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Comcast Software Engineer Interview Questions

The questions to prepare for a Comcast Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

50questions
~7htotal time
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1
CodingStart here. 20 questions · ~168 min
Reverse a String in PythonEasy
Practice

Reverse a string in Python using character traversal and return the reversed result.

StringsfunctionspythonComcast
Binary Search and Tree TraversalMedium

Tests core data structure and algorithm knowledge with correct traversal or search logic.

binary searchTreesComcast
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2
SQL & Data Manipulation10 questions + 3 drills · ~114 min
UNION vs UNION ALL UsageEasy

Explain how UNION and UNION ALL differ when combining result sets, especially around duplicate handling and performance.

Data WranglingperformanceUnionsComcast
Optimizing Slow SQL QueriesMedium

Tests skills in SQL performance tuning using indexing, query plans, and query rewrites.

Performance Tuningquery optimizationsqlComcast
Second Highest Trader SalaryEasy
Practice
Practice drill

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

SubqueriesRankingSortingeClinicalWorksInformaticaSpectraforce Technologies
7-Day Rolling Active UsersMedium
Practice
Practice drill

Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.

Window FunctionsDate FunctionsRunning TotalsMetaSpotifyMeta IT
SQL Bookstore Schema PracticeEasy
Practice
Practice drill

Use a CTE, joins, and distinct aggregates to calculate Meta Logistics bookstore payment metrics.

sql queriessqlpythonMeta Logistics
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3
System Design8 questions · ~67 min
Concurrency for High-Traffic AppsHard

Tests ability to design for performance and correctness under concurrent load.

threadingconcurrencyComcast
Project Architecture WalkthroughMedium

Tests ability to explain system architecture decisions, tradeoffs, and component interactions.

project experiencesystem designarchitectureComcast
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4
Execution3 questions · ~25 min
Root Cause Production IssuesMedium

Tests incident troubleshooting approach using logs, metrics, and structured debugging.

root cause analysisproduction issuesProblem SolvingComcast
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5
Security & Infrastructure3 questions · ~25 min
TCP vs UDP Use CasesMedium

Assesses understanding of transport-layer trade-offs and correct protocol selection.

Comcast
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6
Behavioral & Leadership6 questions · ~50 min
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The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.