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Updated weekly · Last refresh Nov 11

Solarsquare Backend Engineer Interview Questions

The questions to prepare for a Solarsquare Backend Engineer interview. Questions from real interview reports rank first. Updated daily.

14questions
~2htotal time
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1
CodingStart here. 5 questions · ~41 min
Full CRUD REST API in Node.jsHard

Evaluates your ability to design and implement a production-style CRUD REST API with correct JSON handling and status codes.

node.jsSolarsquare
Node.js Input Validation for JSONMedium

Assesses how you prevent invalid or malicious inputs from reaching business logic.

node.jsSolarsquare
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2
System Design3 questions · ~24 min
Update Missing Resource HandlingMedium

Assesses your approach to edge cases and correctness of API behavior.

error handlingapi designresource managementSolarsquare
HTTP Status Codes for OutcomesMedium

Assesses your ability to map application results to correct HTTP responses.

error handlingapi designSolarsquare
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3
More topics6 questions · ~49 min
Production-Ready JSON PayloadsMedium

Evaluates your handling of serialization, validation, and response consistency for JSON APIs.

api designSolarsquare
REST API Security ConsiderationsHard

Tests your knowledge of securing public APIs against common threats and misconfigurations.

best practicesapi securitySolarsquare
MongoDB Schema for Efficient QueriesMedium

Evaluates your ability to design MongoDB schemas that optimize query performance.

query optimizationSolarsquare
Securing Endpoints From VulnerabilitiesHard

Tests your practical security measures for hardening REST endpoints.

vulnerabilitiesendpoint securityapi securitySolarsquare
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL Customer-Specific Error MessagesMedium
Practice
Practice drill

Use customer data and payment error codes to return tailored SQL error messages for failed payment attempts.

error handlingnull handlingJoinsGainwell Technologies
Find Latest Failed Step per PipelineMedium
Practice
Practice drill

Identify transformation errors in Citi workflow runs and return the latest failed step per pipeline.

error handlingdata handlingdata validationCiti
Optimize PostgreSQL Billed Totals QueryMedium
Practice
Practice drill

Optimize a PostgreSQL billing query using selective filtering, pre-aggregation, indexes, and regional ranking.

database optimizationJoinsindexesQuantumBlackDDell Tech LaboratoriesConfluent
The finish line: interview-readyComplete all 14 questions plus 3 hands-on drills to finish this plan.