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Lumen Software Engineer Interview Questions

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

50questions
~8htotal time
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1
CodingStart here. 19 questions · ~172 min
Linked List ReversalEasy
Practice

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysLumen
Find Two Sum IndicesEasy
Practice

Use a hash map to find two array elements that sum to a target in O(n) time.

Hash TablesArraysSortingLumen
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2
System Design5 questions · ~45 min
Designing User Session ManagementHard

Tests system design for session lifecycle, security, scalability, and reliability in production.

system designuser managementLumen
Design Highly Available Fault Tolerant SystemsHard

Evaluates system design for availability, resilience, and operational reliability.

high availabilityfault toleranceLumen
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3
SQL & Data Manipulation5 questions + 3 drills · ~75 min
DDL, DML, TCL and OOPMedium

Evaluates database fundamentals and understanding of core OOP concepts.

Lumen
SQL JoinsMedium

Assesses SQL join knowledge and ability to reason about result sets.

JoinssqlLumen
Analyze Customer Purchase Trends with Window FunctionsEasy
Practice
Practice drill

Calculate the monthly spending trends for customers using window functions and joins.

The Home DepotAvisoWorld Wide Technology
SQL Queries for RankingMedium
Practice
Practice drill

Rank active HSBC employees by division and return every employee tied for the highest or second-highest salary.

javasqlHsbc
Top Earners via Table JoinMedium
Practice
Practice drill

Rank Motorola Solutions employees by total earnings using a LEFT JOIN, aggregation, COALESCE, and ROW_NUMBER.

JoinssqlMotorola SolutionsMotorola
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4
Security & Infrastructure3 questions · ~27 min
Networking and Infrastructure BasicsMedium

Assesses foundational networking knowledge relevant to Lumen's connectivity domain.

NetworkingLumen
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5
Behavioral & Leadership16 questions · ~145 min
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6
More topics2 questions · ~18 min
Project Requirements to DeliveryMedium

Evaluates end-to-end execution thinking from requirements through delivery.

Project ManagementLumen
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The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.