Bloomberg Data Engineer Interview Questions

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Bloomberg

Medium

Data Engineer

Implement classes within an abstract Python framework

You are given an existing Python codebase (~200 lines shown) that defines an abstract base class DataProcessor with abstract methods load(self), trans...

Implement RotatingFileSink in hierarchy

You are given an existing Python 3.10 codebase with an abstract base class RecordSink (from abc import ABC, abstractmethod) that defines open() -> Non...

Other / Miscellaneous

Write PostgreSQL string-manipulation query

You are given a PostgreSQL table clickstream(session_id TEXT, page TEXT, query TEXT, ts TIMESTAMP). The page column contains full URLs like 'https://s...

Data Manipulation (SQL/Python)

Write Postgres string parsing and aggregation query

You are given a PostgreSQL table events(user_id TEXT, raw TEXT) where raw stores pipe-delimited key=value pairs, for example 'user=U1|country=US|ts=20...

Data Manipulation (SQL/Python)

Sep 6, 2025