Datadog Interview Questions
Practice the exact questions companies are asking right now.
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Implement buffered file writer with concurrency support
You are given a simple file writer class that writes data directly to disk: `cpp class FileWriter { public: // Append data to the file on disk imm...
Build span trees from unordered trace spans
You are given an unordered list of span objects. Each span is a map/dictionary containing at least: - span_id (string, unique) - parent_id (string or ...
Implement Prefix Match Filter
Design a data structure that stores a collection of prefix strings. Then, given a list of input strings, return every string that begins with at least...
Design log-query stream processor
Stream Processor: Query Registration and Log Tagging Context You are designing a streaming component that ingests a single mixed stream of messages. E...
Design log queries and a buffered writer
Part A — Log store with time-range queries: Implement a data structure that ingests log entries with ISO-8601 timestamps (e.g., YYYY-MM-DD HH:MM:SS) a...
Design log queries and a buffered writer
Part A — Log store with time-range queries: Implement a data structure that ingests log entries with ISO-8601 timestamps (e.g., YYYY-MM-DD HH:MM:SS) a...
Explain a project concisely and deeply
Behavioral: Impactful Project — 60–90s Overview + Deep Dive Provide a concise 60–90 second overview of one impactful project you owned or led, then do...
Describe handling conciseness feedback
Behavioral: Conciseness Feedback and Adaptation Provide a real example where you received feedback that your answers were not concise. Address the fol...
Design log queries and a buffered writer
Part A — Log store with time-range queries: Implement a data structure that ingests log entries with ISO-8601 timestamps (e.g., YYYY-MM-DD HH:MM:SS) a...
Design an image detection system
System Design: End-to-End Image Object-Detection Service Context Design a production-grade service that ingests user-uploaded images, runs object dete...
Design log queries and a buffered writer
Part A — Log store with time-range queries: Implement a data structure that ingests log entries with ISO-8601 timestamps (e.g., YYYY-MM-DD HH:MM:SS) a...
Design an image detection system
System Design: Image Object Detection Platform Context Design a multi-tenant system that processes user-uploaded images and returns detected objects w...
Match logs to prior queries
Question You receive a stream of strings, each beginning with either "Q:" (query) or "L:" (log). A query consists of space-separated words and should ...
Design an image detection system
System Design: Image Object Detection Service Design an image detection system that processes user-uploaded images and returns detected objects with b...
Deep-dive a recent project
Project Deep-Dive (Technical Screen: Behavioral & Leadership) Context You will be asked to walk through a recent project you owned end-to-end. Assume ...
Design an image detection system
Image Object Detection System — Requirements and End-to-End Architecture Context Design a production system that accepts user-uploaded images and retu...
Deep-dive a recent project
Behavioral Technical Screen: Deep-Dive a Recent Project Provide a deep dive on a recent project you led or significantly contributed to. Aim for a con...
Describe handling conciseness feedback
Behavioral Interview Prompt: Concision in Communication You are interviewing for a software engineering role in a technical screen. Answer the followi...
Design an image detection system
System Design: End-to-End Image Object-Detection Platform Context Design a production system that accepts user-submitted images, detects objects, and ...
Design an image detection system
System Design: Image Object Detection Service Scenario Design an image detection service that accepts user-uploaded images and returns detected object...