy

  Explain how to take a successful proof of concept into production, including the engineering and operational gaps that must be closed.

  CrestaSoftware EngineerSystem DesignTechnical Screen
• Recorded Walkthrough of a Past AI Project and Your Own Role in ItMedium

  A recorded behavioral item from a timed online assessment for a forward-deployed AI engineering role: walk through an AI project you built and explain exactly which parts you owned. It tests concise technical storytelling, clear ownership, evaluation and outcomes without a live interviewer to prompt you.

  CrestaSoftware EngineerBehavioral & LeadershipOnline Assessment
• Search a Directory Tree for a File and Return Its Absolute Path in PythonMedium

  Write a Python function that searches a directory and all of its subdirectories for a file matching a requirement and returns the file's absolute path. It tests practical use of os and pathlib, deterministic handling of multiple or missing matches, relative roots, symbolic links and unreadable directories.

  CrestaSoftware EngineerSoftware Engineering FundamentalsOnline Assessment