Hubspot Software Engineer Interview Questions
HubSpot Software Engineer interview questions emphasize practical problem solving, readable code, and collaborative thinking more than trick puzzles. Expect a mix of an asynchronous coding challenge, a recruiter/behavioral conversation, and one or more technical interviews that focus on algorithmic problems (often easy-to-medium LeetCode style), code correctness, edge-case handling, and for senior roles, system design. HubSpot is explicit about avoiding brainteasers; interviewers want to see how you approach real engineering problems, communicate tradeoffs, and fit with the company’s Culture Code. For interview preparation, practice clear verbalization of your thought process and rigorous testing of edge cases, and be ready to write production-quality code with attention to complexity and readability. Use your own laptop if possible and practice solving problems while explaining each step, since HubSpot encourages working in a comfortable environment and allows use of resources like documentation. Also prepare STAR-style stories that show ownership, collaboration, and impact, and review basic system-design patterns if you’re applying at mid-to-senior levels.
Design an hourly weather crawling service
Scenario Design a service that crawls the U.S. National Weather Service (or a similar public provider) and provides hourly weather data to internal co...
Design a Netflix-like video platform
Scenario Design a Netflix-like platform that supports: - Search for videos (by title, tags, people, etc.) - Stream videos to web/mobile/TV clients - U...
Design a near-real-time weather API
System Design: Weather Data Platform (Onsite) Context and Assumptions - You are designing a service that pulls best-effort hourly weather data from an...
Design a streaming video platform MVP
System Design: Streaming Video Platform MVP Context Design a Netflix‑like MVP that serves consumer video-on‑demand. Assume: - Global audience, single ...
Implement Python LRU cache with varargs
Implement an LRU cache in Python as a decorator cache(maxsize) that memoizes a target function's results. Must support positional args, args, and *kwa...
Design Netflix-like MVP: browse, play, resume
Design a Netflix-like MVP (System Design) Context You are designing an MVP video streaming platform that supports browsing content, playing videos on ...
Find a special person using knows(a,b)
Problem You are given n people labeled 0 to n-1 at a party. You can call an API: - knows(a, b) -> bool: returns true if person a knows person b, other...
Design a weather aggregation system
System Design: Weather Data Aggregation (10-minute Updates) Context Build a service that periodically fetches weather data from third-party providers ...
Design a GPU inference API
System Design: GPU-Backed Inference Platform and API You are designing a production inference platform to serve deep learning models (vision, ranking,...
Find the spammer using hasMessaged
You are given n accounts labeled 0..n-1 and an API boolean hasMessaged(a, b) that returns true if account a has sent a message to account b, and false...
Schedule and execute future payments
System Design: Scheduled Payments Execution Context You are building a balance-transfer service (e.g., an internal wallet). Users can schedule a payme...
Design and implement a bank account system
Design and implement a minimal banking service with the following capabilities: 1) Create bank accounts with unique IDs and an initial balance; suppor...
Implement a same-host web crawler
Implement a web crawler that, given a starting URL and an interface get_links(url) -> Iterable[str], discovers all pages under the same hostname. Requ...
Design a Netflix-like streaming platform
System Design: Netflix‑Like Video Streaming Platform Context Design a large-scale video streaming platform that supports web, mobile, and TV clients f...
Design weather API with freshness guarantees
System Design: Weather API with 10-Minute Freshness SLA Context You are designing a service that exposes a public HTTP API to return the current tempe...
Implement account CRUD and transfer
Design and Implement Money Movement APIs Context You are building a small money-movement service for a single currency. The system must support creati...
Describe handling AI safety concerns
AI Safety Risk: Identify, Assess, Mitigate, and Monitor Context Behavioral & leadership onsite prompt for a Software Engineer working on AI features. ...
Design a bank with scheduled payments and merges
Design an in-memory banking service that supports the following operations: ( 1) CreateAccount(accountId), ( 2) Deposit(accountId, amount), ( 3) Trans...
Design file deduplication at scale
Design an algorithm to identify duplicate files in a large directory tree. You are given an iterator over files providing (path, size) and a function ...
Find spammer with minimal hasMessaged calls
You have n accounts labeled 0..n-1 and an oracle hasMessaged(a, b) that returns true if account a has sent at least one message to account b. Define a...