Software Engineer Data Manipulation (SQL/Python) Interview Questions
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Print the K-th non-empty line
Given a large UTF-8 text file, write a program that prints the K-th non-empty line. Do not load the whole file into memory. Specify how you handle fil...
Implement paginated API ingestion
You are given a REST endpoint GET /orders?page=1&limit=100 that returns JSON objects of the form { "page": n, "per_page": m, "total_pages": T, "data":...
Parse and build binary data in Python
Using provided interfaces ByteReader(read(n), read_uint32_le, read_string) and ByteWriter(write(b), write_uint32_le, write_string), implement function...
Implement scalable word count locally
Write a function that reads a very large text file and outputs the frequency of each word. Define your tokenization and normalization rules (case fold...
Fetch and parse JSON from REST API
Set up a minimal development environment and write code that performs an HTTP GET to a given REST endpoint returning JSON. Parse the response and extr...
Implement a nested object validator
Implement a helper function validate(object, required_style) that checks whether a possibly nested object matches a provided schema. The object may co...
Review a geospatial Python module
You receive a Python module that processes geospatial datasets (CSV/GeoJSON) to compute distances, cluster nearby points, and write summaries. Perform...
Fetch and process JSON from REST API
Given a REST endpoint that returns a JSON payload, set up a coding environment, perform an HTTP GET, parse the JSON, and extract specified fields to p...
Explain Python lists, dicts, and concurrency
Explain the differences between Python lists and dictionaries (maps), including common operations and their average time complexity, iteration order g...
Identify false MySQL foreign key statement
MySQL: Which of the following statements is false? A) A column might have a foreign key reference to itself. B) MySQL supports foreign key references ...
Parse a deeply nested JSON
Given a JSON document with approximately five levels of nesting, write code to traverse it and extract specified fields while handling missing keys, a...
Set up a Python interview environment
You can use AI coding tools. Prepare a clean laptop for a Python-based onsite and explain your steps: ( 1) Install pyenv and set up a project-specific...
Compute delivery metrics and top-K queries
You have restaurant menus and orders for a food delivery platform. Part 1: Given a user location and a set of restaurants (each with its menu items an...
Implement a Python test harness
Implement a Python-based test harness for graphics validation. Discuss design of fixtures, parametrization, dependency injection, logging, retries, an...
Compute unique visitors per department from clicks
Given tables Products(product_id, department, category, subcategory) where department > category > subcategory form a hierarchy, and ClickLog(user_id,...
Find users with multi-country successful logins
Given a table login_attempts with columns: user_id (TEXT), timestamp (TIMESTAMP), status (TEXT), and country (TEXT), write an SQL query to return the ...
Pivot data without date libraries
Transform a tall dataset into a wide, pivoted view without using any date/time libraries. Input: a list of records (date, store_id, metric, value) whe...
Count words in a document robustly
Given a text document, return the number of words under a precise definition. First, state the tokenization rules you will use (e.g., treat contractio...
Discuss Python mutability, copying, and GIL
In Python, explain the differences between mutable and immutable objects and illustrate how they affect function arguments and container behavior. Des...
Analyze and debug Python utilities
You are given a snippet where a Python helper class repeatedly reads from an HTTP response stream and writes output. ( 1) Infer and articulate the hel...