Dataford
Dataford
Top 50
Prep plan
Updated weekly · Last refresh Oct 17

Delta Air Lines Software Engineer Interview Questions

The questions to prepare for a Delta Air Lines Software Engineer interview. Questions from real interview reports rank first. Updated daily.

50questions
~9htotal time
Track your progressSign up free to work through all 50 questions and resume where you left off.
Start practicing free →
1
CodingStart here. 19 questions · ~203 min
Write Function and Test CaseEasy
Practice

Implement a small even-number function and validate it with boundary-focused unit tests.

Codingeven numbersBasic AlgorithmsDelta Air Lines
Two-Sum Like ChallengeMedium
Practice

Return every value pair summing to a target, including repeated occurrence pairs, using frequency counting.

ArraysArray ManipulationAlgorithmsDelta Air Lines
More Coding questions with a free account
2
System Design9 questions · ~96 min
Design a Practo-like AppHard

Design Practo-like provider discovery with retrieval, ranking, booking-aware recommendations, and safe fallback behavior.

ML Rankingbooking logicdesignDelta Air Lines
Scalable Flight Status UpdatesHard
Recently asked

Evaluates system design skills for high-throughput, low-latency event processing at Delta Air Lines scale.

scalabilityreal-time systemsDelta Air Lines
More System Design questions with a free account

Sign up to see every question

Create a free account to unlock this list and practice real interview questions.

Get my prep plan
3
Security & Infrastructure3 questions · ~32 min
Find Active Processes on UnixMedium
Recently asked

Evaluates ability to use UNIX tooling to inspect running processes for troubleshooting and operations.

Delta Air Lines
Access a Server Using a JumphostMedium
Recently asked

Assesses practical security and infrastructure knowledge for controlled remote access.

NetworkingDelta Air Lines
More Security & Infrastructure questions with a free account
4
SQL & Data Manipulation7 questions + 3 drills · ~105 min
LinkedList vs ArrayListMedium
Recently asked

Tests knowledge of Java collection trade-offs and performance characteristics.

sql queriesData StructuresDelta Air Lines
SQL Window Functions for TrendsMedium
Practice
Practice drill

Rank Delta Air Lines routes by monthly revenue using joins, aggregation, and a window function.

Window FunctionsLag/LeadJoinsDelta Air Lines
Top Routes by DelayMedium
Practice
Practice drill

Use joins, date filtering, aggregation, and ROW_NUMBER to find Delta's three most delayed routes last quarter.

Window FunctionsDate FunctionsAggregationsDelta Air Lines
Unique Elements and Top-K FrequenciesMedium
Practice
Practice drill

Return the first row for each unique value, then rank the k most frequent values.

large datasetsData Structurescomplex queriesEverlaw
More SQL & Data Manipulation questions with a free account
5
Execution3 questions · ~32 min
Delta Fleet Model Decision CriteriaMedium
Recently asked

Evaluates structured decision-making using technical and operational criteria relevant to Delta Air Lines.

Decision MakingModel EvaluationDelta Air Lines
More Execution questions with a free account
6
Behavioral & Leadership9 questions · ~96 min
More Behavioral & Leadership questions with a free account
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.