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Unknowns Full Stack Engineer Interview Questions

The questions to prepare for a Unknowns Full Stack Engineer interview. Questions from real interview reports rank first. Updated daily.

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1
Technical FundamentalsStart here. 7 questions · ~61 min
What Is Rest API, Differences Between Rest and Rest APIsMedium

Evaluates understanding of RESTful APIs and terminology.

restapi designUnknowns
Explain the Difference Between REST and REST APIsMedium

Assesses understanding of REST concepts and API design.

restapi designUnknowns
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2
More topics8 questions · ~69 min
Describe Your Process for Handling Case-Based Scenarios During a System BuildMedium

Evaluates problem solving and design reasoning in build contexts.

system designUnknowns
Explain What You Did in Your Automation Assignment with PuppeteerMedium

Evaluates Puppeteer automation approach and outcomes.

web testingAutomationUnknowns
What Indexing MeansMedium

Assesses your understanding of database indexing and its impact on query performance.

indexingdatabasesUnknowns
Synchronous vs AsynchronousMedium

Tests ability to reason about concurrency, execution flow, and when to use async patterns.

RecursionQueueUnknowns
Approach to Writing Automation Tests for a WebsiteMedium

Tests test strategy, tooling choices, and coverage considerations.

web testingUnknowns
Indexing and Database PerformanceMedium

Evaluates how indexing impacts query speed, storage, and write performance.

indexingsqlUnknowns
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Second Highest Trader SalaryEasy
Practice
Practice drill

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingeClinicalWorksNNeenOpal CanadaInformatica
Extract CME Prices at Least 100Easy
Practice
Practice drill

Extract qualifying market observations by venue and price, then return them in chronological order.

JoinsData ManipulationGroup ByEquifaxDPR ConstructionRigUp
SQL Query for Customer DataEasy
Practice
Practice drill

Extract selected customer fields from Unknowns' customer table and return them in customer ID order.

JoinsData Wranglingdatabase queryingUnknowns
The finish line: interview-readyComplete all 15 questions plus 3 hands-on drills to finish this plan.