Hudson River Trading interview questions

Showing 31–55 of 55 results

• Explain and Diagnose a Segmentation FaultMedium

  This question tests your understanding of virtual memory, the lifecycle of a segmentation fault, and your ability to diagnose memory corruption using standard tooling.

  Hudson River TradingSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Final Grid Position Under Timestamped Direction Changes With Dot ObstaclesHard

  An object on a grid changes direction whenever a timestamped action arrives and moves one cell per time unit until a blocked cell or the grid edge stops it. The task asks for its cell at a given end time, testing precise reading of the rules, including that dot cells are obstacles, and efficient handling of very large timestamps.

  Hudson River TradingSoftware EngineerCoding & AlgorithmsTechnical Screen
• Find a Local Minimum in One and Two DimensionsHard

  Tests divide-and-conquer optimization techniques to locate a local minimum in 1D and 2D arrays in sublinear time, requiring rigorous reasoning about termination and invariants.

  Hudson River TradingSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Find the Longest Common Digit Prefix Across Two ArraysMedium

  Tests candidate's ability to efficiently match string/digit prefixes between two collections of integers using hash sets or a prefix tree (Trie).

  Hudson River TradingSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Format an Integer with Thousands SeparatorsMedium

  Implement a function that formats a signed integer with a custom thousands separator character without relying on built-in string formatting utilities.

  Hudson River TradingSoftware EngineerCoding & AlgorithmsTechnical Screen
• Implement Buffer Parsers and Generic Map ClassMedium

  This problem tests your ability to safely parse binary data streams from raw memory buffers and implement a type-safe generic wrapper around standard associative containers.

  Hudson River TradingQuantitative ResearcherCoding & AlgorithmsOnline Assessment
• Implement Order Modification FeatureHard

  This question evaluates a software engineering competency in modifying and extending a C++ client/server trading system, focusing on state management, input validation, API integration, and maintaining invariants for order lifecycle.

  Hudson River TradingSoftware EngineerCoding & AlgorithmsOnsite
• Linux Host and Filesystem FundamentalsMedium

  Review practical Linux fundamentals: memory and swap interpretation, safe directory enumeration, process-versus-thread trade-offs, filesystem links, and option-safe file deletion. Also explain responsible recovery steps after an accidental recursive delete.

  Hudson River TradingSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Maximize Item Counts Under Suffix Budget QueriesEasy

  Determine the maximum number of items that can be purchased from a suffix of an item array within a given budget for multiple independent queries.

  Hudson River TradingSoftware EngineerCoding & AlgorithmsHR Screen
• Minimize Array Amplitude After Removing a Contiguous BlockMedium

  Tests array manipulation and prefix/suffix extremum tracking to minimize the spread (max - min) of an array after removing a contiguous subarray of length k.

  Hudson River TradingSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Python Language and Runtime FundamentalsMedium

  Review core Python semantics through decorators, dictionary hashing, generators, unpacking syntax, and memory management. Distinguish language guarantees from CPython behavior while connecting edge cases to API design, debugging, and safe resource cleanup.

  Hudson River TradingSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Query Order and Batch Lifetimes from Event FilesMedium

  Design an event-driven tracker to query lifetimes for individual orders or order batches, correctly handling open orders and aggregate start/end timestamps.

  Hudson River TradingSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Reason About C++ Inlining, Allocation, and PolymorphismHard

  Tests deep C++ systems knowledge regarding the runtime and compiler-level impacts of dynamic dispatch, heap allocations, and function inlining within latency-sensitive pipelines.

  Hudson River TradingSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Reason About Unix Signals, Zombies, and Process ReapingMedium

  Assess understanding of Unix process lifecycles, signal handling mechanics, zombie state accumulation, and process reaping responsibilities in parent processes and PID 1.

  Hudson River TradingSite Reliability EngineerSoftware Engineering FundamentalsTechnical Screen
• Return the K Smallest IntegersMedium

  Implement an algorithm to extract the k smallest integers from an unsorted list in ascending order, preserving duplicates, and analyze the trade-offs between sorting, heaps, quickselect, and bounded-range approaches.

  Hudson River TradingSoftware EngineerCoding & AlgorithmsTechnical Screen
• Simulate Alternating Stick Collection for a NestMedium

  Tests simulation logic, two-pointer state management, turn alternation, and handling conditional decision rules with edge cases.

  Hudson River TradingSoftware EngineerCoding & AlgorithmsTechnical Screen
• Simulate Players Moving Under a Watcher's GazeMedium

  Simulate the movement and freezing of players on a 1D track under the gaze of a moving watcher who reverses direction at specified times.

  Hudson River TradingSoftware EngineerCoding & AlgorithmsTechnical Screen
• Smallest Integer Point Lit by the Most Street Lamps on a LineEasy

  Online assessment coding problem: street lamps on a number line each light a closed interval around their position, and you must return the integer point lit by the most lamps, choosing the smallest such point on ties. It tests interval overlap counting over very large coordinate ranges.

  Hudson River TradingSoftware EngineerCoding & AlgorithmsTechnical Screen
• Solve Dice Probability and Matrix QuestionsMedium

  This problem tests probability distributions over modular arithmetic and the identification of properties of doubly stochastic matrices.

  Hudson River TradingData ScientistMachine LearningTechnical Screen
• Solve Watcher Simulation And Integer ConversionMedium

  This question evaluates event-driven simulation and discrete-time state modeling for tracking multiple agents under dynamic visibility constraints, together with low-level numeric string conversion and edge-case handling for 32-bit signed integers.

  Hudson River TradingSoftware EngineerCoding & AlgorithmsTechnical Screen
• Split a Message into Length-Limited Parts with Numbered SuffixesMedium

  This problem tests your ability to handle string manipulation, edge-case arithmetic, and iterative construction while adhering to dynamic length constraints imposed by mandatory metadata.

  Hudson River TradingSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Test easy–medium array/string tasksMedium

  This question evaluates a candidate's ability to design concise, robust test cases and translate edge-case reasoning into concrete inputs and expected outputs for array and string problems, reflecting skills in input validation, correctness assurance, and handling varied data characteristics.

  Hudson River TradingSoftware EngineerCoding & AlgorithmsTechnical Screen
• Troubleshoot a Host That Rejects SSH ConnectionsMedium

  Tests systematic Linux systems and networking troubleshooting methodology by designing an evidence-based diagnostic path for an unreachable or rejecting SSH service.

  Hudson River TradingSite Reliability EngineerSoftware Engineering FundamentalsTechnical Screen
• Why pursue full-stack engineering?Hard

  This question evaluates motivation, problem-selection preferences, cross-functional collaboration, and full-stack thinking as competencies relevant to a Software Engineer, and it falls under the Behavioral & Leadership category.

  Hudson River TradingSoftware EngineerBehavioral & LeadershipTechnical Screen
• Wrap a Fixed-Chunk Stream Reader with Arbitrary-Length ReadsHard

  Implement an arbitrary-length stream reader on top of an underlying reader that only yields data in fixed-size chunks, managing internal buffering and end-of-stream state across successive calls.

  Hudson River TradingSoftware EngineerSoftware Engineering FundamentalsTechnical Screen