What questions are asked in PayPal Data Engineer interviews?

Recent candidates report role-specific technical depth, system design or case prompts, and behavioral STAR questions. "Find the longest substring without repeating characters…" is among frequently reported topics.

Is domain-specific tech mandatory for PayPal Data Engineer?

Strong fundamentals are required; stack depth signals vary by team. Panels often probe production scenarios even when the JD lists it as preferred.

How many rounds are there in PayPal Data Engineer interviews?

Most loops include 3–5 rounds: recruiter screen, technical depth, system or domain panel, and behavioral/hiring-manager. Timelines often run 3–6 weeks.

How difficult is the PayPal Data Engineer interview?

Difficulty is Medium–High. Candidates who practice real questions with AI mocks and follow-up chains outperform passive reading.

What SQL and data topics are asked at PayPal?

Data-heavy tracks report warehousing, ETL, optimization, and modeling questions. Match prep to your specialization and recent candidate reports.

Back to PayPal Data Engineer interview

Interview question

Find the longest substring without repeating characters

Asked in PayPal Data Engineer interviews

Asked by

47% candidates

Difficulty

Medium

Round

Technical Round

AI synthesized from candidate reports

Back to Questions

Question 3 of 5

Find the longest substring without repeating characters

Medium57% Candidate ReportsCODINGPayPalData Engineer

Question

Find the longest substring without repeating characters

High-Level Approach

Two pointers + map; update start when duplicate seen.