Top 29

Prep plan

Updated weekly · Last refresh Oct 17

Delta System & Software Software Engineer Interview Questions

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

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CodingStart here. 5 questions · ~41 min

Optimizing Time and Space ComplexityEasy

Explain how to improve coding solutions by reducing time complexity first, then balancing space trade-offs.

Hash TablesArraysGreedy

Delta System & Software

Inheritance and Its BenefitsMedium

Tests understanding of core OOP concepts and when inheritance is useful.

programming conceptsoop

Delta System & Software

Function, Solution, and Time ComplexityHard

Tests your coding ability and understanding of algorithmic complexity.

Codingtime complexity

Delta System & Software

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SQL & Data Manipulation3 questions + 3 drills · ~54 min

Redesign Slow Production QueriesHard

Tests your ability to diagnose and optimize SQL performance in production systems.

Performance Tuningsql

Delta System & Software

SQL Proficiency and Query OptimizationMedium

Tests SQL depth and your ability to improve performance and correctness of complex queries.

query optimizationsql

Delta System & Software

Scenario-Based Business CaseHard

Practice

Practice drill

Aggregate project outcomes and present a defensible SQL-based business case analysis.

project experienceJoinsbusiness problem

TikTok

Consecutive Login Days SQLHard

Practice

Practice drill

Find each user's longest consecutive login streak by deduplicating login dates and identifying gaps between days.

Date FunctionsData ManipulationProblem Solving

Didi Chuxing

ByteDance

Write SQL for a Specific ProblemMedium

Practice

Practice drill

Calculate each customer's completed 2025 order totals and classify customers by total value.

JoinsCTEsProblem Solving

EPAM Systems

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Execution3 questions · ~24 min

High Availability Backend ArchitectureHard

Tests your design thinking for resilience, failover, and reliable service operation.

system designhigh availability

Delta System & Software

Code Quality and Scalability ToolsMedium

Tests your engineering toolbox for maintainability, testing, and scalable development.

code qualityscalability

Delta System & Software

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Behavioral & Leadership17 questions · ~138 min

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